mysql中MHA如何搭建

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操作系统 ：

debian5.0.2

数据库版本：

mysql5.0.51a

结构：

manager : 192.168.1.136(M1)

master : 192.168.1.20:3306(N1)

slave1 :  192.168.1.20:3307(N2)

slave2 :  192.168.1.20:3308(N3)

slave3 :  192.168.1.20:3309(N4)

软件包准备：

mha4mysql-manager_0.55-1_all.deb(还有对应的二进制包，源码包)

mha4mysql-node_0.54-1_all.deb

准备就绪：

①安装依赖包

apt-get install libdbd-mysql-perl

apt-get install libconfig-tiny-perl

apt-get install liblog-dispatch-perl

apt-get install libparallel-forkmanager-perl

centos版(yum install perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager)

②安装mha manager包和node包

M1：dpkg -i mha4mysql-manager_0.55-1_all.deb

N1：dpkg -i mha4mysql-node_0.54-1_all.deb

N2：dpkg -i mha4mysql-node_0.54-1_all.deb

N3：dpkg -i mha4mysql-node_0.54-1_all.deb

N4：dpkg -i mha4mysql-node_0.54-1_all.deb

③主机信任(由于公司环境的原因，这里使用的是mysql用户)

M1:

#su mysql

#ssh-keygen -t rsa

#cat ~/.ssh/id_rsa.pub

将公钥内容添加到N1,N2,N3,N4的对应用户(这里是mysql用户)下的./ssh/authorized_keys下即可实现M1到N1,N2,N3,N4的免密登录。

另外，这里踩了个坑，就是免密登录的server端(N1,N2,N3,N4)即/etc/ssh/sshd_config文件必须开启公钥登录

免密登录的client端(M1)即/etc/ssh/ssh_config文件不能关闭公钥登录(这个参数设置之后在公司环境下貌似还是不能免密登录，最后用了默认配置就可以了)

N1,N2,N3,N4节点之间也互相信任

2016-12-4 22:44:12 ADDssh客户端得注释以下参数 才能免密登录PreferredAuthentications password

③新建mysql mha管理账户，mysql repl复制用户

④新建mha工作目录

M1 ：mkdir -p /opt/mha_manager/log  chown -R mysql /opt/mha_manager

N1~N4：mkdir -p /opt/mha_node        chown -R mysql /opt/mha_node

⑤配置manager

M1:

#mkdir  -p /etc/mha

#cat /etc/mha/app1.conf

manager_workdir=/opt/mha_manager_work

manager_log=/opt/mha_manager_work/log/app1.log

remote_workdir=/opt/mha_node

对以上的配置文件更改属主为ssh信任账户(这里是mysql)

另外(源码安装的mysql注意)：

mha远程登录操作mysql的时候默认用不到/usr/local/mysql/bin下面的mysql 以及 mysqlbinlog会报相应的错误信息，

这个时候我们需要做如下操作

#ln -s /usr/local/mysql/bin/mysqlbinlog /usr/bin/mysqlbinlog

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

④开启manager

这里要注意的是，不要后台启动，即不要以 masterha_manager --conf=/etc/mha/app1.conf & 形式启动，不然会报错退出。我们前台启动，然后ctrl+z , bg放入后台。

至此，整个搭建过程完毕。

注意事项：

①slave最好设置 read_only=1 relay_log_purge=0,利用定时任务删除relay_log;

②mha进行failover之后会在app1.log中记录相应的chang master to master_xxx等信息，因此我们可以通过这条信息手动将

所宕master

连接到新主;

③可以使用(masterha_master_switch --master_state=alive --conf=/etc/mha/app1-f)进行手动切换主，然后将新主手动添加作为老主的从(步骤2)，注意mha manager必须处于关闭状态(masterha_check_status --conf=xxx);

④我们可以在app1.conf配置主库宕机后vip的飘逸脚本(

master_ip_failover_script=/usr/bin/masterha_ip_failover

)，但是第一次必须得自己手动在master添加vip.

附 masterha_ip_failover脚本

点击(此处)折叠或打开

#!/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;

my (

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

    $orig_master_port, $new_master_host, $new_master_ip, $new_master_port

);

my $vip = 192.168.1.111/24;

my $key = 0;

my $ssh_start_vip = "sudo /sbin/ifconfig eth2:$key $vip";

my $ssh_stop_vip = "sudo /sbin/ifconfig eth2:$key down";

#my $ssh_Bcast_arp = "/usr/bin/arping -c 3 -A 10.1.99.233"; #ARP回复模式，更新邻居。要是不加则服务器会自动等到vip缓存失效，期间VIP会有一定时间的不可用。

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();

# &start_arp();

            $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 -p56000 $ssh_user\@$new_master_host \" $ssh_start_vip \"`;

}

#sub start_arp() {

#    `ssh $ssh_user\@$new_master_host \" $ssh_Bcast_arp \"`;

#}

sub stop_vip() {

`ssh -p56000 $ssh_user\@$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";

}

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