MySQL HA MHA Configuration

keepalived.conf

! Configuration File for keepalived

global_defs {
router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER #candidate master则写BACKUP
    interface eth2
    virtual_router_id 51 #同一个集群这个东西是一样的
    priority 100 #从254到1，master > candidate master
    advert_int 1
    nopreempt
    authentication { #认证账号，同一个集群一样
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress { 
        10.20.78.11 # 虚拟ip, 主挂了，飘给备
 }
}

mha-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 = '10.20.78.11';
my $ssh_start_vip = "/etc/init.d/keepalived start";
my $ssh_stop_vip = "/etc/init.d/keepalived stop";
 
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";
        #`ssh $ssh_user\@cluster1 \" $ssh_start_vip \"`;
        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=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";
}

mha.conf

[server default]
# 访问三台 MySQL 的用户名和密码,
# mha-manager 需要做一些诸如 Start Slave 等主从同步的操作
user=repl_username
password=repl_password
ssh_user=root

# working directory on the manager
manager_workdir=/usr/local/mha
manager_workdir=/var/log/masterha

# working directory on MySQL servers
# 同步的用户名和密码
remote_workdir=/usr/local/mha
repl_user=repl_username
repl_password=repl_password

# master 失效转移的处理脚本
master_ip_failover_script=/usr/local/mha/master_ip_failover

[server1]
hostname=10.20.78.241

[server2]
hostname=10.20.78.243
candidate_master=1 # master 宕掉后只选择该服务为新的 master

[server3]
hostname=10.20.78.245
no_master=1 # 该 MySQL 永远不做 master