MySQL+keepalived高可用自动切换

Keepalived安装配置：

[root@localhost ~]# wget http://www.keepalived.org/software/keepalived-1.2.13.tar.gz

tar zxf keepalived-1.2.13.tar.gz

cd keepalived-1.2.13

yum install gcc gcc-c++

yum install kernel-devel  -y 

[root@localhost keepalived-1.2.13]# ./configure --with-kernel-dir=/usr/src/kernels/2.6.32-696.20.1.el6.x86_64/

&&make && make install 

[root@localhost keepalived-1.2.13]# DIR=/usr/local/

[root@localhost keepalived-1.2.13]#     cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

[root@localhost keepalived-1.2.13]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/ && mkdir -p /etc/keepalived

[root@localhost keepalived-1.2.13]# cp /usr/local/sbin/keepalived /usr/sbin/

修改Master服务器上keepalived.conf配置如下，vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
  notification_email {
  [email protected]
   }
  notification_email_from [email protected]
  smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
} 
#VIP1
vrrp_instance VI_1 {
   state MASTER
   interface eth0
   lvs_sync_daemon_inteface eth0
   virtual_router_id 151
   priority 100
   advert_int 5
   #nopreempt
   authentication {
       auth_type PASS
       auth_pass 2222
    }
   virtual_ipaddress {
        192.168.227.100
    }
}
virtual_server 192.168.227.100 3306 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    persistence_timeout 60
    protocol TCP
    real_server 192.168.227.138 3306 {
        weight 100
        notify_down /data/sh/msyql.sh 
        TCP_CHECK {
         connect_timeout 10
         nb_get_retry 3
         delay_before_retry 3
         connect_port 3306
         }
    }
}

[root@localhost keepalived]# /etc/init.d/keepalived restart
停止 keepalived：                                          [失败]
正在启动 keepalived：                                      [确定]
[root@localhost keepalived]# /etc/init.d/keepalived restart
停止 keepalived：                                          [确定]
正在启动 keepalived：                                      [确定]
[root@localhost keepalived]# ps -ef |grep keep
root      46101  30792  0 07:57 pts/0    00:00:00 vi keepalived.conf
root      46140      1  0 07:59 ?        00:00:00 keepalived -D
root      46142  46140  0 07:59 ?        00:00:00 keepalived -D
root      46143  46140  0 07:59 ?        00:00:00 keepalived -D

root      46148  30792  0 07:59 pts/0    00:00:00 grep keep

[root@localhost keepalived]# tail -fn100 /var/log/messages

[root@localhost keepalived]# cd 
[root@localhost ~]# modprobe ip_vs
[root@localhost ~]# lsmod |grep ip_vs
ip_vs                 125694  1 
libcrc32c               1246  1 ip_vs
ipv6                  334932  294 ip_vs,ip6t_REJECT,nf_conntrack_ipv6,nf_defrag_ipv6
[root@localhost ~]# /etc/init.d/keepalived restart 
停止 keepalived：                                          [确定]
正在启动 keepalived：                                      [确定]
[root@localhost ~]# tail -fn 10 /var/log/messages 

Mysql 从服务器配置keepalived.conf跟master 一样，只需要把Realserver IP修改成

real_server 192.168227.139;优先级从100改为90即可

在master、slave数据库上创建/data/sh/mysql.sh脚本，内容为：

pkill keepalived 

然后分别重启两台数据库上keepalive服务即可，最后测试停止master mysql 服务，是否会自动切换

到backup上