mysql mha自动切换_mha+mysql自动切换

manager:192.168.2.254

master:192.168.2.252

slave:192.168.2.253

VIP:192.168.2.144

操作系统：centos6.5 64位

1.配置ssh互信(root用户 每台都执行)

# ssh-keygen

# ssh-copy-id 192.168.2.252

# ssh-copy-id 192.168.2.253

# ssh-copy-id 192.168.2.254

2.在manager节点上安装mha

# yum install epel-release

# yum install perl-DBD-MySQL

# yum install perl-Config-Tiny

# yum install perl-Log-Dispatch

# yum install perl-Parallel-ForkManager

# rpm -ivh mha4mysql-node-0.56-0.el6.noarch.rpm

# rpm -ivh mha4mysql-manager-0.56-0.el6.noarch.rpm

3.在node节点上装Mha(也就是master和slave上)

# yum install epel-release

# yum install perl-DBD-MySQL

4.安装配置mysql半同步插件(master和slave都操作)

mysql> install plugin rpl_semi_sync_master soname 'semisync_master.so';

mysql> install plugin rpl_semi_sync_slave soname 'semisync_slave.so';

[mysqld]

rpl_semi_sync_master_enabled=1

rpl_semi_sync_master_timeout=1000

rpl_semi_sync_slave_enabled=1

relay_log_purge=0

skip-name-resolve

server-id = 1 //只是这个参数不一样

log-bin=mysql-bin

read_only=1

slave-skip-errors=1396

在master和slave节点做软连接，否则可能会报错

ln -s /usr/local/mysql/bin/* /usr/bin/

masterha_check_repl --conf=/root/masterha/app1.cnf

masterha_check_ssh --conf=/root/masterha/app1.cnf

5.在master和slave里搭建主从mysql环境

此处略1万行

6.配置管理的MHA

[server default]

manager_workdir=/root/masterha

manager_log=/root/masterha/manager.log

user=root

password=redhat

ssh_user=root

repl_user=webslave

repl_password=redhat

ping_interval=1

shutdown_script=""

master_ip_online_change_script=""

master_ip_failover_script="/root/masterha/master_ip_failover"

report_script=""

[server1]

hostname=192.168.2.252

master_binlog_dir=/usr/local/mysql/data

candidate_master=1

[server2]

hostname=192.168.2.253

master_binlog_dir=/usr/local/mysql/data

candidate_master=1

[server3]

hostname=192.168.2.248

master_binlog_dir=/usr/local/mysql/data

candidate_master=1

master_ip_failover 脚本内容如下:

#!/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, $new_master_user,

$new_master_password

);

my $vip = '192.168.2.144/24'; # Virtual IP

my $key = '1';

my $gateway = '192.168.2.1';

my $ssh_start_vip = "sudo /sbin/ifconfig eth0:$key $vip;sudo /sbin/arping -I eth0 -c 3 -s $vip $gateway >/dev/null 2>&1";

my $ssh_stop_vip = "sudo /sbin/ifconfig eth0:$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" ) {

# $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 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" ) {

# 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 {

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;

}

}

# A simple system call that enable the VIP on the new master

sub start_vip() {

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

}

# A simple system call that disable the VIP on the old_master

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=po

rt ?new_master_host=host ?new_master_ip=ip ?new_master_port=port\n";

}

7.MHA启动及基本维护

nohup masterha_manager --conf=/root/masterha/app1.cnf > /tmp/mha_manager.log &1 & --这是启动

masterha_check_ssh --conf=/root/masterha/app1.cnf --查看ssh互信是否正常

masterha_check_repl --conf=/root/masterha/app1.cnf --查看主从复制是否正常

masterha_stop --conf=/root/masterha/app1.cnf --停止

8.测试

1.主库断电

2.主库断网

3.主库重启

4.主库关机

以上情况都测试过都能自动切换~

请看日志分析切换过程

9.主库模拟故障后的恢复

在mha的日志里查看

Sat Jun 13 19:31:17 2015 - [info] All other slaves should start replication from here. Statement should be:

CHANGE MASTER TO MASTER_HOST='192.168.2.253', MASTER_PORT=3306, MASTER_LOG_FILE='binlog.000003', MASTER_LOG_POS=120, MASTER_USER='webslave', MASTER_PASSWORD='xxx';

然后再就得主库里执行下,再start slave ,然后就得主库就变为了新的主库的从库了。

记得看下show slave status\G;