环境描述：OS：CentOS6.5_X64MASTER：192.168.0.202BACKUP：192.168.0.203VIP：192.168.0.2041、配置两台Mysql主主同步[root@master~]#yuminstallmysql-servermy
环境描述：
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
[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]log-bin=mysql-binserver-id=1#backup这台设置2[root@master ~]# service mysqld restart
#先查看下log bin日志和pos值位置
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master配置如下：
[root@ master ~]# mysql -u root -p123.commysql> 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：
[root@backup ~]# mysql -u root -p123.commysql> 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;
2、配置keepalived实现热备
[root@backup ~]# yum install -y pcre-devel openssl-devel popt-devel #安装依赖包
[root@master ~]# wget [root@master ~]# tar zxvf keepalived-1.2.7.tar.gz[root@master ~]# cd keepalived-1.2.7[root@master ~]#./configure –prefix=/usr/local/keepalivedmake && make install
#将keepalived配置成系统服务
[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/[root@master ~]# vi /etc/keepalived/keepalived.conf! Configuration File forkeepalivedglobal_defs {notification_email {test@sina.com }notification_email_fromadmin@test.comsmtp_server 127.0.0.1smtp_connect_timeout 30router_id MYSQL_MASTER #backup服务器设置MYSQL_BACKUP }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 lb_kind DR#LVS模式 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mysq 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 }}[root@master ~]# vi /usr/local/keepalived/mysql.sh#!/bin/bashpkill keepalived[root@master ~]# chmod +x /usr/local/keepalived/mysql.sh[root@master ~]# /etc/init.d/keepalived start
#授权两台Mysql服务器允许root远程登录：
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。
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