使用mysql-mmm实现mysql集群部署_MySQL
背景:之前实现的mysql同步复制功能(见笔者之前文章http://blog.csdn.net/kingofworld/article/details/39210937)只是双机热备功能,还不能做到Mysql链接的自动切换。
本配置实现真正的mysql集群,使得在某台机子的mysql应用停止时,能让应用程序自动切换到另外一台机子的mysql连接,实现应用的高稳定性,并且使得扩展Mysql服务成为可能。
本配置使用mysql-mmm(master-master Replication Manager for MySQL)组件实现集群功能。
本次演示的配置使用三台机器,架构如下:
Master1 和Master2两台机器实现双机热备,其中一台机器的mysql服务停止或机器宕机,应用程序都会将数据库连接自动切换到另外一台机子。另外用一台机子实时备份master1的数据。
1、安装mysql-mmm服务
在三台机器都安装
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm
yum -y install mysql-mmm*
完成后查看 rpm -qa|grep mysql-mmm
有以下组件表示安装成功

Rhel5或centos5,32位:http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
Rhel6或centos6,32位:http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-5.noarch.rpm
Rhel6或centos6,64位:http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
1、添加mysql的用户
在三台机器都添加mysql用户,分别用于复制、
进入mysql服务mysql -u root -p
use mysql;
grant REPLICATION slave,REPLICATION CLIENT on *.* to 'repl'@'%' identified by 'password'; //建立复制用户
grant PROCESS,SUPER,REPLICATION CLIENT on *.* to 'mmm_agent'@'%' identified by 'password'; //建立agent用户
grant REPLICATION CLIENT on *.* to 'mmm_monitor'@'%' identified by 'password'; //建立用户
FLUSH PRIVILEGES;
2、配置同步复制
配置复制的策略如架构图所示。
配置方法在我上一篇文章有介绍过,这里不再重复,见笔者之前文章http://blog.csdn.net/kingofworld/article/details/39210937
3、修改hosts
分别修改三台机器的hosts文件
vi /etc/hosts
添加
200.200.168.24 M1
200.200.168.25 M2
200.200.168.23 slave1
4、配置mysql-mmm
修改 /etc/mysql-mmm/mmm_common.conf 各台机子的配置都一样
active_master_role writer <host default> cluster_interface eth0 pid_path /var/run/mysql-mmm/mmm_agentd.pid bin_path /usr/libexec/mysql-mmm/ replication_user repl replication_password password agent_user mmm_agent agent_password <span style="font-size: 13.3333339691162px;">password</span> </host> <host M1> ip 200.200.168.24 mode master peer M2 </host> <host M2> ip 200.200.168.25 mode master peer M1 </host> <host slave1> ip 200.200.168.23 mode slave </host> <role writer> hosts M1,M2 ips 200.200.168.26 mode exclusive </role> <role reader> hosts M1,M2,slave1 ips 200.200.168.27 mode balanced </role>
注意:200.200.168.26和200.200.168.27是两个虚拟的IP地址,供应用程序调用,只需用两个没人占用的IP就可以,分别用来提供写和读服务,为以后实现数据库的读写分离(但实现读写分离需要修改应用程序,mysql并不能自动识别并切换)。
修改/etc/mysql-mmm/mmm_agent.conf
三台机器分别设置为this M1、this M2、this slave1
修改/etc/mysql-mmm/mmm_mon.conf
只是monitor(200.200.168.24)机子需要配置
include mmm_common.conf <monitor> ip 127.0.0.1 pid_path /var/run/mysql-mmm/mmm_mond.pid bin_path /usr/libexec/mysql-mmm status_path /var/lib/mysql-mmm/mmm_mond.status ping_ips 200.200.168.24,200.200.168.25,200.200.168.23 auto_set_online 10 # The kill_host_bin does not exist by default, though the monitor will # throw a warning about it missing. See the section 5.10 "Kill Host # Functionality" in the PDF documentation. # # kill_host_bin /usr/libexec/mysql-mmm/monitor/kill_host # </monitor> <host default> monitor_user mmm_monitor monitor_password password </host> debug 0
配置完成后运行
三台机子都需运行:
/etc/init.d/mysql-mmm-agent start
Monitor机子运行
/etc/init.d/mysql-mmm-monitor start
5、查看服务状态及测试
在monitor机子运行mmm_control show
可以看到以下信息:

表示写服务器(200.200.168.26)使用的是200.200.168.24
读服务器(200.200.168.27)使用的是200.200.168.25
查看各个服务的状态:
mmm_control checks all

6、测试:
将master1的mysql服务停止,然后mmm_control show查看状态

可以看到读写服务器都转移到了master2,这时服务器master1的流程应用还能够正常使用,可以进行申请流程测试
这时查看mmm_control checks all

将master1 的mysql服务启动,再查看状态:

读写服务器又分开了


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