mysql高可用架构 -> MHA配置VIP漂移-05

时间：2023-04-05 17:16:11

VIP漂移的两种方式

1）通过keepalived的方式，管理虚拟IP的漂移

2）通过MHA自带脚本方式，管理虚拟IP的漂移

MHA脚本方式

虚拟ip漂移的脚本下载地址 -> wget http://download.driverzeng.com/master_ip_failover

如果是wget下载的脚本，需要转换格式:   [root@db03 mha]#  dos2unix master_ip_failover

脚本内容如下

[root@db03 ~]# cat /usr/local/bin/master_ip_failover

#!/usr/bin/env perl

use strict;

use warnings FATAL => 'all';

use Getopt::Long;

my (

    $command,          $ssh_user,        $orig_master_host, $orig_master_ip,

    $orig_master_port, $new_master_host, $new_master_ip,    $new_master_port

);

my $vip = '10.0.0.55/24';

my $key = '0';

my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";

my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";

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,

);

exit &main();

sub main {

    print "\n\nIN SCRIPT TEST====$ssh_stop_vip==$ssh_start_vip===\n\n";

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

        my $exit_code = 1;

        eval {

            print "Disabling the VIP on 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" ) {

        my $exit_code = 10;

        eval {

            print "Enabling the VIP - $vip on the new master - $new_master_host \n";

            &start_vip();

            $exit_code = 0;

        };

        if ($@) {

            warn $@;

            exit $exit_code;

        }

        exit $exit_code;

    }

    elsif ( $command eq "status" ) {

        print "Checking the Status of the script.. OK \n";

        exit 0;

    }

    else {

        &usage();

        exit 1;

    }

}

sub start_vip() {

    `ssh $ssh_user\@$new_master_host \" $ssh_start_vip \"`;

}

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";

}

编辑脚本

#根据配置文件中脚本路径编辑

[root@mysql-db03 ~]# vim /etc/mha/master_ip_failover

#修改以下几行内容

my $vip = '10.0.0.55/24';

my $key = '';

my $ssh_start_vip = "/sbin/ifconfig eth0:$key $vip";

my $ssh_stop_vip = "/sbin/ifconfig eth0:$key down";

#添加执行权限，否则mha无法启动

[root@mysql-db03 ~]# chmod +x /etc/mha/master_ip_failover

修改配置文件

#编辑配置文件

[root@mysql-db03 ~]# vim /etc/mha/app1.cnf

#在[server default]标签下添加

[server default]

master_ip_failover_script=/usr/local/bin/master_ip_failover   //添加使用MHA自带脚本

手动绑定VIP

#绑定vip

[root@mysql-db01 ~]# ifconfig eth0:0 10.0.0.55/24

[root@db01 bin]# ifconfig eth0:0 down      //解绑vip

#查看vip

[root@mysql-db01 ~]# ip a |grep eth0

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

   inet 10.0.0.51/24 brd 10.0.0.255 scope global eth0

   inet 10.0.0.55/24 brd 10.0.0.255 scope global secondary eth0:0

　　

测试ip漂移

#登录db02

[root@mysql-db02 ~]# mysql

#查看slave信息

mysql> show slave status\G

*************************** . row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 10.0.0.51                    //主库是51

                  Master_User: rep

                  Master_Port:

                Connect_Retry:

              Master_Log_File: mysql-bin.

          Read_Master_Log_Pos:

               Relay_Log_File: mysql-db02-relay-bin.

                Relay_Log_Pos:

        Relay_Master_Log_File: mysql-bin.

             Slave_IO_Running: Yes

            Slave_SQL_Running: Yes

#停掉主库

[root@mysql-db01 ~]# systemctl stop mysqld                 //停掉主库Mysql测试

#在db03上查看从库slave信息

mysql> show slave status\G

*************************** . row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 10.0.0.52                   //主库切换到52

                  Master_User: rep

                  Master_Port:

                Connect_Retry:

              Master_Log_File: mysql-bin.

          Read_Master_Log_Pos:

               Relay_Log_File: mysql-db03-relay-bin.

                Relay_Log_Pos:

        Relay_Master_Log_File: mysql-bin.

             Slave_IO_Running: Yes

            Slave_SQL_Running: Yes

#在db01上查看vip信息

[root@mysql-db01 ~]# ip a |grep eth0     //vip没有了

: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP qlen

inet 10.0.0.51/ brd 10.0.0.255 scope global eth0

#在db02上查看vip信息

[root@mysql-db02 ~]# ip a |grep eth0    //db02出现vip55

: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu  qdisc pfifo_fast state UP qlen

    inet 10.0.0.52/ brd 10.0.0.255 scope global eth0

    inet 10.0.0.55/ brd 10.0.0.255 scope global secondary eth0:


nohup masterha_manager --conf=/etc/mha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/mha/app1/manager.log >& & 
//后台运行mha

masterha_check_repl --conf=/etc/mha/app1.cnf                         //测试mha复制

[root@db03 mha]# masterha_check_status --conf=/etc/mha/app1.cnf       //检测mha状态，db03查看主库是否切换52

app1 (pid:) is running(:PING_OK), master:10.0.0.52

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