MySQL高可用性之Keepalived+Mysql(双主热备)
OS:CentOS6.5_X64
MASTER:192.168.0.202
BACKUP:192.168.0.203
VIP:192.168.0.204
1、配置两台Mysql主主同步
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[root@master ~] # yum install mysql-server mysql -y [root@master ~] # service mysqld start [root@master ~] # mysqladmin -u root password 123.com [root@master ~] # vi /etc/my.cnf #开启二进制日志,设置id [mysqld] server- id = 1 #backup这台设置2 log-bin = mysql-bin binlog-ignore-db = mysql,information_schema #忽略写入binlog日志的库 auto-increment-increment = 2 #字段变化增量值 auto-increment-offset = 1 #初始字段ID为1 slave-skip-errors = all #忽略所有复制产生的错误 [root@master ~] # service mysqld restart |
#先查看下log bin日志和pos值位置
master配置如下:
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[root@ master ~] # mysql -u root -p123.com mysql> GRANT REPLICATION SLAVE ON *.* TO 'replication' @ '192.168.0.%' IDENTIFIED BY 'replication' ; mysql> flush privileges; mysql> change master to -> master_host= '192.168.0.203' , -> master_user= 'replication' , -> master_password= 'replication' , -> master_log_file= 'mysql-bin.000002' , -> master_log_pos=106; #对端状态显示的值 mysql> start slave; #启动同步 |
backup配置如下:
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[root@backup ~] # mysql -u root -p123.com mysql> GRANT REPLICATION SLAVE ON *.* TO 'replication' @ '192.168.0.%' IDENTIFIED BY 'replication' ; mysql> flush privileges; mysql> change master to -> master_host= '192.168.0.202' , -> master_user= 'replication' , -> master_password= 'replication' , -> master_log_file= 'mysql-bin.000002' , -> master_log_pos=106; mysql> start slave; |
#主主同步配置完毕,查看同步状态Slave_IO和Slave_SQL是YES说明主主同步成功。
在master插入数据测试下:
在backup查看是否同步成功:
可以看到已经成功同步过去,同样在backup插入到user表数据,一样同步过去,双主就做成功了。
2、配置keepalived实现热备
[root@backup ~]# yum install -y pcre-devel openssl-devel popt-devel #安装依赖包
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[root@master ~] # wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz [root@master ~] # tar zxvf keepalived-1.2.7.tar.gz [root@master ~] # cd keepalived-1.2.7 [root@master ~] #./configure --prefix=/usr/local/keepalived make && make install |
#将keepalived配置成系统服务
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[root@master ~] # cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/ [root@master ~] # cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/ [root@master ~] # mkdir /etc/keepalived/ [root@master ~] # cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/ [root@master ~] # cp /usr/local/keepalived/sbin/keepalived /usr/sbin/ |
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[root@master ~] # vi /etc/keepalived/keepalived.conf ! Configuration File forkeepalived global_defs { notification_email { test @sina.com } notification_email_from admin@ test .com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id MYSQL_HA #标识,双主相同 } vrrp_instance VI_1 { state BACKUP #两台都设置BACKUP interface eth0 virtual_router_id 51 #主备相同 priority 100 #优先级,backup设置90 advert_int 1 nopreempt #不主动抢占资源,只在master这台优先级高的设置,backup不设置 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.0.204 } } virtual_server 192.168.0.204 3306 { delay_loop 2 #lb_algo rr #LVS算法,用不到,我们就关闭了 #lb_kind DR #LVS模式,如果不关闭,备用服务器不能通过VIP连接主MySQL persistence_timeout 50 #同一IP的连接60秒内被分配到同一台真实服务器 protocol TCP real_server 192.168.0.202 3306 { #检测本地mysql,backup也要写检测本地mysql weight 3 notify_down /usr/local/keepalived/mysql .sh #当mysq服down时,执行此脚本,杀死keepalived实现切换 TCP_CHECK { connect_timeout 3 #连接超时 nb_get_retry 3 #重试次数 delay_before_retry 3 #重试间隔时间 } } |
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[root@master ~] # vi /usr/local/keepalived/mysql.sh #!/bin/bash pkill keepalived [root@master ~] # chmod +x /usr/local/keepalived/mysql.sh [root@master ~] # /etc/init.d/keepalived start |
#backup服务器只修改priority为90、nopreempt不设置、real_server设置本地IP。
#授权两台Mysql服务器允许root远程登录,用于在其他服务器登陆测试!
mysql> grant all on *.* to'root'@'192.168.0.%' identified by '123.com';
mysql> flush privileges;
3、测试高可用性
1、通过Mysql客户端通过VIP连接,看是否连接成功。
2、停止master这台mysql服务,是否能正常切换过去,可通过ip addr命令来查看VIP在哪台服务器上。
3、可通过查看/var/log/messges日志,看出主备切换过程
4、master服务器故障恢复后,是否主动抢占资源,成为活动服务器。
原创连接:http://lizhenliang.blog.51cto.com/7876557/1362313