环境

1主2从，manager放在从库

主库：192.168.137.201

从库（manager ）：192.168.137.202

从库：192.168.137.203

需要的软件包：

epel-release-7-10.noarch.rpm

mha4mysql-node-0.56.tar.gz

mha4mysql-manager-0.56.tar.gz

mysql-5.7.14-linux-glibc2.5-x86_64.tar.gz

主从搭建

创建用户

create user 'repl'@'%' identified by 'repl';

grant all on *.* to'repl'@'%';

create user 'root'@'%' identified by 'root';

grant all on *.* to'root'@'%';

建立主从

CHANGE MASTER TO

MASTER_HOST='192.168.137.201',

MASTER_USER='repl',

MASTER_PASSWORD='repl',

MASTER_PORT=3306,

master_auto_position=1;

配置ssh互相信任

c1服务器

[root@c1 ~]# ssh-keygen -t rsa

[root@c1 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.137.201

[root@c1 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.137.202

[root@c1 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.137.203

c2服务器

[root@c2 ~]# ssh-keygen -t rsa

[root@c2 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.137.201

[root@c2 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.137.202

[root@c2 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.137.203

c3服务器

[root@c3 ~]# ssh-keygen -t rsa

[root@c3 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.137.201

[root@c3 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.137.202

[root@c3 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub root@192.168.137.203

安装MHA软件

安装epel源（所有节点）

centos6

rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

centos7

rpm -ivh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-10.noarch.rpm

安装MHA软件

安装依赖包（所有节点）

yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-Time-HiResperl-ExtUtils-CBuilder perl-ExtUtils-MakeMakerperl-CPANnet-tools -y

epel源的所有epel，epel-debuginfo，epel-source，都启用

软件下载

MHA软件下载

https://downloads.mariadb.com/MHA/

https://github.com/yotoobo/linux/tree/master/mha

安装MHA-node（所有节点）

tar zxf mha4mysql-node-0.56.tar.gz

cd mha4mysql-node-0.56

perl Makefile.PL

make && make install

安装MHA-manager（202）

tar zxf mha4mysql-manager-0.56.tar.gz

cd mha4mysql-manager-0.56

perl Makefile.PL

make && make install

配置MHA-manager-conf文件（202）

vi /data/mha/3306/log/mha.cnf

[server default]

client_bindir=/usr/local/mysql/bin/

manager_log=/data/mha/3306/log/manager.log

manager_workdir=/data/mha/3306/log

master_binlog_dir=/data/mysql/mysql3306/logs

master_ip_failover_script=/usr/local/bin/master_ip_failover

master_ip_online_change_script=/usr/local/bin/master_ip_online_change

report_script=/usr/local/bin/send_report

#init_conf_load_script=/usr/local/bin/load_cnf

remote_workdir=/data/mysql/mysql3306/tmp

#secondary_check_script= /usr/local/bin/masterha_secondary_check -s 192.168.137.201 -s 192.168.137.202

user=root

password=root

ping_interval=3

repl_user=repl

repl_password=repl

ssh_port=22

ssh_user=root

#max_ping_errors=40

[server1]

hostname=192.168.137.201

port=3306

[server2]

#check_repl_delay=0

hostname=192.168.137.202

port=3306

[server3]

candidate_master=1

check_repl_delay=0

hostname=192.168.137.203

port=3306

设置从库readonly（所有从库）

mysql> show global variables like "%read_only%";

mysql> flush tables with read lock;

mysql> set global read_only=1;

mysql> show global variables like "%read_only%";

拷贝脚本

cp /usr/local/mha_manager/samples/scripts/master_ip_failover /usr/local/bin/

cp /usr/local/mha_manager/samples/scripts/master_ip_online_change /usr/local/bin/

cp /usr/local/mha_manager/samples/scripts/power_manager /usr/local/bin/

cp /usr/local/mha_manager/samples/scripts/send_report /usr/local/bin/

修改master_ip_failover脚本

原脚本中无VIP切换

#!/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

);

my $vip='192.168.137.88/24';

my $key="1";

my $ssh_start_vip ="/sbin/ifconfig ens33:$key $vip";

my $ssh_stop_vip="/sbin/ifconfig ens33:$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 {

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 $@;

# If you want to continue failover, exit 10.

exit $exit_code;

}

exit $exit_code;

}

elsif ( $command eq "status" ) {

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

# do nothing

exit 0;

}

else {

&usage();

exit 1;

}

}

sub start_vip(){

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

}

sub stop_vip(){

`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";

}

检测配置文件（202节点）

[root@c2 ~]#masterha_check_repl --conf=/data/mha/3306/log/mha.cnf

主库添加VIP

[root@c1 ~]#ifconfig ens33:1 192.168.137.88/16

或者/sbin/ip addr add 192.168.137.88/32dev ens33

删除VIP ifconfig ens33:1 down

/sbin/ip addr del 192.168.137.88/32dev ens33

MHA manager启动和关闭

[root@c2 ~]# nohup masterha_manager --conf=/data/mha/3306/log/mha.cnf < /dev/null > /data/mha/3306/log/manager.log 2>&1 &

[root@c2 ~]# masterha_stop --conf=/data/mha/3306/log/mha.cnf

注意项

所有主从数据完全一致，包含业务数据和系统表数据，不然会导致故障切换途中，无法切到新主库中

切换VIP时，需要各个服务器都有net-tools包，能够执行ifconfig