MHA的安装和部署步骤

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##################MHA安装和部署####################

1.服务器

 192.168.0.21 mydb1   #Master

 192.168.0.22 mydb2   #Slave

 192.168.0.23 mydb3   #MHA manager

2. 所有机器修改vim /etc/hosts

192.168.0.21   mydb1

192.168.0.22   mydb2

192.168.0.23   mydb3

3.设置ssh公钥免密码登录

#root用户操作(/root),pwd

   mkdir ~/.ssh

   chmod 700 ~/.ssh

   cd ~/.ssh

   ssh-keygen -t rsa #一直回车

   ls -al

   cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

   ls -al

   chmod 600 ~/.ssh/authorized_keys

   cd ..

   scp -r .ssh 192.168.0.22:/root/

   scp -r .ssh 192.168.0.23:/root/

  ssh mydb1

  ssh mydb2

  ssh mydb3

4.下载mha4Mysql-manager和mha4mysql-node

   https://GitHub.com/yoshinorim/mha4mysql-manager

   Https://github.com/yoshinorim/mha4mysql-node

 5.在三个节点（node 和 manager）安装perl-DBD-MySQL，用光盘作yum源，#包括了3个包：Perl-DBD-MySQL,mysql-libs,perl-DBI

   yum install perl-DBD-MySQL

   yum install perl-DBI 

   yum install mysql-libs

 6.在三个节点安装node（包括管理节点）

  tar xzvf mha4mysql-node-0.56.tar.gz

  cd mha4mysql-node-0.56

  perl Makefile.PL

  make && make install

 7.在管理节点安装manager

   rpm -ivh perl-Config-Tiny-2.12-1.el5.rf.noarch.rpm  

   rpm -ivh perl-Params-Validate-0.95-1.el5.rf.i386.rpm 

   rpm -ivh perl-MIME-Types-1.28-2.el6.noarch.rpm

   rpm -ivh perl-Email-Date-FORMat-1.002-5.el6.noarch.rpm

   rpm -ivh perl-Mail-Sender-0.8.16-3.el6.noarch.rpm

   rpm -ivh perl-Mail-Sendmail-0.79-12.el6.noarch.rpm

   rpm -ivh perl-TimeDate-1.16-11.1.el6.noarch.rpm

   rpm -ivh perl-MailTools-2.04-4.el6.noarch.rpm

   rpm -ivh perl-MIME-Lite-3.027-2.el6.noarch.rpm

   rpm -ivh perl-Log-Dispatch-2.26-1.el5.rf.noarch.rpm 

   rpm -ivh perl-Parallel-ForkManager-0.7.5-2.2.el5.rf.noarch.rpm

   yum install perl-Time-HiRes       #光盘yum源

   tar xzvf mha4mysql-manager-0.56.tar.gz

   cd mha4mysql-manager-0.56

   perl Makefile.PL

   make && make install

####################常用命令###############

/usr/local/bin/masterha_check_ssh --conf=/u01/mha/etc/app.cnf

/usr/local/bin/masterha_check_repl --conf=/u01/mha/etc/app.cnf

/usr/local/bin/masterha_manager --conf=/u01/mha/etc/app.cnf &

/u01/mha/etc/masterha_check_status --conf=/u01/mha/etc/app.cnf

/usr/local/bin/masterha_stop --conf=/u01/mha/etc/app.cnf

###################切换######################

一、failover故障切换

 1.模拟主库宕机

   [root@mydb3~]# ssh mydb1 "killall -r mysqld"

 2.查看管理节点日志，可以看到VIP已经漂移

  [root@mydb3 ~]# cat /u01/mha/log/manager.log |grep -i vip

 3. 验证VIP是否位于节点mydb2

  [root@mydb3 ~]# ssh mydb2 "ifconfig |grep 0.201 -B1"

 4. 查看管理节点MHA切换日志

 [root@mydb3 ~]# tail /u01/mha/log/manager.log

 5. new master(old slave)

 show master status\G

 6. new slave(old:master)

     (1)打开MySQL

        mysqld_safe --defaults-file=/u01/my3306/my.cnf &

     (2)检查数据库

        show master status\G

        show slave  status\G

     (3)在管理节点日志中查主库的日志文件和位置

        cat /u01/mha/etc/app/manager.log |grep -i change

     (4)在slave连接master

        CHANGE MASTER TO

        MASTER_HOST='192.168.0.21',

        MASTER_PORT=3306,

        MASTER_LOG_FILE='mysql-bin.000005',

        MASTER_LOG_POS=120,

        MASTER_USER='repl',

        MASTER_PASSWord='123456';

7.启动管理节点

 /usr/local/bin/masterha_manager --conf=/u01/mha/etc/app.cnf &

 /usr/local/bin/masterha_manager --conf=/u01/mha/etc/app.cnf  --ignore_last_failover &

二、switchover线上切换

1.master：关闭event_scheduler（即192.168.0.21） 

set global event_scheduler=off;

2.manager：关闭管理进程 （即192.168.0.23）

/usr/local/bin/masterha_stop --conf=/u01/mha/etc/app.cnf

3.manager：检查配置文件

/u01/mha/etc/app.cnf  有没有被修改破坏。如果破坏需要重新编辑正确配置文件：/u01/mha/etc/app.cnf

cp /u01/mha/etc/app.cnf.bak /u01/mha/etc/app.cnf

4.开始切换：

/u01/mha/etc/masterha_master_switch --master_state=alive --conf=/u01/mha/etc/app.cnf

5.new master(old slave)

 mysql> show master status\G

*************************** 1. row ***************************

             File: binlog.000021

         Position: 299

     Binlog_Do_DB: 

 Binlog_Ignore_DB: 

Executed_Gtid_Set: 

1 row in set (0.00 sec)

6.new slave(old master)

CHANGE MASTER TO

        MASTER_HOST='192.168.0.22',

        MASTER_PORT=3306,

        MASTER_LOG_FILE='binlog.000021',

        MASTER_LOG_POS=299,

        MASTER_USER='repl',

        MASTER_PASSWORD='123456';

mysql> start slave;

Query OK, 0 rows affected (0.01 sec)

mysql> show slave status\G

*************************** 1. row ***************************

               Slave_IO_State: Waiting for master to send event

                  Master_Host: 192.168.56.12

                  Master_User: repl

                  Master_Port: 3306

                Connect_Retry: 60

              Master_Log_File: binlog.000017

          Read_Master_Log_Pos: 299

               Relay_Log_File: relaylog.000002

                Relay_Log_Pos: 280

        Relay_Master_Log_File: binlog.000017

             Slave_IO_Running: Yes

            Slave_SQL_Running: Yes

7.启动管理节点

   /u01/mha/etc/masterha_manager --conf=/u01/mha/etc/app.cnf &

  /u01/mha/etc/masterha_manager --conf=/u01/mha/etc/app.cnf --remove_dead_master_conf --ignore_last_failover

#################配置文件###################

vim /u01/mha/etc/app.cnf

[server default]

user = root

password = root123

ssh_user = root

repl_user = rep

repl_password = 123456

ping_interval = 1

ping_type = SELECT

manager_workdir=/u01/mha/etc/app

manager_log=/u01/mha/log/manager.log

remote_workdir=/u01/mha/etc/app

master_binlog_dir="/u01/my3306/log/binlog"

master_ip_failover_script="/u01/mha/etc/master_ip_failover"

master_ip_online_change_script="/u01/mha/etc/master_ip_failover"

shutdown_script=""

report_script=""

#check_repl_delay=0

[server1]

hostname=mydb1

port=3306

master_binlog_dir="/apps/dbdat/mysql5_data3306/log"

candidate_master=1

ignore_fail=1

[server2]

hostname=mydb2

port=3306

master_binlog_dir="/u01/my3306/log/binlog"

candidate_master=1

ignore_fail=1

---------------------------------------------------------------------------------

vim /u01/mha/etc/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 = '192.168.0.201/24';  # Virtual IP

my $key = "1";

my $int = "eth0";

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

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

my $arp_effect = "/sbin/arping -Uq -s192.168.0.201 -I $int 192.168.0.1 -c 3";    # Virtual IP and gat

eway

#my $test = "echo successfull >/tmp/test.txt";

$ssh_user = "root";

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";

        #`ssh $ssh_user\@cluster1 \" $ssh_start_vip \"`;

        &status();

        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 \"`;

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

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

}

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

sub stop_vip() {

    `ssh $ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;

}

sub status() {

    print `ssh $ssh_user\@$orig_master_host \" ip add show $int \"`;

}

sub usage {

    print

    "Usage: master_ip_failover --command=start|stop|stopssh|status --orig_master_host=host --orig_maste

r_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";

}

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