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mysql mha 缺点_MySQL高可用群集MHA部署及故障测试分析

作者：小丑西瓜9 | 2024-03-23 10:55:01

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mysql mha缺点

一、案例前置知识

1、MHA概述

·一套优秀的MySQL高可用环境下故障切换和主从复制的软件

·MySQL故障过程中，MHA能做到0-30秒内自动完成故障切换

2、MHA的组成

·MHA Manager(管理节点)

Manager可以单独部署在一台独立的机器上管理多个master-slave集群，也可以部署在一台slave节点上。

·MHA Node(数据节点)

Node运行在每台MySQL服务器上，MHA Manager会定时探测集群中的master节点，当master出现故障时，它可以自动将最新数据的slave提升为新的master，然后将所有其他的slave重新指向新的master。

3、MHA特点

·自动故障切换过程中，MHA试图从宕机的主服务器上保存二进制日志，最大程度的保证数据不丢失

·使用半同步复制，可以大大降低数据丢失的风险

·目前MHA支持一主多从架构，最少三台服务，即一主两从

4、MHA缺点

·需要编写脚本或利用第三方工具来实现vip的配置

·MHA启动后只会对数据库进行监控，需要基于ssh免认证配置，存在一定的安全隐患

·没有提供从服务器的读负载均很的功能。

二、案例拓扑图

三、案例部署

1、部署思路

(1)、MHA架构

①数据库安装

②一主两从

③MHA搭建

2、故障模拟

①主库失效

②备选主库成为主库

③从库2将备选主库指向为主库

3、故障修复

①坏库修复，启动

②在修复好的库上建立新主从关系

③修改manager配置文件，添加修好的库的记录

④重启mha

主服务器：mysql-server 20.0.0.10，从1服务器：mysql-slave1 20.0.0.20，从2服务器：mysql-slave2 20.0.0.30，mha:20.0.0.40

2、在三台 MySQL 节点上分别安装数据库

MySQL 版本请使用 5.6.36，cmake 版本请使用 2.8.6。安装过程如下。

主服务器

yum -y install ncurses-devel gcc-c++ perl-Module-Install

tar zxvf cmake-2.8.6.tar.gz

cd cmake-2.8.6

./configure

gmake && gmake install

tar zxvf mysql-5.6.36.tar.gz

cd mysql-5.6.36

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_EXTRA_CHARSETS=all -DSYSCONFDIR=/etc

make && make install

cp support-files/my-default.cnf /etc/my.cnf

cp support-files/mysql.server /etc/rc.d/init.d/mysqld

chmod +x /etc/rc.d/init.d/mysqld

chkconfig --add mysqld

echo "PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile

source /etc/profile

groupadd mysql

useradd -M -s /sbin/nologin mysql -g mysql

chown -R mysql.mysql /usr/local/mysql

mkdir -p /data/mysql

/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql

echo '

[client]

port = 3306

socket = /usr/local/mysql/mysql.sock

[mysql]

port = 3306

socket = /usr/local/mysql/mysql.sock

[mysqld]

user = mysql

basedir = /usr/local/mysql

datadir = /usr/local/mysql/data

port = 3306

pid-file = /usr/local/mysql/mysqld.pid

socket = /usr/local/mysql/mysql.sock

server-id = 1

log_bin = master-bin

log-slave-updates = true

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,PIPES_AS_CONCAT,ANSI_QUOTES' > /etc/my.cnf

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

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

systemctl start mysqld

netstat -anpt | grep 3306

从1服务器

yum -y install ncurses-devel gcc-c++ perl-Module-Install

tar zxvf cmake-2.8.6.tar.gz

cd cmake-2.8.6

./configure

gmake && gmake install

tar zxvf mysql-5.6.36.tar.gz

cd mysql-5.6.36

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_EXTRA_CHARSETS=all -DSYSCONFDIR=/etc

make && make install

cp support-files/my-default.cnf /etc/my.cnf

cp support-files/mysql.server /etc/rc.d/init.d/mysqld

chmod +x /etc/rc.d/init.d/mysqld

chkconfig --add mysqld

echo "PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile

source /etc/profile

groupadd mysql

useradd -M -s /sbin/nologin mysql -g mysql

chown -R mysql.mysql /usr/local/mysql

mkdir -p /data/mysql

/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql

echo '

[client]

port = 3306

socket = /usr/local/mysql/mysql.sock

[mysql]

port = 3306

socket = /usr/local/mysql/mysql.sock

[mysqld]

user = mysql

basedir = /usr/local/mysql

datadir = /usr/local/mysql/data

port = 3306

pid-file = /usr/local/mysql/mysqld.pid

socket = /usr/local/mysql/mysql.sock

server-id = 2

log_bin = master-bin

relay-log = relay-log-bin

relay-log-index = slave-relay-bin.index

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,PIPES_AS_CONCAT,ANSI_QUOTES' > /etc/my.cnf

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

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

systemctl start mysqld

netstat -anpt | grep 3306

从2服务器

yum -y install ncurses-devel gcc-c++ perl-Module-Install

tar zxvf cmake-2.8.6.tar.gz

cd cmake-2.8.6

./configure

gmake && gmake install

tar zxvf mysql-5.6.36.tar.gz

cd mysql-5.6.36

cmake -DCMAKE_INSTALL_PREFIX=/usr/local/mysql -DDEFAULT_CHARSET=utf8 -DDEFAULT_COLLATION=utf8_general_ci -DWITH_EXTRA_CHARSETS=all -DSYSCONFDIR=/etc

make && make install

cp support-files/my-default.cnf /etc/my.cnf

cp support-files/mysql.server /etc/rc.d/init.d/mysqld

chmod +x /etc/rc.d/init.d/mysqld

chkconfig --add mysqld

echo "PATH=$PATH:/usr/local/mysql/bin" >> /etc/profile

source /etc/profile

groupadd mysql

useradd -M -s /sbin/nologin mysql -g mysql

chown -R mysql.mysql /usr/local/mysql

mkdir -p /data/mysql

/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql

echo '

[client]

port = 3306

socket = /usr/local/mysql/mysql.sock

[mysql]

port = 3306

socket = /usr/local/mysql/mysql.sock

[mysqld]

user = mysql

basedir = /usr/local/mysql

datadir = /usr/local/mysql/data

port = 3306

pid-file = /usr/local/mysql/mysqld.pid

socket = /usr/local/mysql/mysql.sock

server-id = 3

relay-log = relay-log-bin

relay-log-index = slave-relay-bin.index

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_AUTO_VALUE_ON_ZERO,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,PIPES_AS_CONCAT,ANSI_QUOTES' > /etc/my.cnf

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

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

systemctl start mysqld

netstat -anpt | grep 3306

3、配置 MySQL一主两从

(1)、MySQL 主从配置相对比较简单，需要注意的是授权。步骤如下：在所有数据库节点上授权两个用户，一个是从库同步使用，另外一个是 manager 使用。

mysql> grant replication slave on *.* to 'myslave'@'20.0.0.%' identified by '123';

mysql> grant all privileges on *.* to 'mha'@'20.0.0.%' identified by 'manager';

mysql> flush privileges;

(2)、在主服务器上查看二进制文件和同步点

mysql> show master status;

+-------------------+----------+--------------+------------------+-------------------+

+-------------------+----------+--------------+------------------+-------------------+

| master-bin.000001 | 608 | | | |

+-------------------+----------+--------------+------------------+-------------------+

1 row in set (0.00 sec)

(3)、接下来在从1 和从2 分别执行同步,查看 IO 和 SQL 线程都是 yes 代表同步是否正常

mysql> change master to master_host='20.0.0.10',master_user='myslave',master_password='123',master_log_file='master-bin.000001',master_log_pos=608;

mysql> start slave;

mysql> show slave status\G;

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

1 I/O线程显示为NO: 主库与从库网络不通、主库未授权给从库

2 SQL线程显示为NO：从库日志和位置点与主不同步

3 若从库查看连接主库I/0线程状态为conneting，一直是这个状态，考虑双方的防火墙是否开启。

(4)、必须设置两个从库为只读模式

mysql> set global read_only=1;

(5)、在主库插入两条数据，测试是否同步

mysql> create database test_lixing;

mysql> use test_lixing;

mysql> create table test(id int);

mysql> insert into test(id) values (1);

mysql> select * from test;

(6)、在两个从库分别查询如下所示说明主从同步正常

从1

mysql> select * from test_lixing.test;

+------+

| id |

+------+

| 1 |

+------+

1 row in set (0.00 sec)

从2

mysql> select * from test_lixing.test;

+------+

| id |

+------+

| 1 |

+------+

1 row in set (0.00 sec)

4、安装MHA软件

(1)、在所有服务器上都安装 MHA 依赖的环境，每个服务器上都需要两个源(epel.repo和CentOS7-Base-163.repo),将这两个源放入/etc/yum.repos.d的目录下，在主服务器上操作演示安装

yum install epel-release --nogpgcheck

yum install -y perl-DBD-MySQL perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-ExtUtils-CBuilder perl-ExtUtils-MakeMaker perl-CPAN

(2)、在所有服务器上必须先安装 node 组件，最后在 MHA-manager 节点上安装 manager 组件，因为 manager 依赖 node 组件

tar zxvf mha4mysql-node-0.57.tar.gz

cd mha4mysql-node-0.57

perl Makefile.PL

make && make install

(3)、在mha-manager 服务器上安装 manager 组件

tar zxvf mha4mysql-manager-0.57.tar.gz

cd mha4mysql-manager-0.57

perl Makefile.PL

*** Module::AutoInstall version 1.06

*** Checking for Perl dependencies...

[Core Features]

- DBI ...loaded. (1.627)

- DBD::mysql ...loaded. (4.023)

- Time::HiRes ...loaded. (1.9725)

- Config::Tiny ...loaded. (2.14)

- Log::Dispatch ...loaded. (2.41)

- Parallel::ForkManager ...loaded. (1.18)

- MHA::NodeConst ...loaded. (0.57)

*** Module::AutoInstall configuration finished.

Checking if your kit is complete...

Looks good

Writing Makefile for mha4mysql::manager

make && make install

manager 安装后在/usr/local/bin 下面会生成几个工具，主要包括以下几个：

masterha_check_ssh 检查 MHA 的 SSH 配置状况

masterha_check_repl 检查 MySQL 复制状况

masterha_manger 启动 manager的脚本

masterha_check_status 检测当前 MHA 运行状态

masterha_master_monitor 检测 master 是否宕机

masterha_master_switch 控制故障转移(自动或者手动)

masterha_conf_host 添加或删除配置的 server 信息

masterha_stop 关闭manager

node 安装后也会在/usr/local/bin 下面会生成几个脚本(这些工具通常由 MHA-Manager 的脚本触发，无需人为操作)主要如下：

save_binary_logs 保存和复制 master 的二进制日志

apply_diff_relay_logs 识别差异的中继日志事件并将其差异的事件应用于其他的 slave

filter_mysqlbinlog 去除不必要的 ROLLBACK 事件(MHA 已不再使用这个工具)

purge_relay_logs 清除中继日志(不会阻塞 SQL 线程)

5、配置无密码认证

(1)、在 manager服务器上配置到所有节点的无密码认证

ssh-keygen -t rsa #一路按回车键

ssh-copy-id 20.0.0.10 #先输入yes，再输入20.0.0.10服务器的密码

ssh-copy-id 20.0.0.20

ssh-copy-id 20.0.0.30

验证

ssh root@20.0.0.10

ssh root@20.0.0.20

ssh root@20.0.0.30

(2)、在主服务器上配置到数据库节点的无密码认证

ssh-keygen -t rsa

ssh-copy-id 20.0.0.20

ssh-copy-id 20.0.0.30

验证

ssh root@20.0.0.20

ssh root@20.0.0.30

(3)、在从1服务器上配置到数据库节点的无密码认证

ssh-keygen -t rsa

ssh-copy-id 20.0.0.10

ssh-copy-id 20.0.0.30

验证

ssh root@20.0.0.10

ssh root@20.0.0.30

(4)、在从2服务器上配置到数据库节点的无密码认证

ssh-keygen -t rsa

ssh-copy-id 20.0.0.10

ssh-copy-id 20.0.0.20

验证

ssh root@20.0.0.10

ssh root@20.0.0.20

6、配置 MHA

(1)、在 manager 节点上复制相关脚本到/usr/local/bin 目录,复制上述的自动切换时 VIP 管理的脚本到/usr/local/bin 目录，这里使用脚本管理 VIP

cp -ra mha4mysql-manager-0.57/samples/scripts /usr/local/bin

ll /usr/local/bin/scripts/

cp /usr/local/bin/scripts/master_ip_failover /usr/local/bin

vi /usr/local/bin/master_ip_failover

删除文件里的所有内容，复制下面的内容

#!/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

);

#############################添加内容部分#########################################

my $vip = '20.0.0.200';

my $brdc = '20.0.0.255';

my $ifdev = 'ens33';

my $key = '1';

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

my $ssh_stop_vip = "/sbin/ifconfig ens33:$key down";

my $exit_code = 0;

#my $ssh_start_vip = "/usr/sbin/ip addr add $vip/24 brd $brdc dev $ifdev label $ifdev:$key;/usr/sbin/arping -q -A -c 1 -I $ifdev $vip;iptables -F;";

#my $ssh_stop_vip = "/usr/sbin/ip addr del $vip/24 dev $ifdev label $ifdev:$key";

##################################################################################

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";

exit 0;

}

else {

&usage();

exit 1;

}

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() {

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

}

sub usage {

"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";

}

拷贝后会有四个执行文件，文件的含义如下：

master_ip_failover #自动切换时 VIP 管理的脚本

master_ip_online_change #在线切换时 vip 的管理

power_manager #故障发生后关闭主机的脚本

send_report #因故障切换后发送报警的脚本

(2)、创建 MHA 软件目录并拷贝配置文件

1 mkdir /etc/masterha

2 cp mha4mysql-manager-0.57/samples/conf/app1.cnf /etc/masterha/

3 vim /etc/masterha/app1.cnf

4 [server default]

5 manager_workdir=/var/log/masterha/app1

6 manager_log=/var/log/masterha/app1/manager.log

7 master_binlog_dir=/usr/local/mysql/data

8 master_ip_failover_script= /usr/local/bin/master_ip_failover

9 master_ip_online_change_script= /usr/local/bin/master_ip_online_change10 password=manager

11 user=mha

12 ping_interval=1

13 remote_workdir=/tmp

14 repl_password=123

15 repl_user=myslave

16 secondary_check_script= /usr/local/bin/masterha_secondary_check -s 20.0.0.20 -s 20.0.0.30

17 shutdown_script=""

18 ssh_user=root

19 [server1]

20 hostname=20.0.0.10

21 port=3306

22 [server2]

23 hostname=20.0.0.20

24 port=3306

25 candidate_master=1

26 check_repl_delay=0

27 [server3]

28 hostname=20.0.0.30

29 port=3306

(3)、测试 ssh 无密码认证，如果正常最后会输出 successfully，如下所示

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

......

Wed Oct 28 00:07:09 2020 - [debug] Connecting via SSH from root@20.0.0.30(20.0.0.30:22) to root@20.0.0.20(20.0.0.20:22)..

Wed Oct 28 00:07:10 2020 - [debug] ok.

Wed Oct 28 00:07:10 2020 - [debug]

Wed Oct 28 00:07:08 2020 - [debug] Connecting via SSH from root@20.0.0.20(20.0.0.20:22) to root@20.0.0.10(20.0.0.10:22)..

Wed Oct 28 00:07:09 2020 - [debug] ok.

Wed Oct 28 00:07:09 2020 - [debug] Connecting via SSH from root@20.0.0.20(20.0.0.20:22) to root@20.0.0.30(20.0.0.30:22)..

Wed Oct 28 00:07:09 2020 - [debug] ok.

Wed Oct 28 00:07:10 2020 - [info] All SSH connection tests passed successfully.

(4)、测试 MySQL 主从连接情况，最后出现 MySQL Replication Health is OK 字样说明正常

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

......

IN SCRIPT TEST====/sbin/ifconfig ens33:1 down==/sbin/ifconfig ens33:1 20.0.0.200===

Checking the Status of the script.. OK

Wed Oct 28 09:25:28 2020 - [info] OK.

Wed Oct 28 09:25:28 2020 - [warning] shutdown_script is not defined.

Wed Oct 28 09:25:28 2020 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.

(5)、启动 MHA

nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 &

(6)、查看 MHA 状态，可以看到当前的 master 是主服务器节点

masterha_check_status --conf=/etc/masterha/app1.cnf

app1 (pid:24405) is running(0:PING_OK), master:20.0.0.10

(7)、查看 MHA 日志，也以看到当前的 master 是 20.0.0.10

cat /var/log/masterha/app1/manager.log

......

Wed Oct 28 09:27:04 2020 - [info] Replicating from 20.0.0.10(20.0.0.10:3306)

Wed Oct 28 09:27:04 2020 - [info] Current Alive Master: 20.0.0.10(20.0.0.10:3306)

Wed Oct 28 09:27:04 2020 - [info] Checking slave configurations..

Wed Oct 28 09:27:04 2020 - [warning] relay_log_purge=0 is not set on slave 20.0.0.20(20.0.0.20:3306).

Wed Oct 28 09:27:04 2020 - [warning] relay_log_purge=0 is not set on slave 20.0.0.30(20.0.0.30:3306).

Wed Oct 28 09:27:04 2020 - [warning] log-bin is not set on slave 20.0.0.30(20.0.0.30:3306). This host cannot be a master.

......

(8)、第一次配置vip的时候，需要在主服务器上创建虚拟IP地址

ifconfig ens33:1 20.0.0.200/24

ifconfig

四、故障测试

1、关闭主服务器的mysql服务

pkill mysqld

2、查看从1服务器的虚拟IP地址有没有转移过来，从2上查看主服务器是不是从1

从1服务器

ifconfig

ens33: flags=4163 mtu 1500

inet 20.0.0.20 netmask 255.255.255.0 broadcast 20.0.0.255

inet6 fe80::a140:18a2:d866:8f33 prefixlen 64 scopeid 0x20

ether 00:0c:29:42:10:0a txqueuelen 1000 (Ethernet)

RX packets 1315993 bytes 1324408060 (1.2 GiB)

RX errors 0 dropped 0 overruns 0 frame 0

TX packets 795190 bytes 69519345 (66.2 MiB)

TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

ens33:1: flags=4163 mtu 1500

inet 20.0.0.200 netmask 255.0.0.0 broadcast 20.255.255.255

ether 00:0c:29:42:10:0a txqueuelen 1000 (Ethernet)

从2服务器

mysql

mysql> show slave status \G

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

Slave_IO_State: Waiting for master to send event

Master_Host: 20.0.0.20

Master_User: myslave

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: master-bin.000003

Read_Master_Log_Pos: 120

Relay_Log_File: relay-log-bin.000002

Relay_Log_Pos: 284

Relay_Master_Log_File: master-bin.000003

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

......

3、重新开启manager服务器

(1)、主服务器开启mysql服务

systemctl restart mysqld

(2)、查看从1服务器查看二进制文件和同步点

mysql> show master status;

+-------------------+----------+--------------+------------------+-------------------+

+-------------------+----------+--------------+------------------+-------------------+

| master-bin.000003 | 120 | | | |

+-------------------+----------+--------------+------------------+-------------------+

1 row in set (0.00 sec)

(3)、在主服务器上执行同步,查看 IO 和 SQL 线程都是 yes 代表同步是否正常

mysql> change master to

master_host='20.0.0.20',master_user='myslave',master_password='123',master_log_file='master-bin.000003',master_log_pos=120;

mysql> start slave;

mysql> show slave status \G

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

Slave_IO_State: Waiting for master to send event

Master_Host: 20.0.0.20

Master_User: myslave

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: master-bin.000003

Read_Master_Log_Pos: 120

Relay_Log_File: mysqld-relay-bin.000002

Relay_Log_Pos: 284

Relay_Master_Log_File: master-bin.000003

Slave_IO_Running: Yes

Slave_SQL_Running: Yes18 ......

(4)、在从1上创建，主服务器和从2上查看

从1服务器

mysql> create database aa;

mysql> use aa;

mysql> create table test(id int(3));

mysql> insert into test values(1);

mysql> select * from test;

+------+

| id |

+------+

| 1 |

+------+

主服务器

mysql> use aa;

mysql> select * from test;

+------+

| id |

+------+

| 1 |

+------+

从2服务器

mysql> use aa;

mysql> select * from test;

+------+

| id |

+------+

| 1 |

+------+

(5)、在manager服务器上修改配置文件(再把这个记录添加进去，因为它检测掉失效时候会自动消失)

vi /etc/masterha/app1.cnf

......

[server1]

hostname=192.168.8.134

port=3306

......

(6)、在manager服务器上启动manager

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

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

nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 &

masterha_check_status --conf=/etc/masterha/app1.cnf

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