MySQL高可用方案MHA的配备和规律葡京赌场网址

View Code

                  
<td><%=dateFormat.format(person.getBirthday()) %></td>

葡京赌场网址 1葡京赌场网址 2

<%@ page language=”java” pageEncoding=”UTF-8″%>

#!/usr/bin/env perl

#  Copyright (C) 2011 DeNA Co.,Ltd.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#  Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

## Note: This is a sample script and is not complete. Modify the script based on your environment.

use strict;
use warnings FATAL => 'all';

use Getopt::Long;
use MHA::DBHelper;
use MHA::NodeUtil;
use Time::HiRes qw( sleep gettimeofday tv_interval );
use Data::Dumper;

my $_tstart;
my $_running_interval = 0.1;

my $vip = '192.168.244.188';
my $key = "2";
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip/24";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
my $ssh_send_garp = "/sbin/arping -U $vip -I eth0 -c 1";

my (
  $command,              $orig_master_is_new_slave, $orig_master_host,
  $orig_master_ip,       $orig_master_port,         $orig_master_user,
  $orig_master_password, $orig_master_ssh_user,     $new_master_host,
  $new_master_ip,        $new_master_port,          $new_master_user,
  $new_master_password,  $new_master_ssh_user,
);
GetOptions(
  'command=s'                => \$command,
  'orig_master_is_new_slave' => \$orig_master_is_new_slave,
  'orig_master_host=s'       => \$orig_master_host,
  'orig_master_ip=s'         => \$orig_master_ip,
  'orig_master_port=i'       => \$orig_master_port,
  'orig_master_user=s'       => \$orig_master_user,
  'orig_master_password=s'   => \$orig_master_password,
  'orig_master_ssh_user=s'   => \$orig_master_ssh_user,
  'new_master_host=s'        => \$new_master_host,
  'new_master_ip=s'          => \$new_master_ip,
  'new_master_port=i'        => \$new_master_port,
  'new_master_user=s'        => \$new_master_user,
  'new_master_password=s'    => \$new_master_password,
  'new_master_ssh_user=s'    => \$new_master_ssh_user,
);

exit &main();

sub start_vip(){
    `ssh $new_master_ssh_user\@$new_master_host \" $ssh_start_vip \"`;
    `ssh $new_master_ssh_user\@$new_master_host \" $ssh_send_garp \"`;
}

sub stop_vip(){
    `ssh $orig_master_ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
}


sub current_time_us {
  my ( $sec, $microsec ) = gettimeofday();
  my $curdate = localtime($sec);
  return $curdate . " " . sprintf( "%06d", $microsec );
}

sub sleep_until {
  my $elapsed = tv_interval($_tstart);
  if ( $_running_interval > $elapsed ) {
    sleep( $_running_interval - $elapsed );
  }
}

sub get_threads_util {
  my $dbh                    = shift;
  my $my_connection_id       = shift;
  my $running_time_threshold = shift;
  my $type                   = shift;
  $running_time_threshold = 0 unless ($running_time_threshold);
  $type                   = 0 unless ($type);
  my @threads;

  my $sth = $dbh->prepare("SHOW PROCESSLIST");
  $sth->execute();

  while ( my $ref = $sth->fetchrow_hashref() ) {
    my $id         = $ref->{Id};
    my $user       = $ref->{User};
    my $host       = $ref->{Host};
    my $command    = $ref->{Command};
    my $state      = $ref->{State};
    my $query_time = $ref->{Time};
    my $info       = $ref->{Info};
    $info =~ s/^\s*(.*?)\s*$/$1/ if defined($info);
    next if ( $my_connection_id == $id );
    next if ( defined($query_time) && $query_time < $running_time_threshold );
    next if ( defined($command)    && $command eq "Binlog Dump" );
    next if ( defined($user)       && $user eq "system user" );
    next
      if ( defined($command)
      && $command eq "Sleep"
      && defined($query_time)
      && $query_time >= 1 );

    if ( $type >= 1 ) {
      next if ( defined($command) && $command eq "Sleep" );
      next if ( defined($command) && $command eq "Connect" );
    }

    if ( $type >= 2 ) {
      next if ( defined($info) && $info =~ m/^select/i );
      next if ( defined($info) && $info =~ m/^show/i );
    }

    push @threads, $ref;
  }
  return @threads;
}

sub main {
  if ( $command eq "stop" ) {
    ## Gracefully killing connections on the current master
    # 1. Set read_only= 1 on the new master
    # 2. DROP USER so that no app user can establish new connections
    # 3. Set read_only= 1 on the current master
    # 4. Kill current queries
    # * Any database access failure will result in script die.
    my $exit_code = 1;
    eval {
      ## Setting read_only=1 on the new master (to avoid accident)
      my $new_master_handler = new MHA::DBHelper();

      # args: hostname, port, user, password, raise_error(die_on_error)_or_not
      $new_master_handler->connect( $new_master_ip, $new_master_port,
        $new_master_user, $new_master_password, 1 );
      print current_time_us() . " Set read_only on the new master.. ";
      $new_master_handler->enable_read_only();
      if ( $new_master_handler->is_read_only() ) {
        print "ok.\n";
      }
      else {
        die "Failed!\n";
      }
      $new_master_handler->disconnect();

      # Connecting to the orig master, die if any database error happens
      my $orig_master_handler = new MHA::DBHelper();
      $orig_master_handler->connect( $orig_master_ip, $orig_master_port,
        $orig_master_user, $orig_master_password, 1 );

      ## Drop application user so that nobody can connect. Disabling per-session binlog beforehand
      $orig_master_handler->disable_log_bin_local();
      # print current_time_us() . " Drpping app user on the orig master..\n";
      #drop_app_user($orig_master_handler);

      ## Waiting for N * 100 milliseconds so that current connections can exit
      my $time_until_read_only = 15;
      $_tstart = [gettimeofday];
      my @threads = get_threads_util( $orig_master_handler->{dbh},
        $orig_master_handler->{connection_id} );
      while ( $time_until_read_only > 0 && $#threads >= 0 ) {
        if ( $time_until_read_only % 5 == 0 ) {
          printf
"%s Waiting all running %d threads are disconnected.. (max %d milliseconds)\n",
            current_time_us(), $#threads + 1, $time_until_read_only * 100;
          if ( $#threads < 5 ) {
            print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
              foreach (@threads);
          }
        }
        sleep_until();
        $_tstart = [gettimeofday];
        $time_until_read_only--;
        @threads = get_threads_util( $orig_master_handler->{dbh},
          $orig_master_handler->{connection_id} );
      }

      ## Setting read_only=1 on the current master so that nobody(except SUPER) can write
      print current_time_us() . " Set read_only=1 on the orig master.. ";
      $orig_master_handler->enable_read_only();
      if ( $orig_master_handler->is_read_only() ) {
        print "ok.\n";
      }
      else {
        die "Failed!\n";
      }

      ## Waiting for M * 100 milliseconds so that current update queries can complete
      my $time_until_kill_threads = 5;
      @threads = get_threads_util( $orig_master_handler->{dbh},
        $orig_master_handler->{connection_id} );
      while ( $time_until_kill_threads > 0 && $#threads >= 0 ) {
        if ( $time_until_kill_threads % 5 == 0 ) {
          printf
"%s Waiting all running %d queries are disconnected.. (max %d milliseconds)\n",
            current_time_us(), $#threads + 1, $time_until_kill_threads * 100;
          if ( $#threads < 5 ) {
            print Data::Dumper->new( [$_] )->Indent(0)->Terse(1)->Dump . "\n"
              foreach (@threads);
          }
        }
        sleep_until();
        $_tstart = [gettimeofday];
        $time_until_kill_threads--;
        @threads = get_threads_util( $orig_master_handler->{dbh},
          $orig_master_handler->{connection_id} );
      }

      ## Terminating all threads
      print current_time_us() . " Killing all application threads..\n";
      $orig_master_handler->kill_threads(@threads) if ( $#threads >= 0 );
      print current_time_us() . " done.\n";
      $orig_master_handler->enable_log_bin_local();
      $orig_master_handler->disconnect();

      ## Droping the VIP     
      print "Disabling the VIP an old master: $orig_master_host \n";
      &stop_vip();

      ## After finishing the script, MHA executes FLUSH TABLES WITH READ LOCK
      $exit_code = 0;
    };
    if ($@) {
      warn "Got Error: $@\n";
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "start" ) {
    ## Activating master ip on the new master
    # 1. Create app user with write privileges
    # 2. Moving backup script if needed
    # 3. Register new master's ip to the catalog database

# We don't return error even though activating updatable accounts/ip failed so that we don't interrupt slaves' recovery.
# If exit code is 0 or 10, MHA does not abort
    my $exit_code = 10;
    eval {
      my $new_master_handler = new MHA::DBHelper();

      # args: hostname, port, user, password, raise_error_or_not
      $new_master_handler->connect( $new_master_ip, $new_master_port,
        $new_master_user, $new_master_password, 1 );

      ## Set read_only=0 on the new master
      $new_master_handler->disable_log_bin_local();
      print current_time_us() . " Set read_only=0 on the new master.\n";
      $new_master_handler->disable_read_only();

      ## Creating an app user on the new master
      #print current_time_us() . " Creating app user on the new master..\n";
      # create_app_user($new_master_handler);
      print "Enabling the VIP $vip on the new master: $new_master_host \n";
      &start_vip();
      $new_master_handler->enable_log_bin_local();
      $new_master_handler->disconnect();

      ## Update master ip on the catalog database, etc
      $exit_code = 0;
    };
    if ($@) {
      warn "Got Error: $@\n";
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "status" ) {

    # do nothing
    exit 0;
  }
  else {
    &usage();
    exit 1;
  }
}

sub usage {
  print
"Usage: master_ip_online_change --command=start|stop|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
  die;
}

        }

 

葡京赌场网址 3

        –workdir:钦定创立relay
log的硬链接的岗位,私下认可的是/var/tmp。由于系统不一致分区创造硬链接文件会退步,故必要内定具体的硬链接的职位。

    response.setCharacterEncoding(“UTF-8”);        // 设置request编码

    # ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.244.20

<jsp:directive.page import=”java.text.DateFormat”/>

③ 、配置SSH登录无密码验证

       ssidCookie.set马克斯Age(timeout);                 // 设置有效期

View Code

            // 遍历基础数据,验证账号、密码

    设置log-bin后,重新履行:

图1.1  Baidu网站颁发的Cookie

《深远浅出MySQL》 

    <!– … 中间代码略 –>

     # ip a

    DateFormat dateFormat = newSimpleDateFormat(“yyyy-MM-dd”);        
// 日期格式化器

 

        //重新请求本页面,参数中带有时间戳,禁止浏览器缓存页面内容

    执行完成后,会在/usr/local/bin下增加产量以下多少个公文  

Cookie cookie = new Cookie(“time”, “20080808”); // 新建Cookie

      # perl Makefile.PL  

1.2.2  达成用户登录

View Code

 

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:c6:47:04 brd ff:ff:ff:ff:ff:ff
    inet 192.168.244.10/24 brd 192.168.244.255 scope global eth0
    inet 192.168.244.188/24 scope global secondary eth0
    inet6 fe80::20c:29ff:fec6:4704/64 scope link 
       valid_lft forever preferred_lft forever

<%!                                                  // JSP方法

参考:

        return;

 

<jsp:directive.page import=”java.util.Date”/>

  1. master_ip_failover:管理VIP

  2. master_ip_online_change:

  3. masterha_secondary_check:当MHA
    manager检查和测试到master不可用时,通过masterha_secondary_check脚本来进一步承认,减低误切的高危机。

  4. send_report:当产生故障切换时,可通过send_report脚本发送告警新闻。

    <ahref=”index.jsp;jsessionid=0CCD096E7F8D97B0BE608AFDC3E1931E?c=
    1&wd=Java”>Homepage</a>

env: /etc/init.d/keepalived: Permission denied

       response.addCookie(ssidCookie);            // 输出到客户端

MHA(Master High
Availability)是一套绝对成熟的MySQL高可用方案,能做到在0~30s内自动完毕数据库的故障切换操作,在master服务器不宕机的事态下,基本能保证数据的一致性。

本章将系统地讲述Cookie与Session机制,并比较印证如曾几何时候不能够用库克ie,哪天无法用Session。

 

   

有关MHA的广阔操作,包罗机关Failover,手动Failover,在线切换,可参考另一篇博客:

查看某些网站公布的Cookie很不难。在浏览器地址栏输入javascript:alert (document.
cookie)
就能够了(供给有网才能查看)。JavaScript脚本会弹出二个对话框展现本网站颁发的拥有Cookie的剧情,如图1.1所示。

     
在默许情形下,从服务器上的过渡日志会在SQL线程执行完后被电动删除。然而在MHA环境中,这一个中继日志在平复其余从服务器时大概会被用到,因而供给禁止使用中继日志的全自动清除。改为定期手动清除SQL线程应用完的衔接日志。

    }

     
由于该网址在国内被墙,相关文书下载后,放到了个人网盘中,http://pan.baidu.com/s/1boS31vT,有需要的童鞋可自行下载。

    {

      # head -n 30 all.sql

 

# masterha_stop --conf=/etc/masterha/app1.cnf 
Stopped app1 successfully.
[1]+  Exit 1                  nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /masterha/app1/manager.log 2>&1

               <tr><td>您的年龄:</td>

master_ip_failover

1.2.1  什么是Session

# ll /usr/local/bin/
total 44
-r-xr-xr-x 1 root root 16367 Jul 20 07:00 apply_diff_relay_logs
-r-xr-xr-x 1 root root  4807 Jul 20 07:00 filter_mysqlbinlog
-r-xr-xr-x 1 root root  8261 Jul 20 07:00 purge_relay_logs
-r-xr-xr-x 1 root root  7525 Jul 20 07:00 save_binary_logs

       

# masterha_check_status --conf=/etc/masterha/app1.cnf 
app1 is stopped(2:NOT_RUNNING).  

        return;

       
如若不奇怪,会议及展览示“PING_OK”,不然会来得“NOT_RUNNING”,代表MHA监察和控制还尚未拉开。

    public final static String calcMD1(Stringss) { // MD1 加密算法

     4. 在Slave(192.168.244.30)上配置     

    {

      2. 安装relay log清除方式(在各样Slave上)

<%@ page language=”java”pageEncoding=”UTF-8″ isErrorPage=”false”
%>

     # vim /etc/rsyslog.conf

 

葡京赌场网址 4葡京赌场网址 5

<!– The contents of this file will be loaded for eachweb application
–>

    # ./configure –prefix=/usr/local/keepalived

        {          

在MHA自动故障切换进度中,MHA试图保存master的二进制日志,从而最大程度地保障数据不丢掉,当那并不连续实惠的,譬如,主服务器硬件故障或不或然透过ssh访问,MHA就无奈保存二进制日志,那样就只进行了故障转移但丢失了最新数据。可整合MySQL
5.5中出产的半同台复制来下滑数据丢失的高风险。

request还足以行使getSession(boolean
create)来获得Session。差距是一旦该客户的Session不设有,request.getSession()方法会再次来到null,而getSession(true)会先创制Session再将Session重临。

     添加如下内容:

专注:从客户端读取Cookie时,包涵maxAge在内的任何属性都是不可读的,也不会被交付。浏览器提交Cookie时只会付出name与value属性。maxAge属性只被浏览器用来判断Cookie是不是过期。

 

1.1  Cookie机制

    2. 在拥有的节点上安装mha node

cookie.setDomain(“.helloweenvsfei.com”);           // 设置域名

*** Module::AutoInstall version 1.03
*** Checking for Perl dependencies...
Can't locate CPAN.pm in @INC (@INC contains: inc /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at inc/Module/AutoInstall.pm line 277.

Cookie的maxAge决定着Cookie的有效期,单位为秒(Second)。Cookie中经过getMaxAge()方法与set马克斯Age(int
maxAge)方法来读写maxAge属性。

   编辑/usr/local/bin/master_ip_failover

Cookie是保存在浏览器端的,因而浏览器具有操作Cookie的先决条件。浏览器能够运用脚本程序如JavaScript或许VBScript等操作Cookie。那里以JavaScript为例介绍常用的Cookie操作。例如上边包车型地铁代码会输出本页面全部的库克ie。

      4. 将mysqlbinlog的门径添加到环境变量中

       } catch (Exception e){return null; }

   
LVS+Keepalived搭建MyCAT高可用负载均衡集群

1.1.7  Cookie的有效期

总结:

1.1.10  Cookie的路径

葡京赌场网址 6葡京赌场网址 7

而Web应用程序是采取HTTP协议传输数据的。HTTP协议是无状态的商议。一旦数据交流实现,客户端与劳务器端的连接就会关闭,再一次调换数据需求建立新的连天。那就表示服务器不能够从连续上跟踪会话。即用户A购买了一件货物放入购物车内,当再度买入商品时服务器已经无力回天看清该购买行为是属于用户A的对话如故用户B的对话了。要盯住该会话,必须引入一种体制。

里头,master对外提供写服务,备选master提供读服务,slave也提供相关的读服务,一旦master宕机,将会把准备master提高为新的master,slave指向新的master

cookie.setMaxAge(0);                          //
设置生命周期为0,不能够为负数

Master                         192.168.244.10   1                 写入

葡京赌场网址 8

 

           <table>

     # perl Makefile.PL

response.addCookie(cookie);                    // 输出到客户端

4> MHA中引入keepalived

response对象提供的Cookie操作方法唯有三个加上操作add(Cookie cookie)。

  1. keepalived管理VIP

       mdTemp.update(strTemp);                                //
更新数据

   
  ignore_last_failover:在暗中认可处境下,MHA发生切换后将会在/masterha/app1下发生app1.failover.complete文件,下次再一次切换的时候要是发现该目录下存在该公文且一回切换的时间距离不足8小时的话,将不容许触发切换。除非在第二回切换后手动rm
-rf
/masterha/app1/app1.failover.complete。该参数代表忽略上次MHA触发切换爆发的文书。

在意:用户登录网站www.google.com之后会发现访问images.google.com时登录音信依旧有效,而经常的Cookie是做不到的。那是因为谷歌做了特出处理。本章前边也会对库克ie做类似的处理。

mysql> grant replication slave on *.* to 'repl'@'192.168.244.%' identified by 'repl';
Query OK, 0 rows affected (0.09 sec)

 

# ll /usr/local/bin/
total 40
-r-xr-xr-x 1 root root 1991 Jul 20 00:50 masterha_check_repl
-r-xr-xr-x 1 root root 1775 Jul 20 00:50 masterha_check_ssh
-r-xr-xr-x 1 root root 1861 Jul 20 00:50 masterha_check_status
-r-xr-xr-x 1 root root 3197 Jul 20 00:50 masterha_conf_host
-r-xr-xr-x 1 root root 2513 Jul 20 00:50 masterha_manager
-r-xr-xr-x 1 root root 2161 Jul 20 00:50 masterha_master_monitor
-r-xr-xr-x 1 root root 2369 Jul 20 00:50 masterha_master_switch
-r-xr-xr-x 1 root root 5167 Jul 20 00:50 masterha_secondary_check
-r-xr-xr-x 1 root root 1735 Jul 20 00:50 masterha_stop

 

MHA在线切换的步子和原理

%>

       
–disable_relay_log_purge:暗中同意意况下,如若relay_log_purge=1,则脚本会直接退出。通过安装这几个参数,该脚本会首先将relay_log_purge设置为1,清除掉relay
log后,再将该参数设置为0。

<%

     keepalived的日志暗许是出口到/var/log/message中

    elseif(“logout”.equals(action)){                  //
如果为logout动作

[server default]
manager_log=/masterha/app1/manager.log          //设置manager的日志
manager_workdir=/masterha/app1           //设置manager的工作目录
master_binlog_dir=/var/lib/mysql                  //设置master默认保存binlog的位置,以便MHA可以找到master的日志
master_ip_failover_script= /usr/local/bin/master_ip_failover    //设置自动failover时候的切换脚本
master_ip_online_change_script= /usr/local/bin/master_ip_online_change  //设置手动切换时候的切换脚本
user=monitor               // 设置监控用户
password=monitor123         //设置监控用户的密码
ping_interval=1         //设置监控主库,发送ping包的时间间隔,默认是3秒,尝试三次没有回应的时候进行自动failover
remote_workdir=/tmp     //设置远端mysql在发生切换时binlog的保存位置
repl_user=repl          //设置复制环境中的复制用户名
repl_password=repl    //设置复制用户的密码
report_script=/usr/local/bin/send_report    //设置发生切换后发送的报警的脚本
secondary_check_script= /usr/local/bin/masterha_secondary_check -s 192.168.244.20 -s 192.168.244.30 --user=root --master_host=192.168.244.10 --master_ip=192.168.244.10 --master_port=3306  //一旦MHA到master的监控之间出现问题,MHA Manager将会判断其它两个slave是否能建立到master_ip 3306端口的连接
shutdown_script=""      //设置故障发生后关闭故障主机脚本(该脚本的主要作用是关闭主机防止发生脑裂)
ssh_user=root           //设置ssh的登录用户名

[server1]
hostname=192.168.244.10
port=3306

[server2]
hostname=192.168.244.20
port=3306
candidate_master=1   //设置为候选master,如果设置该参数以后,发生主从切换以后将会将此从库提升为主库,即使这个主库不是集群中最新的slave
check_repl_delay=0   //默认情况下如果一个slave落后master 100M的relay logs的话,MHA将不会选择该slave作为一个新的master,因为对于这个slave的恢复需要花费很长时间,通过设置check_repl_delay=0,MHA触发切换在选择一个新的master的时候将会忽略复制延时,这个参数对于设置了candidate_master=1的主机非常有用,因为它保证了这个候选主在切换过程中一定是最新的master

[server3]
hostname=192.168.244.30
port=3306

提示:Session的应用比库克ie方便,然而过多的Session存款和储蓄在服务器内部存款和储蓄器中,会对服务器造成压力。

       
MHA在切换的经过中会直接调用mysqlbinlog命令,故须求在环境变量中钦赐mysqlbinlog的现实性途径。

本文转自:http://blog.csdn.net/fangaoxin/article/details/6952954/

  1. masterha_check_ssh:检查MHA的SSH配置情形

  2. masterha_check_repl:检查MySQL的复制场景

  3. masterha_manager:启动MHA

  4. masterha_check_status:检查和测试当前MHA运营状态

  5. masterha_master_monitor:检测master是或不是宕机

  6. masterha_master_switch:控制故障转移(自动或手动)

  7. masterha_conf_host:添加或删除配置的server新闻

  8. masterha_stop:关闭MHA

           </table>

     
在ext3文件系统下,删除大的文本须要自然的日子,这样会造成惨重的复制延迟,所以在Linux中,一般都以通过硬链接的法门来删除大文件。

 

      2>
配置文件中装置了master_ip_failover_script,secondary_check_script,master_ip_online_change_script,report_script,对应的公文见小说末
尾。

1.2.8  Session中明确命令禁止利用Cookie

      注意:

代码1.12  context.xml

 /usr/local/bin/master_ip_online_change --command=stop --orig_master_ip=192.168.244.10 --orig_master_host=192.168.244.10 --orig_master_port=3306 --orig_master_user=monitor --orig_master_password=monitor123 --orig_master_ssh_user=root --new_master_host=192.168.244.20 --new_master_ip=192.168.244.20 --new_master_port=3306 --new_master_user=monitor --new_master_password=monitor123 --new_master_ssh_user=root

        char str[] = newchar[j \* 2];                  
    // 新字符串数组

Wed Jul 20 15:49:58 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Wed Jul 20 15:49:58 2016 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Wed Jul 20 15:49:58 2016 - [info] Reading server configuration from /etc/masterha/app1.cnf..
Wed Jul 20 15:49:58 2016 - [info] MHA::MasterMonitor version 0.56.
Wed Jul 20 15:49:59 2016 - [info] GTID failover mode = 0
Wed Jul 20 15:49:59 2016 - [info] Dead Servers:
Wed Jul 20 15:49:59 2016 - [info] Alive Servers:
Wed Jul 20 15:49:59 2016 - [info]   192.168.244.10(192.168.244.10:3306)
Wed Jul 20 15:49:59 2016 - [info]   192.168.244.20(192.168.244.20:3306)
Wed Jul 20 15:49:59 2016 - [info]   192.168.244.30(192.168.244.30:3306)
Wed Jul 20 15:49:59 2016 - [info] Alive Slaves:
Wed Jul 20 15:49:59 2016 - [info]   192.168.244.20(192.168.244.20:3306)  Version=5.6.31-log (oldest major version between slaves) log-bin:enabled
Wed Jul 20 15:49:59 2016 - [info]     Replicating from 192.168.244.10(192.168.244.10:3306)
Wed Jul 20 15:49:59 2016 - [info]     Primary candidate for the new Master (candidate_master is set)
Wed Jul 20 15:49:59 2016 - [info]   192.168.244.30(192.168.244.30:3306)  Version=5.6.31-log (oldest major version between slaves) log-bin:enabled
Wed Jul 20 15:49:59 2016 - [info]     Replicating from 192.168.244.10(192.168.244.10:3306)
Wed Jul 20 15:49:59 2016 - [info] Current Alive Master: 192.168.244.10(192.168.244.10:3306)
Wed Jul 20 15:49:59 2016 - [info] Checking slave configurations..
Wed Jul 20 15:49:59 2016 - [info] Checking replication filtering settings..
Wed Jul 20 15:49:59 2016 - [info]  binlog_do_db= , binlog_ignore_db= 
Wed Jul 20 15:49:59 2016 - [info]  Replication filtering check ok.
Wed Jul 20 15:49:59 2016 - [info] GTID (with auto-pos) is not supported
Wed Jul 20 15:49:59 2016 - [info] Starting SSH connection tests..
Wed Jul 20 15:50:17 2016 - [info] All SSH connection tests passed successfully.
Wed Jul 20 15:50:17 2016 - [info] Checking MHA Node version..
Wed Jul 20 15:50:18 2016 - [info]  Version check ok.
Wed Jul 20 15:50:18 2016 - [info] Checking SSH publickey authentication settings on the current master..
Wed Jul 20 15:50:20 2016 - [info] HealthCheck: SSH to 192.168.244.10 is reachable.
Wed Jul 20 15:50:21 2016 - [info] Master MHA Node version is 0.56.
Wed Jul 20 15:50:21 2016 - [info] Checking recovery script configurations on 192.168.244.10(192.168.244.10:3306)..
Wed Jul 20 15:50:21 2016 - [info]   Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/var/lib/mysql --output_file=/tmp/save_binary_logs_test --manager_version=0.56 --start_file=mysqld-bin.000002 
Wed Jul 20 15:50:21 2016 - [info]   Connecting to root@192.168.244.10(192.168.244.10:22).. 
  Creating /tmp if not exists..    ok.
  Checking output directory is accessible or not..
   ok.
  Binlog found at /var/lib/mysql, up to mysqld-bin.000002
Wed Jul 20 15:50:23 2016 - [info] Binlog setting check done.
Wed Jul 20 15:50:23 2016 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..
Wed Jul 20 15:50:23 2016 - [info]   Executing command : apply_diff_relay_logs --command=test --slave_user='monitor' --slave_host=192.168.244.20 --slave_ip=192.168.244.20 --slave_port=3306 --workdir=/tmp --target_version=5.6.31-log --manager_version=0.56 --relay_log_info=/var/lib/mysql/relay-log.info  --relay_dir=/var/lib/mysql/  --slave_pass=xxx
Wed Jul 20 15:50:23 2016 - [info]   Connecting to root@192.168.244.20(192.168.244.20:22).. 
  Checking slave recovery environment settings..
    Opening /var/lib/mysql/relay-log.info ... ok.
    Relay log found at /var/lib/mysql, up to mysqld-relay-bin.000004
    Temporary relay log file is /var/lib/mysql/mysqld-relay-bin.000004
    Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
 done.
    Testing mysqlbinlog output.. done.
    Cleaning up test file(s).. done.
Wed Jul 20 15:50:28 2016 - [info]   Executing command : apply_diff_relay_logs --command=test --slave_user='monitor' --slave_host=192.168.244.30 --slave_ip=192.168.244.30 --slave_port=3306 --workdir=/tmp --target_version=5.6.31-log --manager_version=0.56 --relay_log_info=/var/lib/mysql/relay-log.info  --relay_dir=/var/lib/mysql/  --slave_pass=xxx
Wed Jul 20 15:50:28 2016 - [info]   Connecting to root@192.168.244.30(192.168.244.30:22).. 
  Checking slave recovery environment settings..
    Opening /var/lib/mysql/relay-log.info ... ok.
    Relay log found at /var/lib/mysql, up to mysqld-relay-bin.000008
    Temporary relay log file is /var/lib/mysql/mysqld-relay-bin.000008
    Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.
 done.
    Testing mysqlbinlog output.. done.
    Cleaning up test file(s).. done.
Wed Jul 20 15:50:32 2016 - [info] Slaves settings check done.
Wed Jul 20 15:50:32 2016 - [info] 
192.168.244.10(192.168.244.10:3306) (current master)
 +--192.168.244.20(192.168.244.20:3306)
 +--192.168.244.30(192.168.244.30:3306)

Wed Jul 20 15:50:32 2016 - [info] Checking replication health on 192.168.244.20..
Wed Jul 20 15:50:32 2016 - [info]  ok.
Wed Jul 20 15:50:32 2016 - [info] Checking replication health on 192.168.244.30..
Wed Jul 20 15:50:32 2016 - [info]  ok.
Wed Jul 20 15:50:32 2016 - [info] Checking master_ip_failover_script status:
Wed Jul 20 15:50:32 2016 - [info]   /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.244.10 --orig_master_ip=192.168.244.10 --orig_master_port=3306 
Wed Jul 20 15:50:32 2016 - [info]  OK.
Wed Jul 20 15:50:32 2016 - [warning] shutdown_script is not defined.
Wed Jul 20 15:50:32 2016 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.

 

     # mkdir -p /etc/masterha

鉴于JavaScript能够自由地读写Cookie,有些好事者便想选拔JavaScript程序去偷看用户在其余网站的库克ie。但是那是徒劳的,W3C组织现已发现到JavaScript对Cookie的读写所带来的安全隐患并加避防备了,W3C标准的浏览器会阻止JavaScript读写任何不属于自个儿网站的Cookie。换句话说,A网站的JavaScript程序读写B网站的Cookie不会有其余结果。

葡京赌场网址 9葡京赌场网址 10

Java中把Cookie封装成了javax.servlet.http.Cookie类。每个Cookie都以该Cookie类的对象。服务器通过操作Cookie类对象对客户端Cookie实行操作。通过request.getCookie()获取客户端提交的持有Cookie(以Cookie[]数组格局再次来到),由此response.addCookie(Cookiecookie)向客户端设置Cookie。

 

       response.sendRedirect(request.getRequestURI() + “?” + System.    
    currentTimeMillis());

mysql> CHANGE MASTER TO
    -> MASTER_HOST='192.168.244.10',
    -> MASTER_USER='repl',
    -> MASTER_PASSWORD='repl',
    -> MASTER_LOG_FILE='mysql-bin.000002',
    -> MASTER_LOG_POS=120;
Query OK, 0 rows affected, 2 warnings (0.19 sec)

mysql> start slave;
Query OK, 0 rows affected (0.02 sec)

mysql> show slave status\G

                   <td><%= loginTime%></td>

    # wget http://www.keepalived.org/software/keepalived-1.2.24.tar.gz

    if(“login”.equals(action)){                       // 如果为login动作

   
注意:大家为何在那边设置keepalived为backup情势呢?

 

在其实生产中选拔较多的也是第3种,即在剧本中手动管理VIP,所以,对keepalived不感兴趣的童鞋可直接跳过第叁种艺术。

1.1.2  记录用户访问次数

肆 、搭建主从复制环境

对此WAP程序,由于多数的手机浏览器都不帮忙Cookie,WAP程序都会选拔U中华VL地址重写来跟踪用户会话。比如用友公司的位移商街等。

        –user:mysql用户名

当多少个客户端执行顺序时,服务器会保留几个客户端的Session。获取Session的时候也不须求申明拿到哪个人的Session。Session机制控制了眼下客户只会博得到祥和的Session,而不会赢获得人家的Session。各客户的Session也互相独立,互不可知

filter_mysqlbinlog:去除不须求的ROLLBACK事件(MHA已不复利用那些工具)

        int timeout = newInteger(request.getParameter(“timeout”));    
                                                 // 获取timeout参数

View Code

</td>

     如:

若是要去除有个别Cookie,只须求新建一个同名的Cookie,并将maxAge设置为0,并添加到response中覆盖原来的Cookie。注意是0而不是负数。负数代表任何的意思。读者能够透过上例的主次开始展览认证,设置不一致的性质。

     5. 在Candicate master上搭建从库

<%!

    # cp /usr/local/keepalived/etc/keepalived/keepalived.conf
/etc/keepalived/

       

     相对于原文件,修改地点为93-95行

</session-config>

 

response.addCookie(cookie);                           // 输出到客户端

     # vim /etc/masterha/app1.cnf

        new Person(“Hello Kitty”,”hellokitty”, 23, dateFormat.parse    
    (“1984-02-21”)),

     # make 

cookie.setMaxAge(Integer.MAX_VALUE);           //
设置生命周期为MAX_VALUE

      # tar xvf mha4mysql-node-0.56.tar.gz

        <% } %>

View Code

    String ssid = null;                           // SSID标识

View Code

Session的超时时间也能够在web.xml中期维修改。别的,通过调用Session的invalidate()方法能够使Session失效。

     当中,-卡宴是备份存款和储蓄进程,–triggers是备份触发器 -A代表全库

1.1.3  Cookie的不足跨域名性

masterha_secondary_check

源代码如下:

1> 安装keepalived

专注:Cookie效能供给浏览器的支撑。

/usr/local/bin/master_ip_failover --command=start --ssh_user=root --orig_master_host=192.168.244.10 --orig_master_ip=192.168.244.10 --orig_master_port=3306 --new_master_host=192.168.244.20 --new_master_ip=192.168.244.20 --new_master_port=3306 --new_master_user='monitor' --new_master_password='monitor123'

               <tr><td>登录时间:</td>

葡京赌场网址 11葡京赌场网址 12

</Context>

       注意:最好是每台slave服务器在分裂时间点执行该铺排职责。

1.1.1  什么是Cookie

     4. 将备份文件复制到Candicate master和Slave上

代码1.11 /META-INF/context.xml

     # mysql < all.sql 

安装为“/”时允许具备路线使用Cookie。path属性需求选择标志“/”结尾。name相同但domain相同的七个Cookie也是两个差异的Cookie。

       7. slave服务器设置为read only

答案是还是不是认的。Cookie具有不可跨域名性。依据Cookie规范,浏览器访问谷歌(Google)只会带走谷歌的Cookie,而不会带走Baidu的Cookie。谷歌也只可以操作谷歌(Google)的Cookie,而不能够操作Baidu的库克ie。

VIP配置能够利用三种方式,一是通过引入Keepalived来管理VIP,另一种是在本子中手动管理。

       response.addCookie(ssidCookie);         // 输出到客户端

apply_diff_relay_logs:识别差其余relay
log并将距离的event应用到其余slave中

假定浏览器不匡助Cookie(如超越八分之四有线电话中的浏览器)或然把Cookie禁用了,Cookie效能就会失灵。

  1. 通过脚本的法门管理VIP

   

       # masterha_check_ssh –conf=/etc/masterha/app1.cnf

                   <td><%= person.getAge()%></td>

View Code

               ssid = cookie.getValue();          // 保存SSID内容

二 、在Monitor host节点上配置MHA
Manager

    boolean login = false;                        // 是还是不是登录

     可知,VIP(壹玖贰贰68.244.188)已经绑定到Master的eth0网卡上了。

               <tr><td></td>

十、
关闭MHA Manager监控

                   <td><%= person.getName()%></td>

集群信息

        int j =md.length;                                 //
加密后的尺寸

MHA自动Failover与手动Failover的施行及原理

        message = “用户名密码不匹配,登录失败。”;       // 登录失利

KEEPALIVED_OPTIONS="-D -d -S 0"

        <% } else {%>

附:

注意:<session-timeout>参数的单位为分钟,而set马克斯InactiveInterval(int
s)单位为秒。

十一、VIP配置

 

    报错很明朗,Candicate
master和Slave都尚未运转log-bin,借使没有运转以来,后续就无法升迁为主

        new Person(“Garfield”, “garfield_pass”,23, dateFormat.parse    
    (“1994-09-12”)),

     启动Candicate master的keepalived

               <tr><td>账号: </td>

     编辑/usr/local/bin/master_ip_failover

汤姆cat中Session的暗中同意超时时间为20分钟。通过set马克斯InactiveInterval(int
seconds)修改超时时间。能够修改web.xml改变Session的暗中同意超时时间。例如修改为60分钟:

        设置crontab来定期清理relay log

Cookie意为“甜饼”,是由W3C协会提议,最早由Netscape社区升高的一种体制。如今Cookie已经济体改成专业,全数的主流浏览器如IE、Netscape、Firefox、Opera等都协理Cookie。

    # ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.244.10

        int k =0;                                         // 计数器k

    # ssh-keygen

图1.7  永久登录

MHA Manager:

        new Person(“Liu Jinghua”,”password1″, 34, dateFormat.parse    
    (“1982-01-01”)),

九、开启MHA Manager监控

%>

     # vim /etc/sysconfig/keepalived

UPRADOL地址重写是对客户端不协助Cookie的缓解方案。U路虎极光L地址重写的法则是将该用户Session的id新闻重写到U景逸SUVL地址中。服务器能够分析重写后的U昂CoraL获取Session的id。那样就算客户端不帮助Cookie,也足以采取Session来记录用户意况。HttpServletResponse类提供了encodeU君越L(Stringurl)实现ULacrosseL地址重写,例如:

     查看MHA Manager监察和控制是不是正规

               </tr>

迄今停止,MHA高可用环境为主搭建完成。

<jsp:directive.pageimport=”com.helloweenvsfei.sessionWeb.bean.Person”/>

葡京赌场网址 13葡京赌场网址 14

    if(request.getCookies() !=null){               // 如果Cookie不为空

    倘若没有Candicate
master,七个Slave的地位平等,则八个Slave上都需安装keepalived。

1.1.5  BASE64编码:保存二进制图片

Can't locate ExtUtils/MakeMaker.pm in @INC (@INC contains: inc /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at inc/Module/Install/Can.pm line 6.
BEGIN failed--compilation aborted at inc/Module/Install/Can.pm line 6.
Compilation failed in require at inc/Module/Install.pm line 283.
Can't locate ExtUtils/MakeMaker.pm in @INC (@INC contains: inc /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at inc/Module/Install/Makefile.pm line 4.
BEGIN failed--compilation aborted at inc/Module/Install/Makefile.pm line 4.
Compilation failed in require at inc/Module/Install.pm line 283.
Can't locate ExtUtils/MM_Unix.pm in @INC (@INC contains: inc /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at inc/Module/Install/Metadata.pm line 349.

<jsp:directive.page import=”java.text.SimpleDateFormat”/>

    # ssh-keygen

出于会有越多的用户访问服务器,因而Session也会尤其多。为预防内存溢出,服务器会把长日子内尚未活跃的Session从内存删除。那个时刻正是Session的晚点时间。假设超越了晚点时间没访问过服务器,Session就机关失效了。

#!/usr/bin/env perl

#  Copyright (C) 2011 DeNA Co.,Ltd.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#  Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

## Note: This is a sample script and is not complete. Modify the script based on your environment.

use strict;
use warnings FATAL => 'all';

use Getopt::Long;
use MHA::DBHelper;
my (
  $command,        $ssh_user,         $orig_master_host,
  $orig_master_ip, $orig_master_port, $new_master_host,
  $new_master_ip,  $new_master_port,  $new_master_user,
  $new_master_password
);

my $vip = '192.168.244.188';
my $key = "2";
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip/24";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
my $ssh_send_garp = "/sbin/arping -U $vip -I eth0 -c 1";


GetOptions(
  'command=s'             => \$command,
  'ssh_user=s'            => \$ssh_user,
  'orig_master_host=s'    => \$orig_master_host,
  'orig_master_ip=s'      => \$orig_master_ip,
  'orig_master_port=i'    => \$orig_master_port,
  'new_master_host=s'     => \$new_master_host,
  'new_master_ip=s'       => \$new_master_ip,
  'new_master_port=i'     => \$new_master_port,
  'new_master_user=s'     => \$new_master_user,
  'new_master_password=s' => \$new_master_password,
);

exit &main();

sub main {
  if ( $command eq "stop" || $command eq "stopssh" ) {

    # $orig_master_host, $orig_master_ip, $orig_master_port are passed.
    # If you manage master ip address at global catalog database,
    # invalidate orig_master_ip here.
    my $exit_code = 1;
    eval {
      print "Disabling the VIP an old master: $orig_master_host \n";
      &stop_vip();
      $exit_code = 0;
    };
    if ($@) {
      warn "Got Error: $@\n";
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "start" ) {

    # all arguments are passed.
    # If you manage master ip address at global catalog database,
    # activate new_master_ip here.
    # You can also grant write access (create user, set read_only=0, etc) here.
    my $exit_code = 10;
    eval {

      my $new_master_handler = new MHA::DBHelper();

      # args: hostname, port, user, password, raise_error_or_not
      $new_master_handler->connect( $new_master_ip, $new_master_port,
        $new_master_user, $new_master_password, 1 );

      ## Set read_only=0 on the new master
      $new_master_handler->disable_log_bin_local();
      print "Set read_only=0 on the new master.\n";
      $new_master_handler->disable_read_only();

      ## Creating an app user on the new master
      # print "Creating app user on the new master..\n";
      # FIXME_xxx_create_user( $new_master_handler->{dbh} );
      $new_master_handler->enable_log_bin_local();
      $new_master_handler->disconnect();

      print "Enabling the VIP $vip on the new master: $new_master_host \n";
      &start_vip();
      $exit_code = 0;
    };
    if ($@) {
      warn $@;

      # If you want to continue failover, exit 10.
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "status" ) {

    # do nothing
    exit 0;
  }
  else {
    &usage();
    exit 1;
  }
}

sub start_vip(){
    `ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
    `ssh $ssh_user\@$new_master_host \" $ssh_send_garp \"`;
}

sub stop_vip(){
    return 0  unless  ($ssh_user);
    `ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
}

sub usage {
  print
"Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
}

瞩目:修改、删除Cookie时,新建的Cookie除value、maxAge之外的有所属性,例如name、path、domain等,都要与原Cookie完全等同。不然,浏览器将视为五个分裂的Cookie不予覆盖,导致修改、删除失利。

#!/usr/bin/env perl

#  Copyright (C) 2011 DeNA Co.,Ltd.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#  Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

## Note: This is a sample script and is not complete. Modify the script based on your environment.

use strict;
use warnings FATAL => 'all';

use Getopt::Long;
use MHA::DBHelper;
my (
  $command,        $ssh_user,         $orig_master_host,
  $orig_master_ip, $orig_master_port, $new_master_host,
  $new_master_ip,  $new_master_port,  $new_master_user,
  $new_master_password
);

my $vip = '192.168.244.188';
my $key = "2";
my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip/24";
my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";
my $ssh_send_garp = "/sbin/arping -U $vip -I eth0 -c 1";


GetOptions(
  'command=s'             => \$command,
  'ssh_user=s'            => \$ssh_user,
  'orig_master_host=s'    => \$orig_master_host,
  'orig_master_ip=s'      => \$orig_master_ip,
  'orig_master_port=i'    => \$orig_master_port,
  'new_master_host=s'     => \$new_master_host,
  'new_master_ip=s'       => \$new_master_ip,
  'new_master_port=i'     => \$new_master_port,
  'new_master_user=s'     => \$new_master_user,
  'new_master_password=s' => \$new_master_password,
);

exit &main();

sub main {
  if ( $command eq "stop" || $command eq "stopssh" ) {

    # $orig_master_host, $orig_master_ip, $orig_master_port are passed.
    # If you manage master ip address at global catalog database,
    # invalidate orig_master_ip here.
    my $exit_code = 1;
    eval {
      print "Disabling the VIP an old master: $orig_master_host \n";
      &stop_vip();
      $exit_code = 0;
    };
    if ($@) {
      warn "Got Error: $@\n";
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "start" ) {

    # all arguments are passed.
    # If you manage master ip address at global catalog database,
    # activate new_master_ip here.
    # You can also grant write access (create user, set read_only=0, etc) here.
    my $exit_code = 10;
    eval {

      my $new_master_handler = new MHA::DBHelper();

      # args: hostname, port, user, password, raise_error_or_not
      $new_master_handler->connect( $new_master_ip, $new_master_port,
        $new_master_user, $new_master_password, 1 );

      ## Set read_only=0 on the new master
      $new_master_handler->disable_log_bin_local();
      print "Set read_only=0 on the new master.\n";
      $new_master_handler->disable_read_only();

      ## Creating an app user on the new master
      # print "Creating app user on the new master..\n";
      # FIXME_xxx_create_user( $new_master_handler->{dbh} );
      $new_master_handler->enable_log_bin_local();
      $new_master_handler->disconnect();

      print "Enabling the VIP $vip on the new master: $new_master_host \n";
      &start_vip();
      $exit_code = 0;
    };
    if ($@) {
      warn $@;

      # If you want to continue failover, exit 10.
      exit $exit_code;
    }
    exit $exit_code;
  }
  elsif ( $command eq "status" ) {

    # do nothing
    exit 0;
  }
  else {
    &usage();
    exit 1;
  }
}

sub start_vip(){
    `ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;
    `ssh $ssh_user\@$new_master_host \" $ssh_send_garp \"`;
}

sub stop_vip(){
    return 0  unless  ($ssh_user);
    `ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;
}

sub usage {
  print
"Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
}

    }

 

Cookie正是那样的一种机制。它能够弥补HTTP协议无状态的欠缺。在Session出现此前,基本上全数的网站都应用库克ie来跟踪会话。

        其中,

代码1.9  session.jsp

     # ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.244.20

        for(Cookie cookie :request.getCookies()){  // 遍历Cookie

    # yum install perl-CPAN -y

例如:

1.
可独自调节和测试master_ip_failover,master_ip_online_change,send_report等脚本

 

View Code

 

Wed Jul 20 14:44:30 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Wed Jul 20 14:44:30 2016 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Wed Jul 20 14:44:30 2016 - [info] Reading server configuration from /etc/masterha/app1.cnf..
Wed Jul 20 14:44:30 2016 - [info] MHA::MasterMonitor version 0.56.
Wed Jul 20 14:44:31 2016 - [info] GTID failover mode = 0
Wed Jul 20 14:44:31 2016 - [info] Dead Servers:
Wed Jul 20 14:44:31 2016 - [info] Alive Servers:
Wed Jul 20 14:44:31 2016 - [info]   192.168.244.10(192.168.244.10:3306)
Wed Jul 20 14:44:31 2016 - [info]   192.168.244.20(192.168.244.20:3306)
Wed Jul 20 14:44:31 2016 - [info]   192.168.244.30(192.168.244.30:3306)
Wed Jul 20 14:44:31 2016 - [info] Alive Slaves:
Wed Jul 20 14:44:31 2016 - [info]   192.168.244.20(192.168.244.20:3306)  Version=5.6.31 (oldest major version between slaves) log-bin:disabled
Wed Jul 20 14:44:31 2016 - [info]     Replicating from 192.168.244.10(192.168.244.10:3306)
Wed Jul 20 14:44:31 2016 - [info]     Primary candidate for the new Master (candidate_master is set)
Wed Jul 20 14:44:31 2016 - [info]   192.168.244.30(192.168.244.30:3306)  Version=5.6.31 (oldest major version between slaves) log-bin:disabled
Wed Jul 20 14:44:31 2016 - [info]     Replicating from 192.168.244.10(192.168.244.10:3306)
Wed Jul 20 14:44:31 2016 - [info] Current Alive Master: 192.168.244.10(192.168.244.10:3306)
Wed Jul 20 14:44:31 2016 - [info] Checking slave configurations..
Wed Jul 20 14:44:31 2016 - [warning]  log-bin is not set on slave 192.168.244.20(192.168.244.20:3306). This host cannot be a master.
Wed Jul 20 14:44:31 2016 - [warning]  log-bin is not set on slave 192.168.244.30(192.168.244.30:3306). This host cannot be a master.
Wed Jul 20 14:44:31 2016 - [info] Checking replication filtering settings..
Wed Jul 20 14:44:31 2016 - [info]  binlog_do_db= , binlog_ignore_db= 
Wed Jul 20 14:44:31 2016 - [info]  Replication filtering check ok.
Wed Jul 20 14:44:31 2016 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln361] None of slaves can be master. Check failover configuration file or log-bin settings in my.cnf
Wed Jul 20 14:44:31 2016 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations.  at /usr/local/bin/masterha_check_repl line 48.
Wed Jul 20 14:44:31 2016 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.
Wed Jul 20 14:44:31 2016 - [info] Got exit code 1 (Not master dead).

MySQL Replication Health is NOT OK!

               response.sendRedirect(request.getContextPath() +
“/welcome.jsp”);

     设置复制消息

       response.addCookie(accountCookie);             // 输出到客户端

 

%注意:本程序仅用于展现Cookie中得以储存二进制内容,并不实用。由于浏览器每一趟请求服务器都会带走Cookie,由此Cookie内容不宜过多,不然影响速度。Cookie的剧情应当少而精。

     # make

            // 假若用户名科学且密码正确

 

   

它由两有个别组成:MHA Manager(管理节点)和MHA Node(数据节点)。当中,MHA
Manager能够单独布署在一台独立的机器上管理四个master-slave集群,也可以安顿在一台slave上。MHA
Node则运维在各类mysql节点上,MHA
Manager会定时探测集群中的master节点,当master出现故障时,它自动将新型数据的slave升高为master,然后将其他具有的slave指向新的master。

健康情形下,同一个超级域归属的八个二级域名如www.helloweenvsfei.com和images.helloweenvsfei.com也不能够相互使用Cookie,因为两岸的域名并不严谨平等。假使想有所helloweenvsfei.com名下的二级域名都能够使用该Cookie,必要设置Cookie的domain参数,例如:

 2.
官方对此master_ip_failover,master_ip_online_change,send_report脚本,给出的只是sample,切换的逻辑需求协调定义。

 

对此keepalived管理VIP,存在脑裂意况,即当主从互连网出现难点时,slave会抢占VIP,那样会造成基本数据库都具有VIP,造成IP争论,所以在互联网不是很好的气象下,不提出利用keepalived服务。

       <legend><%= login ? “欢迎您回来” :
“请首先登场录”%></legend>

 

        return newString(str);                             //
加密后字符串

 

 

葡京赌场网址 15葡京赌场网址 16

        </form>

    # ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.244.20

    if(request.getMethod().equals(“POST”))

     2. 在Master上创造复制用户

<?xml version=’1.0′ encoding=’UTF-8′?>

         上面看看剧本的应用方法:

Session保存在劳务器端。为了博取更高的存取速度,服务器一般把Session放在内部存款和储蓄器里。每一个用户都会有二个单独的Session。要是Session内容过于复杂,当大气客户走访服务器时大概会造成内部存款和储蓄器溢出。因而,Session里的新闻应该尽量精简。

mysql> set global read_only=1;
Query OK, 0 rows affected (0.04 sec)

 

     # chmod +x /etc/init.d/keepalived

 

     # yum install perl-ExtUtils-MakeMaker -y

           {              

     # perl Makefile.PL  

1.1.11  Cookie的铁岭品质

     1. 在Monitor
host(192.168.244.40)上创办MHA工作目录,并且创建连锁安顿文件

Cookie是不行跨域名的。域名www.google.com颁发的库克ie不会被交给到域名www.baidu.com去。那是由Cookie的隐情安全机制控制的。隐秘安全体制能够禁止网站不合规获得其他网站的Cookie。

    关于keepalived的参数的详实介绍,可参看:

              

六、
检查SSH的配置

例如:

3> 启动keepalived

<jsp:directive.page import=”java.util.Date”/>

     
remove_dead_master_conf:该参数代表当产生主从切换后,老的主库的IP将会从布局文件中移除。

       accountCookie.set马克斯Age(timeout);              // 设置有效期

    至此,MHA node节点安装收尾,会在/usr/local/bin下生成以下脚本文件

<html>

葡京赌场网址 17葡京赌场网址 18

response.addCookie(cookie);                       // 输出到客户端

MHA Node:

留意:该配置只是禁止Session使用Cookie作为识别标志,并无法拦截其余的Cookie读写。也便是说服务器不会自行爱惜名为JSESSIONID的Cookie了,但是程序中依然能够读写其余的Cookie。

     在Master上修改

程序运转效果如图1.8所示。

   
在master-backup形式下,假如主库宕掉,VIP会自动漂移到Slave上,当主库修复,keepalived运维后,还会将VIP抢过来,就算设置了nopreempt(不抢占)的方

方  法  名

描    述

void setAttribute(String attribute, Object value)

设置Session属性。value参数可以为任何Java Object。通常为Java Bean。value信息不宜过大

String getAttribute(String attribute)

返回Session属性

Enumeration getAttributeNames()

返回Session中存在的属性名

void removeAttribute(String attribute)

移除Session属性

String getId()

返回Session的ID。该ID由服务器自动创建,不会重复

long getCreationTime()

返回Session的创建日期。返回类型为long,常被转化为Date类型,例如:Date createTime = new Date(session.get CreationTime())

long getLastAccessedTime()

返回Session的最后活跃时间。返回类型为long

int getMaxInactiveInterval()

返回Session的超时时间。单位为秒。超过该时间没有访问,服务器认为该Session失效

void setMaxInactiveInterval(int second)

设置Session的超时时间。单位为秒

void putValue(String attribute, Object value)

不推荐的方法。已经被setAttribute(String attribute, Object Value)替代

Object getValue(String attribute)

不被推荐的方法。已经被getAttribute(String attr)替代

boolean isNew()

返回该Session是否是新创建的

void invalidate()

使该Session失效

葡京赌场网址,     # service keepalived start

属  性  名

描    述

String name

该Cookie的名称。Cookie一旦创建,名称便不可更改

Object value

该Cookie的值。如果值为Unicode字符,需要为字符编码。如果值为二进制数据,则需要使用BASE64编码

int maxAge

该Cookie失效的时间,单位秒。如果为正数,则该Cookie在maxAge秒之后失效。如果为负数,该Cookie为临时Cookie,关闭浏览器即失效,浏览器也不会以任何形式保存该Cookie。如果为0,表示删除该Cookie。默认为–1

boolean secure

该Cookie是否仅被使用安全协议传输。安全协议。安全协议有HTTPS,SSL等,在网络上传输数据之前先将数据加密。默认为false

String path

该Cookie的使用路径。如果设置为“/sessionWeb/”,则只有contextPath为“/sessionWeb”的程序可以访问该Cookie。如果设置为“/”,则本域名下contextPath都可以访问该Cookie。注意最后一个字符必须为“/”

String domain

可以访问该Cookie的域名。如果设置为“.google.com”,则所有以“google.com”结尾的域名都可以访问该Cookie。注意第一个字符必须为“.”

String comment

该Cookie的用处说明。浏览器显示Cookie信息的时候显示该说明

int version

该Cookie使用的版本号。0表示遵循Netscape的Cookie规范,1表示遵循W3C的RFC 2109规范

      1>
在编排该公文时,后边的注释切记要去掉,MHA并不会将前边的始末识别为注释。

<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01Transitional//EN”>

     # mysqldump –master-data=2 –single-transaction -R –triggers -A
> all.sql

 

葡京赌场网址 19葡京赌场网址 20

       

    因为小编那里设置了Candicate master,故只在Master和Candicate
master上设置。

              

View Code

报到时得以接纳登录消息的有效期:关闭浏览器即失效、30天内有效与恒久有效。通过设置Cookie的age属性来贯彻,注意观看代码。运转效果如图1.7所示。

[root@node4 ~]# cat test.pl
#!/usr/bin/perl
use strict;
my $cmd='python /root/test.py';
system($cmd);

[root@node4 ~]# cat test.py
#!/usr/bin/python
print "hello,python"

[root@node4 ~]# perl test.pl
hello,python

图1.第11中学弹出的对话框中显得的为Baidu网站的Cookie。当中第③行BAIDUID记录的正是笔者的身份helloweenvsfei,只是Baidu使用万分的主意将Cookie消息加密了。

View Code

就此同一机器的三个浏览器窗口访问服务器时,会变动四个例外的Session。可是由浏览器窗口内的链接、脚本等打开的新窗口(也等于说不是双击桌面浏览器图标等打开的窗口)除外。那类子窗口会共享父窗口的Cookie,因而会共享三个Session。

send_report

留意:新开的浏览器窗口会生成新的Session,但子窗口除外。子窗口会共用父窗口的Session。例如,在链接上右击,在弹出的敏捷菜单中选用“在新窗口中打开”时,子窗口便能够访问父窗口的Session。

         MHA节点中带有了purge_relay_logs脚本,它能够为relay
log创制硬链接,执行set global
relay_log_purge=1,等待几分钟以便SQL线程切换成新的交接日志,再实践set
global relay_log_purge=0。

 

     1. 在Master上推行备份

1.2.7  U奥迪Q7L地址重写

*** Module::AutoInstall version 1.03
*** Checking for Perl dependencies...
[Core Features]
- DBI        ...loaded. (1.609)
- DBD::mysql ...loaded. (4.013)
*** Module::AutoInstall configuration finished.
Checking if your kit is complete...
Looks good
Writing Makefile for mha4mysql::node

<%!

      其中,

 

master_ip_online_change

 

    3. 翻看备份文件all.sql中的CHANGE MASTEMurano语句

读者可以修改本机C:\WINDOWS\system32\drivers\etc下的hosts文件来配置五个一时域名,然后利用setCookie.jsp程序来设置跨域名Cookie验证domain属性。

     在Monitor host上执行

不等的浏览器选拔差异的章程保留库克ie。

    # cp /usr/local/keepalived/etc/rc.d/init.d/keepalived
/etc/rc.d/init.d/

<jsp:directive.page
import=”com.helloweenvsfei.sessionWeb.bean.Person”/>

global_defs {
   notification_email {
     slowtech@qq.com 
   }
   notification_email_from root@localhost.localdomain 
   smtp_server 127.0.0.1 
   smtp_connect_timeout 30
   router_id MySQL-HA
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 150
    advert_int 1
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.244.188/24
    }
}

    }

 

内需留意的是,尽管网站images.google.com与网站www.google.com同属于谷歌,但是域名分裂,二者同样不能够相互操作相互的Cookie。

    # ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.244.30

domain属性决定运转访问Cookie的域名,而path属性决定允许访问库克ie的途径(ContextPath)。例如,借使只同意/sessionWeb/下的先后行使Cookie,能够这么写:

        –password:mysql用户的密码

代码1.10  welcome.jsp

    1. 在manager上配备到持有Node节点的无密码验证

瞩目:TOMCAT判断客户端浏览器是不是援助Cookie的根据是呼吁中是还是不是含有Cookie。固然客户端可能会辅助Cookie,不过由于第3次呼吁时不会带走任何Cookie(因为并无任何Cookie能够辅导),U猎豹CS6L地址重写后的地方中照旧会包罗jsessionid。当第三回访问时服务器已经在浏览器中写入Cookie了,由此U凯雷德L地址重写后的地点中就不会蕴藏jsessionid了。

        # vim /etc/cron.d/purge_relay_logs

 

     
下载地址为:https://code.google.com/p/mysql-master-ha/wiki/Downloads?tm=2

    Person person
=(Person)session.getAttribute(“person”);                       //
获取登录的person

2> 配置keepalived

       account库克ie.set马克斯Age(0);                // 设置有效期为0,删除

    1. 在MySQL服务器上安装MHA node所需的perl模块(DBD:mysql)

</html>

    # ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.244.10

 

 

1.1.6  设置Cookie的兼具属性

View Code

对话(Session)跟踪是Web程序中常用的技巧,用来钉住用户的全体会话。常用的对话跟踪技术是Cookie与Session。Cookie通过在客户端记录新闻鲜明用户地方Session通过在劳动器端记录新知名确用户身份

      # ssh-keygen

 

 

         byte byte0 =md[i];

       在Monitor host上执行

1.1.9  Cookie的域名

葡京赌场网址 21葡京赌场网址 22

 

2> 为keepalived设置单独的日志文件(非必需)

葡京赌场网址 23

MHA软件由两部分组成:Manager工具包和Node工具包,具体表明如下:

    response.setCharacterEncoding(“UTF-8”);        // 设置response编码

2017-04-24 20:27:46: purge_relay_logs script started.
 Found relay_log.info: /var/lib/mysql/relay-log.info
 Opening /var/lib/mysql/mysqld-relay-bin.000001 ..
 Opening /var/lib/mysql/mysqld-relay-bin.000002 ..
 Opening /var/lib/mysql/mysqld-relay-bin.000003 ..
 Opening /var/lib/mysql/mysqld-relay-bin.000004 ..
 Opening /var/lib/mysql/mysqld-relay-bin.000005 ..
 Opening /var/lib/mysql/mysqld-relay-bin.000006 ..
 Executing SET GLOBAL relay_log_purge=1; FLUSH LOGS; sleeping a few seconds so that SQL thread can delete older relay log files (if i
t keeps up); SET GLOBAL relay_log_purge=0; .. ok.2017-04-24 20:27:50: All relay log purging operations succeeded.

       response.sendRedirect(request.getRequestURI() + “?” + System.    
    currentTimeMillis());

    # mkdir /etc/keepalived

 

    3. 在Candicate master(192.168.244.20)上配置     

        }      

    将布置文件scp到Candicate master上

该Cookie为服务器自动生成的,它的maxAge属性一般为–1,表示仅当前浏览器内有效,并且各浏览器窗口间不共享,关闭浏览器就会失灵。

mysql> set global relay_log_purge=0;
Query OK, 0 rows affected (0.00 sec)

那两种方案表达账号时都要查询数据库。

     设置syslog

                   <td><input type=”text”name=”account”
style=”width:                    200px; “></td>

     # service keepalived start

Servlet中必须采取request来编制程序式获取HttpSession对象,而JSP中放到了Session隐藏对象,能够直接接纳。要是利用评释了<%@page
session=”false”
%>,则Session隐藏对象不可用。上边包车型客车例子使用Session记录客户账号音讯。

    2. 在Master(192.168.244.10)上配置

    String account = null;                        // 账号

 

               session.setAttribute(“loginTime”, new Date());         
// 保存登录的光阴              

葡京赌场网址 24葡京赌场网址 25

        for(Person person :persons)

    # perl Makefile.PL

   <session-timeout>60</session-timeout>      <!–
单位:分钟 –>

Candicate master          192.168.244.20   2                 读

Cookie在客户端是由浏览器来管理的。浏览器能够保险谷歌(Google)只会操作谷歌(Google)的Cookie而不会操作Baidu的Cookie,从而保障用户的心事安全。浏览器判断一个网站是或不是能操作另三个网站Cookie的基于是域名。谷歌(Google)与Baidu的域名不雷同,因而谷歌(Google)不可能操作Baidu的Cookie。

五、
配置MHA

登录界面验证用户登录消息,假诺登录正确,就把用户音信以及登录时间保存进Session,然后转到欢迎页面welcome.jsp。welcome.jsp中从Session中获取音信,并将用户资料展现出来。

     查看绑定景况

<td>

    # ssh-keygen

response.add库克ie(cookie);                    // 必须实施这一句

mysql> grant all privileges on *.* to 'monitor'@'%' identified by 'monitor123';
Query OK, 0 rows affected (0.07 sec)

Session生成后,只要用户继续走访,服务器就会更新Session的最终访问时间,并保证该Session。用户每访问服务器3遍,无论是或不是读写Session,服务器都觉得该用户的Session“活跃(active)”了3次。

 

    <a href=”<%=response.encodeURL(“index.jsp?c=1&wd=Java”)
%>”>     Homepage</a>

   
keepalived工作规律和布置表明

<%

 

Cookie不仅能够利用ASCII字符与Unicode字符,还足以采取二进制数据。例如在Cookie中运用数字证书,提供安全度。使用二进制数据时也亟需展开编码。

Monitor host                 192.168.244.40                    
 监察和控制集群组

如果说Cookie机制是透过检查客户身上的“通行证”来分明客户身份来说,那么Session机制固然通过检查服务器上的“客户明细表”来承认客户身份。Session相当于程序在服务器上树立的一份客户档案,客户来访的时候只须要查询客户档案表就能够了。

View Code

Session的逾期时间为maxInactiveInterval属性,能够透过相应的getMaxInactiveInterval()获取,通过set马克斯InactiveInterval(longinterval)修改。

    # make

即在文书名的末尾,在UCRUISERL参数的日前添加了字符串“;jsessionid=XXX”。个中XXX为Session的id。分析一下能够知晓,扩张的jsessionid字符串既不会潜移默化请求的文书名,也不会潜移默化提交的地点栏参数。用户单击那些链接的时候会把Session的id通过ULANDL提交到服务器上,服务器通过解析U途乐L地址得到Session的id。

# masterha_check_status --conf=/etc/masterha/app1.cnf 
app1 (pid:1873) is running(0:PING_OK), master:192.168.244.10

    String message = “”;                      // 要来得的音讯

View Code

cookie.setMaxAge(Integer.MAX_VALUE);               // 设置有效期

     # make install

welcome.jsp代码如下:

     # service keepalived start

Session中包蕴种种方法,使用起来要比Cookie方便得多。Session的常用方法如表1.2所示。

      3. 设置定期清理relay脚本

        Cookie ssidCookie =new Cookie(“ssid”, “”); //
新建Cookie,内容为空

     # ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.244.10

要想修改Cookie只好动用三个同名的Cookie来覆盖原来的Cookie,达到修改的目标。删除时只须要把maxAge修改为0即可。

     # ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.244.30

1.1.13  案例:永久登录

    # cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

 

#!/bin/env perl

#  Copyright (C) 2011 DeNA Co.,Ltd.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#  Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

use strict;
use warnings FATAL => 'all';

use English qw(-no_match_vars);
use Getopt::Long;
use Pod::Usage;
use MHA::ManagerConst;

my @monitoring_servers;
my (
  $help,        $version,         $ssh_user,  $ssh_port,
  $ssh_options, $master_host,     $master_ip, $master_port,
  $master_user, $master_password, $ping_type
);
my $timeout = 5;

$| = 1;
GetOptions(
  'help'              => \$help,
  'version'           => \$version,
  'secondary_host=s'  => \@monitoring_servers,
  'user=s'            => \$ssh_user,
  'port=s'            => \$ssh_port,
  'options=s'         => \$ssh_options,
  'master_host=s'     => \$master_host,
  'master_ip=s'       => \$master_ip,
  'master_port=i'     => \$master_port,
  'master_user=s'     => \$master_user,
  'master_password=s' => \$master_password,
  'ping_type=s'       => \$ping_type,
  'timeout=i'         => \$timeout,
);

if ($version) {
  print "masterha_secondary_check version $MHA::ManagerConst::VERSION.\n";
  exit 0;
}

if ($help) {
  pod2usage(0);
}

unless ($master_host) {
  pod2usage(1);
}

sub exit_by_signal {
  exit 1;
}
local $SIG{INT} = $SIG{HUP} = $SIG{QUIT} = $SIG{TERM} = \&exit_by_signal;

$ssh_user    = "root" unless ($ssh_user);
$ssh_port    = 22     unless ($ssh_port);
$master_port = 3306   unless ($master_port);

if ($ssh_options) {
  $MHA::ManagerConst::SSH_OPT_CHECK = $ssh_options;
}
$MHA::ManagerConst::SSH_OPT_CHECK =~ s/VAR_CONNECT_TIMEOUT/$timeout/;

# 0: master is not reachable from all monotoring servers
# 1: unknown errors
# 2: at least one of monitoring servers is not reachable from this script
# 3: master is reachable from at least one of monitoring servers
my $exit_code = 0;

foreach my $monitoring_server (@monitoring_servers) {
  my $ssh_user_host = $ssh_user . '@' . $monitoring_server;
  my $command =
"ssh $MHA::ManagerConst::SSH_OPT_CHECK -p $ssh_port $ssh_user_host \"perl -e "
    . "\\\"use IO::Socket::INET; my \\\\\\\$sock = IO::Socket::INET->new"
    . "(PeerAddr => \\\\\\\"$master_host\\\\\\\", PeerPort=> $master_port, "
    . "Proto =>'tcp', Timeout => $timeout); if(\\\\\\\$sock) { close(\\\\\\\$sock); "
    . "exit 3; } exit 0;\\\" \"";
  my $ret = system($command);
  $ret = $ret >> 8;
  if ( $ret == 0 ) {
    print
"Monitoring server $monitoring_server is reachable, Master is not reachable from $monitoring_server. OK.\n";
    next;
  }
  if ( $ret == 3 ) {
    if ( defined $ping_type
      && $ping_type eq $MHA::ManagerConst::PING_TYPE_INSERT )
    {
      my $ret_insert;
      my $command_insert =
          "ssh $MHA::ManagerConst::SSH_OPT_CHECK -p $ssh_port $ssh_user_host \'"
        . "/usr/bin/mysql -u$master_user -p$master_password -h$master_host "
        . "-e \"CREATE DATABASE IF NOT EXISTS infra; "
        . "CREATE TABLE IF NOT EXISTS infra.chk_masterha (\\`key\\` tinyint NOT NULL primary key,\\`val\\` int(10) unsigned NOT NULL DEFAULT '0'\) engine=MyISAM; "
        . "INSERT INTO infra.chk_masterha values (1,unix_timestamp()) ON DUPLICATE KEY UPDATE val=unix_timestamp()\"\'";
      my $sigalrm_timeout = 3;
      eval {
        local $SIG{ALRM} = sub {
          die "timeout.\n";
        };
        alarm $sigalrm_timeout;
        $ret_insert = system($command_insert);
        $ret_insert = $ret_insert >> 8;
        alarm 0;
      };
      if ( $@ || $ret_insert != 0 ) {
        print
"Monitoring server $monitoring_server is reachable, Master is not writable from $monitoring_server. OK.\n";
        next;
      }
    }
    print "Master is reachable from $monitoring_server!\n";
    $exit_code = 3;
    last;
  }
  else {
    print "Monitoring server $monitoring_server is NOT reachable!\n";
    $exit_code = 2;
    last;
  }
}

exit $exit_code;

# ############################################################################
# Documentation
# ############################################################################

=pod

=head1 NAME

masterha_secondary_check - Checking master availability from additional network routes

=head1 SYNOPSIS

masterha_secondary_check -s secondary_host1 -s secondary_host2 .. --user=ssh_username --master_host=host --master_ip=ip --master_port=port

See online reference (http://code.google.com/p/mysql-master-ha/wiki/Parameters#secondary_check_script) for details.

=head1 DESCRIPTION

See online reference (http://code.google.com/p/mysql-master-ha/wiki/Parameters#secondary_check_script) for details.

开辟项目sessionWeb的WebRoot目录下的META-INF文件夹(跟WEB-INF文件夹同级,如果没有则创立),打开context.xml(假设没有则开创),编辑内容如下:

 

    Person[] persons =

   
式,该动作仍会时有发生。但在backup-backup情势下,当主库修改,并运行keepalived后,并不会抢占新主的VIP,尽管原主的priority高于新主的。

 

    只需将配置文件中的priority设置为90

 

     # scp all.sql 192.168.244.20:/root/

既然WAP上多数的客户浏览器都不支持Cookie,索性禁止Session使用Cookie,统一行使UTiguanL地址重写会更好有的。Java
Web规范补助通过配备的法门禁止使用Cookie。上边举例说一下哪些通过布署禁止选取库克ie。

 

        byte[] strTemp =s.getBytes();                          //
获取字节

    # ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.244.30

           if(cookie.getName().equals(“account”))  // 如果Cookie名为    
                                                account

      一路按“Enter”

           <a href=”${ pageContext.request.requestURI
}?action=logout”>             注销</a>

    

很多网站都会使用Cookie。例如,谷歌会向客户端颁发Cookie,Baidu也会向客户端颁发Cookie。那浏览器访问谷歌(Google)会不会也带走上Baidu颁发的库克ie呢?恐怕谷歌能或无法修改Baidu颁发的库克ie呢?

 

               </tr>

    # tar xvf keepalived-1.2.24.tar.gz

        String password =request.getParameter(“password”);            
                                         // 获取password参数

     先在Master上启动

        MessageDigestmdTemp = MessageDigest.getInstance(“MD1”); //
获取MD1

八、
检查MHA Manager的状态

</Context>

    
很多童鞋对perl并不领会,觉得不能够出手,其实,完全能够调用其余脚本,譬如python,shell等。

        <formaction=”${ pageContext.request.requestURI
}?action=login”         method=”post”>

注:操作系统均为LX570HEL 6.7

Session是另一种记录客户处境的机制,差异的是Cookie保存在客户端浏览器中,而Session保存在服务器上。客户端浏览器访问服务器的时候,服务器把客户端音讯以某种情势记录在服务器上。这正是Session。客户端浏览器再度走访时只须求从该Session中寻找该客户的状态就足以了。

-- CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000002', MASTER_LOG_POS=120;

            }

柒 、查看全部集群的气象

</td>

     通过报错能够见到,是不非亲非故系注重包没有安装。

<td>

    # service rsyslog restart 

   

  1 #!/usr/bin/env perl
  2 
  3 #  Copyright (C) 2011 DeNA Co.,Ltd.
  4 #
  5 #  This program is free software; you can redistribute it and/or modify
  6 #  it under the terms of the GNU General Public License as published by
  7 #  the Free Software Foundation; either version 2 of the License, or
  8 #  (at your option) any later version.
  9 #
 10 #  This program is distributed in the hope that it will be useful,
 11 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
 12 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13 #  GNU General Public License for more details.
 14 #
 15 #  You should have received a copy of the GNU General Public License
 16 #   along with this program; if not, write to the Free Software
 17 #  Foundation, Inc.,
 18 #  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 19 
 20 ## Note: This is a sample script and is not complete. Modify the script based on your environment.
 21 
 22 use strict;
 23 use warnings FATAL => 'all';
 24 
 25 use Getopt::Long;
 26 use MHA::DBHelper;
 27 my (
 28   $command,        $ssh_user,         $orig_master_host,
 29   $orig_master_ip, $orig_master_port, $new_master_host,
 30   $new_master_ip,  $new_master_port,  $new_master_user,
 31   $new_master_password
 32 );
 33 
 34 GetOptions(
 35   'command=s'             => \$command,
 36   'ssh_user=s'            => \$ssh_user,
 37   'orig_master_host=s'    => \$orig_master_host,
 38   'orig_master_ip=s'      => \$orig_master_ip,
 39   'orig_master_port=i'    => \$orig_master_port,
 40   'new_master_host=s'     => \$new_master_host,
 41   'new_master_ip=s'       => \$new_master_ip,
 42   'new_master_port=i'     => \$new_master_port,
 43   'new_master_user=s'     => \$new_master_user,
 44   'new_master_password=s' => \$new_master_password,
 45 );
 46 
 47 exit &main();
 48 
 49 sub main {
 50   if ( $command eq "stop" || $command eq "stopssh" ) {
 51 
 52     # $orig_master_host, $orig_master_ip, $orig_master_port are passed.
 53     # If you manage master ip address at global catalog database,
 54     # invalidate orig_master_ip here.
 55     my $exit_code = 1;
 56     eval {
 57 
 58       # updating global catalog, etc
 59       $exit_code = 0;
 60     };
 61     if ($@) {
 62       warn "Got Error: $@\n";
 63       exit $exit_code;
 64     }
 65     exit $exit_code;
 66   }
 67   elsif ( $command eq "start" ) {
 68 
 69     # all arguments are passed.
 70     # If you manage master ip address at global catalog database,
 71     # activate new_master_ip here.
 72     # You can also grant write access (create user, set read_only=0, etc) here.
 73     my $exit_code = 10;
 74     eval {
 75       my $new_master_handler = new MHA::DBHelper();
 76 
 77       # args: hostname, port, user, password, raise_error_or_not
 78       $new_master_handler->connect( $new_master_ip, $new_master_port,
 79         $new_master_user, $new_master_password, 1 );
 80 
 81       ## Set read_only=0 on the new master
 82       $new_master_handler->disable_log_bin_local();
 83       print "Set read_only=0 on the new master.\n";
 84       $new_master_handler->disable_read_only();
 85 
 86       ## Creating an app user on the new master
 87       #print "Creating app user on the new master..\n";
 88       #FIXME_xxx_create_user( $new_master_handler->{dbh} );
 89       $new_master_handler->enable_log_bin_local();
 90       $new_master_handler->disconnect();
 91 
 92       ## Update master ip on the catalog database, etc
 93       my $cmd;
 94       $cmd = 'ssh '.$ssh_user.'@'.$orig_master_ip.' service keepalived stop';
 95       system($cmd);
 96       $exit_code = 0;
 97     };
 98     if ($@) {
 99       warn $@;
100 
101       # If you want to continue failover, exit 10.
102       exit $exit_code;
103     }
104     exit $exit_code;
105   }
106   elsif ( $command eq "status" ) {
107 
108     # do nothing
109     exit 0;
110   }
111   else {
112     &usage();
113     exit 1;
114   }
115 }
116 
117 sub usage {
118   print
119 "Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
120 }

该方法会自动判断客户端是否匡助Cookie。如若客户端帮助Cookie,会将U奥迪Q7L维持原状地输出来。要是客户端不支持Cookie,则会将用户Session的id重写到U奇骏L中。重写后的输出或然是那样的:

Wed Jul 20 14:33:36 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.
Wed Jul 20 14:33:36 2016 - [info] Reading application default configuration from /etc/masterha/app1.cnf..
Wed Jul 20 14:33:36 2016 - [info] Reading server configuration from /etc/masterha/app1.cnf..
Wed Jul 20 14:33:36 2016 - [info] Starting SSH connection tests..
Wed Jul 20 14:33:51 2016 - [debug] 
Wed Jul 20 14:33:36 2016 - [debug]  Connecting via SSH from root@192.168.244.10(192.168.244.10:22) to root@192.168.244.20(192.168.244.20:22)..
Wed Jul 20 14:33:48 2016 - [debug]   ok.
Wed Jul 20 14:33:48 2016 - [debug]  Connecting via SSH from root@192.168.244.10(192.168.244.10:22) to root@192.168.244.30(192.168.244.30:22)..
Wed Jul 20 14:33:50 2016 - [debug]   ok.
Wed Jul 20 14:33:55 2016 - [debug] 
Wed Jul 20 14:33:37 2016 - [debug]  Connecting via SSH from root@192.168.244.30(192.168.244.30:22) to root@192.168.244.10(192.168.244.10:22)..
Wed Jul 20 14:33:49 2016 - [debug]   ok.
Wed Jul 20 14:33:49 2016 - [debug]  Connecting via SSH from root@192.168.244.30(192.168.244.30:22) to root@192.168.244.20(192.168.244.20:22)..
Wed Jul 20 14:33:54 2016 - [debug]   ok.
Wed Jul 20 14:33:55 2016 - [debug] 
Wed Jul 20 14:33:36 2016 - [debug]  Connecting via SSH from root@192.168.244.20(192.168.244.20:22) to root@192.168.244.10(192.168.244.10:22)..
Wed Jul 20 14:33:49 2016 - [debug]   ok.
Wed Jul 20 14:33:49 2016 - [debug]  Connecting via SSH from root@192.168.244.20(192.168.244.20:22) to root@192.168.244.30(192.168.244.30:22)..
Wed Jul 20 14:33:54 2016 - [debug]   ok.
Wed Jul 20 14:33:55 2016 - [info] All SSH connection tests passed successfully.

<jsp:directive.page import=”java.text.SimpleDateFormat”/>

葡京赌场网址 26葡京赌场网址 27

               <tr><td>您的全名:</td>

时至明天,MHA部分计划达成,上面,来配置VIP。

升迁:Cookie中保存汉语只可以编码。一般选取UTF-8编码即可。不引进应用GBK等华语编码,因为浏览器不必然支持,而且JavaScript也不协理GBK编码。

 

提示:secure属性并不可能对Cookie内容加密,因此不能保险相对的安全性。假如急需高安全性,内需在先后中对Cookie内容加密、解密,防止泄密。

     # vim /etc/keepalived/keepalived.conf

1.2.6  Session对浏览器的需求

 

1.2  Session机制

 

                   <td><inputtype=”radio” name=”timeout”
value=”-1″                    checked> 关闭浏览器即失效 <br/>
<input type=”radio”                    name=”timeout” value=”<%=
30 \*24 \* 60 \* 60 %>”> 30天    
               内有效 <br/><input type=”radio” name=”timeout”
value=                    “<%= Integer.MAX_VALUE %>”> 永久有效
<br/> </td> </tr>

0 4 * * * /usr/local/bin/purge_relay_logs --user=monitor --password=monitor123 -disable_relay_log_purge --workdir=/tmp/ >> /tmp/purge
_relay_logs.log 2>&1

 

     # cd mha4mysql-manager-0.56

    }

        –host: mysqlserver地址

 

    检查通过~

在先后中,会话跟踪是很重点的事情。理论上,一个用户的保有请求操作都应当属于同八个会话,而另三个用户的具备请求操作则应该属于另三个对话,二者无法歪曲。例如,用户A在商城选购的其余货物都应该放在A的购物车内,不论是用户A什么时间购买的,那都是属于同一个对话的,不可能放入用户B或用户C的购物车内,那不属于同三个会话。

      # yum install perl-DBD-MySQL -y

图1.8  使用Session记录用户新闻

     # make install

1.2.3  Session的生命周期

其实生育环境中,推荐那种方法来保管VIP,可使得防患脑裂景况的产生。

IE浏览器会在“C:\Documents and
Settings\您的用户名\Cookies”文件夹下以文件文件情势保留,叁个文书文件保留三个Cookie。

      MHA在发出切换进程中,从库在还原的历程中,重视于relay
log的连锁音信,所以大家那里要将relay
log的自发性清楚设置为OFF,选择手动清楚relay log的法门。

               session.setAttribute(“person”, person);                  
// 保存登录的Person

     # scp all.sql 192.168.244.30:/root/

        byte[] md =mdTemp.digest();                        // 加密

葡京赌场网址 28葡京赌场网址 29

 

     # tar xvf mha4mysql-manager-0.56.tar.gz 

   

 

            <table>

    # cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

一旦maxAge为0,则意味着删除该库克ie。Cookie机制没有提供删除Cookie的点子,由此通过安装该库克ie即时失效达成删除Cookie的效率。失效的Cookie会被浏览器从Cookie文件可能内部存款和储蓄器中删除,

 

葡京赌场网址 30

local0.*           /var/log/keepalived.log

 

另有如下多少个脚本需自定义:

               </tr>

      # cd mha4mysql-node-0.56

    }

Slave                           192.168.244.30   3                 读

抑或涂改汤姆cat全局的conf/context.xml,修改内容如下:

 

        <% if(login){%>

     # masterha_check_repl –conf=/etc/masterha/app1.cnf

留神程序中Session中一向保存了Person类对象与Date类对象,使用起来要比Cookie方便。

save_binary_logs:保存或复制master的二进制日志

Session对应的类为javax.servlet.http.HttpSession类。各种来访者对应二个Session对象,全体该客户的情状消息都保留在这么些Session对象里。Session对象是在客户端第3次呼吁服务器的时候创制的。Session也是一种key-value的属性对,通过getAttribute(Stringkey)和setAttribute(String
key,Objectvalue)方法读写客户境况消息。Servlet里通过request.getSession()方法取得该客户的Session,

角色                             IP地址                 ServerID    
 类型

 

壹 、在全部节点上设置MHA node

汉语与英文字符不相同,粤语属于Unicode字符,在内部存款和储蓄器中占五个字符,而英文属于ASCII字符,内部存款和储蓄器中只占一个字节。Cookie中运用Unicode字符时须要对Unicode字符举行编码,不然会乱码。

         # purge_relay_logs –user=monitor –password=monitor123
-disable_relay_log_purge –workdir=/tmp/

       // 基础数据,保存五个人的音信

       8. 在Master中成立监察和控制用户

    }

 

1.1.12  JavaScript操作Cookie

       6. 在Slave上搭建从库

cookie.setPath(“/session/”);                          // 设置路径

      # nohup masterha_manager –conf=/etc/masterha/app1.cnf
–remove_dead_master_conf –ignore_last_failover < /dev/null
> /masterha/app1/manager.log 2>&1 &

            </table>

*** Module::AutoInstall version 1.03
*** Checking for Perl dependencies...
[Core Features]
- DBI                   ...loaded. (1.609)
- DBD::mysql            ...loaded. (4.013)
- Time::HiRes           ...missing.
- Config::Tiny          ...missing.
- Log::Dispatch         ...missing.
- Parallel::ForkManager ...missing.
- MHA::NodeConst        ...missing.
==> Auto-install the 5 mandatory module(s) from CPAN? [y] y
*** Dependencies will be installed the next time you type 'make'.
*** Module::AutoInstall configuration finished.
Checking if your kit is complete...
Looks good
Warning: prerequisite Config::Tiny 0 not found.
Warning: prerequisite Log::Dispatch 0 not found.
Warning: prerequisite MHA::NodeConst 0 not found.
Warning: prerequisite Parallel::ForkManager 0 not found.
Warning: prerequisite Time::HiRes 0 not found.
Writing Makefile for mha4mysql::manager

        Cookie ssidCookie =new Cookie(“ssid”, ssid);   // 新建Cookie

    # cd keepalived-1.2.24

%>

purge_relay_logs:解决中继日志(不会杜绝SQL线程)

    private static final String KEY =”:cookie@helloweenvsfei.com”;    
                                                 // 密钥 

#!/usr/bin/perl

#  Copyright (C) 2011 DeNA Co.,Ltd.
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#  Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

## Note: This is a sample script and is not complete. Modify the script based on your environment.

use strict;
use warnings FATAL => 'all';
use Mail::Sender;
use Getopt::Long;

#new_master_host and new_slave_hosts are set only when recovering master succeeded
my ( $dead_master_host, $new_master_host, $new_slave_hosts, $subject, $body );
my $smtp='smtp.126.com';
my $mail_from='slowtech@126.com';
my $mail_user='slowtech@126.com';
my $mail_pass='xxxxx';
my $mail_to=['slowtech@126.com'];
GetOptions(
  'orig_master_host=s' => \$dead_master_host,
  'new_master_host=s'  => \$new_master_host,
  'new_slave_hosts=s'  => \$new_slave_hosts,
  'subject=s'          => \$subject,
  'body=s'             => \$body,
);
mailToContacts($smtp,$mail_from,$mail_user,$mail_pass,$mail_to,$subject,$body);

sub mailToContacts {
    my ( $smtp, $mail_from, $user, $passwd, $mail_to, $subject, $msg ) = @_;
    open my $DEBUG, "> /tmp/monitormail.log"
        or die "Can't open the debug      file:$!\n";
    my $sender = new Mail::Sender {
        ctype       => 'text/plain; charset=utf-8',
        encoding    => 'utf-8',
        smtp        => $smtp,
        from        => $mail_from,
        auth        => 'LOGIN',
        TLS_allowed => '0',
        authid      => $user,
        authpwd     => $passwd,
        to          => $mail_to,
        subject     => $subject,
        debug       => $DEBUG
    };

    $sender->MailMsg(
        {   msg   => $msg,
            debug => $DEBUG
        }
    ) or print $Mail::Sender::Error;
    return 1;
}



# Do whatever you want here
exit 0;

 

    # make install

假定maxAge为负数,则象征该库克ie仅在本浏览器窗口以及本窗口打开的子窗口内有效,关闭窗口后该Cookie即失效。maxAge为负数的Cookie,为权且性Cookie,不会被持久化,不会被写到Cookie文件中。Cookie新闻保存在浏览器内部存储器中,由此关门浏览器该Cookie就烟消云散了。库克ie私下认可的maxAge值为–1。

    # scp /etc/keepalived/keepalived.conf
192.168.244.20:/etc/keepalived/

<%

 

 

作用跟response.encodeU智跑L(String
url)是千篇一律的:假设客户端帮衬Cookie,生成原U库罗德L地址,借使不帮忙Cookie,传回重写后的涵盖jsessionid字符串的地方。

       ssidCookie.setMaxAge(0);                   // 设置有效期为0,删除

<Context cookies=”false”>

   request.setCharacterEncoding(“UTF-8”);             // 设置request编码

1.2.5  Session的常用方法

       

由于HTTP是一种无状态的合计,服务器单从网络连接上得不到知道客户身份。怎么做呢?就给客户端们颁发1个通行证吧,每人贰个,无论哪个人访问都无法不引导本身通行证。那样服务器就能从通行证上确认客户身份了。那便是Cookie的干活原理

%>

本例将使用另一种方案,只在报到时查询3回数据库,以后访问验证登录音信时不再查询数据库。达成格局是把账号遵照一定的平整加密后,连同账号一块保存到库克ie中。下次作客时只必要看清账号的加密规则是还是不是正确即可。本例把账号保存到名为account的Cookie中,把账号连同密钥用MD1算法加密后保存到名为ssid的Cookie中。验证时验证Cookie中的账号与密钥加密后是或不是与Cookie中的ssid相等。相关代码如下:

1.1.8  Cookie的修改、删除

        CookieaccountCookie = new Cookie(“account”, “”);            
                                     // 新建Cookie,内容为空

    Date loginTime
=(Date)session.getAttribute(“loginTime”);                     //
获取登录时间

配备后TOMCAT便不会自动生成名JSESSIONID的Cookie,Session也不会以Cookie为识别标志,而唯有以重写后的U库罗德L地址为识别标志了。

               </tr>

        return;

    // … 部分HTML代码略

       response.addCookie(accountCookie);         // 输出到客户端

即使如此Session保存在服务器,对客户端是晶莹的,它的平常化运维依然要求客户端浏览器的支撑。那是因为Session需求使用Cookie作为识别标志。HTTP协议是无状态的,Session不可能依照HTTP连接来判断是不是为同样客户,因此服务器向客户端浏览器发送三个名为JSESSIONID的Cookie,它的值为该Session的id(也等于HttpSession.getId()的再次来到值)。Session依照该库克ie来分辨是或不是为同一用户。

 

<%@ page language=”java” pageEncoding=”UTF-8″%>

    DateFormat dateFormat = newSimpleDateFormat(“yyyy-MM-dd”);        
// 日期格式化器

cookie.setPath(“/”);                              // 设置路径

            欢迎您, ${ cookie.account.value }.   

Cookie cookie = new Cookie(“username”,”helloweenvsfei”);   // 新建Cookie

    {          

%>

       try {

               <tr>

        CookieaccountCookie = new Cookie(“account”, account);        
                                             // 新建Cookie

out.println(“登录时间为:”
+(Date)session.getAttribute(“loginTime”));      // 获取Session属性

               // 登录成功,设置将用户的新闻以及登录时间保存到Session

Session在用户率先次访问服务器的时候自动成立。供给专注唯有访问JSP、Servlet等主次时才会创设Session,只访问HTML、IMAGE等静态财富并不会创设Session。要是没有生成Session,也足以动用request.getSession(true)强制生成Session。

<!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01Transitional//EN”>

               account = cookie.getValue();       // 保存account内容

假使maxAge属性为正数,则意味着该Cookie会在maxAge秒之后自动失效。浏览器会将maxAge为正数的Cookie持久化,即写到对应的库克ie文件中。无论客户关闭了浏览器照旧电脑,只要还在maxAge秒此前,登录网站时该Cookie仍然有效。上边代码中的Cookie音讯将永久有效。

               </tr>

               </tr>

 

%>

瞩目:页面只可以得到它属于的Path的Cookie。例如/session/test/a.jsp无法收获到路径为/session/abc/的Cookie。使用时一定要留意。

               <tr><td>密码: </td>

Cookie实际上是一小段的文书新闻。客户端请求服务器,假设服务器须求记录该用户景况,就选择response向客户端浏览器颁发八个Cookie。客户端浏览器会把Cookie保存起来。当浏览器再请求该网站时,浏览器把请求的网址连同该Cookie一同提交给服务器。服务器检查该库克ie,以此来分辨用户情形。服务器还足以依据须要修改Cookie的始末。

Cookie并不提供修改、删除操作。假设要修改有些Cookie,只须求新建四个同名的Cookie,添加到response中覆盖原来的Cookie。

<session-config>

       
   if(person.getName().equalsIgnoreCase(request.getParameter(“username”))&&person.getPassword().equals(request.getParameter(“password”)))

               <tr><td>您的生日:</td>

保存登录音信有各类方案。最直接的是把用户名与密码都维持到Cookie中,下次作客时检查Cookie中的用户名与密码,与数据库相比较。那是一种比较危险的选项,一般不把密码等根本消息保存到Cookie中

 

   
   response.sendRedirect(response.encodeRedirectURL(“administrator.jsp”));

 

还有一种方案是把密码加密后保存到Cookie中,下次做客时解密并与数据库相比较。那种方案略微安全一些。如若不指望保留密码,还足以把登录的小运戳保存到库克ie与数据库中,到时只验证用户名与登录时间戳就足以了。

 

               return;

Cookie cookie = new Cookie(“time”,”20080808″);     // 新建Cookie

%>

         str[k++] =hexDigits[byte0 >>> 4 & 0xf];

    }

    // … HTML代码为一个FOEnclaveM表单,代码略,请看随书光盘

    if(“administrator”.equals(userName))

表1.1  Cookie常用属性

<jsp:directive.page import=”java.text.DateFormat”/>

        String account =request.getParameter(“account”);            
                                         // 获取account参数

 

        String ssid =calcMD1(account + KEY); //
把账号、密钥使用MD1加密后保存

Cookie cookie = new Cookie(“username”,”helloweenvsfei”);   //
新建Cookie

        // 如果是POST登录       

                   <td><input type=”submit”value=” 登  录 ”
class=                    “button”></td>

 

若是是页面重定向(Redirection),U奥迪Q5L地址重写能够这么写:

库克ie对象使用key-value属性对的花样保留用户情状,三个Cookie对象保存1个属性对,1个request大概response同时利用七个Cookie。因为Cookie类位于包javax.servlet.http.\*上边,所以JSP中不需求import该类。

代码1.8 loginCookie.jsp

session.setAttribute(“loginTime”, new Date());     //
设置Session中的属性

瞩目:domain参数必须以点(“.”)初步。别的,name相同但domain分化的八个Cookie是四个分歧的Cookie。借使想要七个域名完全两样的网站共有Cookie,能够生成八个Cookie,domain属性分别为四个域名,输出到客户端。

假设客户端浏览器将Cookie效用禁止使用,大概不协助Cookie如何是好?例如,绝超越八分之四的手提式有线电话机浏览器都不协理Cookie。Java
Web
提供了另一种缓解方案:U劲客L地址重写。

而外运用Cookie,Web应用程序中还时常应用Session来记录客户端状态。Session是劳动器端使用的一种记录客户端状态的建制,使用上比Cookie简单一些,相应的也充实了服务器的贮存压力

        login =ssid.equals(calcMD1(account + KEY));                   
                   // 假如加密规则正确, 则视为已经报到

若果用户是在祥和家的处理器上上网,登录时就能够记住他的记名消息,下次作客时不供给再行登录,直接待上访问即可。完毕方式是把登录消息如账号、密码等保存在Cookie中,并操纵Cookie的有效期,下次作客时再验证Cookie中的登录消息即可。

        // 重新请求本页面,参数中涵盖时间戳,禁止浏览器缓存页面内容

唤醒:该加密机制中最重点的一部分为算法与密钥。由于MD1算法的不可逆性,固然用户精通了账号与加密后的字符串,也不恐怕解密获得密钥。因而,只要保管好密钥与算法,该机制就是安全的。

HttpSession session = request.getSession();       // 获取Session对象

<%

     };

                   <td><inputtype=”password”
name=”password”></td>

    String action =request.getParameter(“action”); // 获取action参数

               </tr>

           if(cookie.getName().equals(“ssid”)) // 如果为SSID

<Context path=”/sessionWeb”cookies=”false”>

cookie.setSecure(true);                           // 设置安全品质

   

response.addCookie(cookie);                        // 输出到客户端

1.1.4  Unicode编码:保存中文

        for (int i = 0; i< j; i++) {                       //
循环输出

       String s = ss==null ?”” : ss;                  // 若为null返回空

<script>document.write(document.cookie);</script>

        }

       char hexDigits[] = { ‘0’,’1′, ‘2’, ‘3’, ‘4’, ‘1’, ‘6’, ‘7’,
‘8’, ‘9’,        ‘a’, ‘b’, ‘c’, ‘d’, ‘e’, ‘f’ };                       
// 字典

                   <td>有效期: </td>

Cookie cookie = new Cookie(“time”,”20080808″); // 新建Cookie

1.2.4  Session的有效期

表1.2  HttpSession的常用方法

    if(account != null && ssid !=null){    // 假使account、SSID都不为空

         str[k++] =hexDigits[byte0 & 0xf];

 

       

除却name与value之外,库克ie还具有任何多少个常用的性质。各个属性对应2个getter方法与贰个setter方法。库克ie类的全部属性如表1.1所示。

HTTP协议不仅是无状态的,而且是不安全的。使用HTTP协议的数码不通过其他加密就径直在互连网上盛传,有被收缴的或是。使用HTTP协议传输很隐衷的内容是一种隐患。借使不指望库克ie在HTTP等非安全协议中传输,能够安装Cookie的secure属性为true。浏览器只会在HTTPS和SSL等安全协议中传输此类Cookie。上边包车型大巴代码设置secure属性为true: