MySQL(MMM架构使用)

本案例要求基于普通版的MySQL服务器改造MMM架构，完成以下任务操作：
启动MMM集群架构
设置集群中服务器为online状态
MySQL-MMM架构部署完成后需要启动，数据库端启动mmm-agent进程，管理端启动mmm-monitor进程，启动完成后设置所有数据库主机状态为online。
实现此案例需要按照如下步骤进行。

步骤一：启动MMM集群架构

1）启动mmm-agent进程

master1操作：
[root@master1 ~]# /etc/init.d/mysql-mmm-agent start
Daemon bin: '/usr/sbin/mmm_agentd'
Daemon pid: '/var/run/mmm_agentd.pid'
Starting MMM Agent daemon... Ok
master2操作：
[root@master2 ~]# /etc/init.d/mysql-mmm-agent start
Daemon bin: '/usr/sbin/mmm_agentd'
Daemon pid: '/var/run/mmm_agentd.pid'
Starting MMM Agent daemon... Ok
slave1操作：
[root@master2 ~]# /etc/init.d/mysql-mmm-agent start
Daemon bin: '/usr/sbin/mmm_agentd'
Daemon pid: '/var/run/mmm_agentd.pid'
Starting MMM Agent daemon... Ok
slave2操作：
[root@slave2 ~]# /etc/init.d/mysql-mmm-agent start
Daemon bin: '/usr/sbin/mmm_agentd'
Daemon pid: '/var/run/mmm_agentd.pid'
Starting MMM Agent daemon... Ok
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2）启动mmm-monitor进程

monitor主机操作：
[root@monitor ~]# /etc/init.d/mysql-mmm-monitor start
Daemon bin: '/usr/sbin/mmm_mond'
Daemon pid: '/var/run/mmm_mond.pid'
Starting MMM Monitor daemon: Ok
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步骤二：设置集群中服务器为online状态

控制命令只能在管理端monitor服务器上执行。
查看当前集群中各服务器状态：
[root@monitor ~]# mmm_control show
master1(192.168.4.10) master/AWAITING_RECOVERY. Roles:
master2(192.168.4.11) master/AWAITING_RECOVERY. Roles:
slave1(192.168.4.12) slave/AWAITING_RECOVERY. Roles:
slave2(192.168.4.13) slave/AWAITING_RECOVERY. Roles:
设置4台数据库主机状态为online：
[root@monitor ~]# mmm_control set_online master1
OK: State of 'master1' changed to ONLINE. Now you can wait some time and check its new roles!
[root@monitor ~]# mmm_control set_online master2
OK: State of 'master2' changed to ONLINE. Now you can wait some time and check its new roles!
[root@monitor ~]# mmm_control set_online slave1
OK: State of 'slave1' changed to ONLINE. Now you can wait some time and check its new roles!
[root@monitor ~]# mmm_control set_online slave2
OK: State of 'slave2' changed to ONLINE. Now you can wait some time and check its new roles!
[root@monitor ~]#
再次查看当前集群中各服务器状态：
[root@monitor ~]# mmm_control show
master1(192.168.4.10) master/ONLINE. Roles: writer(192.168.4.200)
master2(192.168.4.11) master/ONLINE. Roles:
slave1(192.168.4.12) slave/ONLINE. Roles: reader(192.168.4.201)
slave2(192.168.4.13) slave/ONLINE. Roles: reader(192.168.4.202)

[root@monitor ~]#
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步骤三：测试MySQL-MMM架构

1）客户机安装MySQL-client软件包

[root@client ~]# tar xvf MySQL-5.6.15-1.el6.x86_64.rpm-bundle.tar
.. ..
[root@client ~]# rpm -ivh MySQL-client-5.6.15-1.el6.x86_64.rpm
.. ..
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2）MySQL-MMM虚拟IP访问测试

[root@client ~]# mysql -h192.168.4.202 -uroot -ppwd123 -e "show databases"
Warning: Using a password on the command line interface can be insecure.
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| tarena |
| test |
+--------------------+
[root@client ~]#
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3）主数据库宕机测试
[

root@master1 ~]# service mysql stop //停止master1上服务
Shutting down MySQL.... [确定]
[root@master1 ~]#

[root@monitor ~]# mmm_control show //查看集群内服务器状态
通过输出信息可以看到虚拟IP从master1切换到master2：
master1(192.168.4.10) master/HARD_OFFLINE. Roles:
master2(192.168.4.11) master/ONLINE. Roles: writer(192.168.4.200)
slave1(192.168.4.12) slave/ONLINE. Roles: reader(192.168.4.201)
slave2(192.168.4.13) slave/ONLINE. Roles: reader(192.168.4.202)
[root@monitor ~]#