mysql主主复制keepalived切换

一、环境

主机名	IP		server id
mysql_master1	192.168.111.138	主主复制主机1	138
mysql_master2	192.168.111.139	主主复制主机2	139
mysql_test	192.168.111.140	测试机

二、master1授权

mysql>grant replication slave on *.* to 'zzfz'@'%' identified by 'zzfz';

mysql>show master status;

三、Master2授权

mysql>grant replication slave on *.* to 'zzfz'@'%' identified by 'zzfz';

mysql>show master status;

四、master1请求master2

mysql> change master to master_host='192.168.111.138',master_user='zzfz',master_password='zzfz',master_log_file='mysql-bin.000004',master_log_pos=246;

mysql> start slave;
mysql>show slave status\G;

注意要先关闭两台的防火墙

[root@localhost ~]# service iptables stop

五、master2请求master1

mysql> change master to master_host='192.168.111.139',master_user='zzfz',master_password='zzfz',master_log_file='mysql-bin.000004',master_log_pos=246;

mysql> start slave;
mysql>show slave status\G;

注意要先关闭两台的防火墙

[root@localhost ~]# service iptables stop

六、安装keepalived

1.到keepalived官网下载

http://www.keepalived.org/download.html

Keepalived for Linux - Version 1.2.23 - July 11, 2016

2.安装

[root@localhost ~]#tar zxvf keepalived-1.2.23.tar.gz

[root@localhost ~]cd keepalived-1.2.23

[root@localhost keepalived-1.2.23]./configure

[root@localhost keepalived-1.2.23]make

[root@localhost keepalived-1.2.23]make install

[root@localhost keepalived-1.2.23]cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

[root@localhost keepalived-1.2.23]cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

[root@localhost keepalived-1.2.23] mkdir /etc/keepalived

[root@localhost keepalived-1.2.23] cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/

[root@localhost keepalived-1.2.23] cp /usr/local/sbin/keepalived /usr/sbin/

3.编辑配置文件

master1的配置文件

[root@localhost ~]vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}

vrrp_instance VI_1 {
state BACKUP    //两台master上都改成</span>BACKUP
interface eth0
virtual_router_id 51
priority 100     //master1写100，master2写90，一般优先的写的数字要大一点
advert_int 1
nopreempt       // 手动添加这一行，不抢占模式
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.111.252    //两台上都要改成同一个网段的没有占用过的IP
}
}

master2的配置文件

[root@localhost ~]vi /etc/keepalived/keepalived.conf

<font color="windowtext"><font color="windowtext">! Configuration File for keepalived

global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}

vrrp_instance VI_1 {
state BACKUP    //两台master上都改成BACKUP
interface eth0
virtual_router_id 51
priority 90     //master1写100，master2写90，一般优先的写的数字要大一点
advert_int 1
nopreempt      // 手动添加这一行，不抢占模式
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.111.252    两台上都要改成同一个网段的没有占用过的IP
}
}

在master1和master2上运行keepalived服务

服务启动成功可以在先启动的一台上看到虚拟出来设定的IP地址192.168.111.252，而另一台上没有

如果在有虚拟IP的机器上停止keepalived服务，虚拟IP就会切换到另一台上,以实现mysql服务的高可用

七、测试

mysql_test机器连接虚拟的IP地址

[root@localhost ~]# mysql -h 192.168.111.252 -uzzfz -pzzfz

查看mysql的server id以验证服务被切换了

(zzfz@192.168.111.252) [(none)] show variables like '%server_id%';

server id 是138的机器是master1的

现在停止master1的keepalived服务

[root@localhost ~]# service keepalived stop

然后在mysql_test上查看虚拟IP是否被转移到master2上了

(zzfz@192.168.111.252) [(none)] show variables like '%server_id%';

可以看到server id 被转移到139上了

原文链接 http://www.waze7.com/?p=85