Keepalived架構高可用Mysql(二)

 4、配置keepalived   在線視頻演示

1)編輯配置文件

#guration File for keepalived
#global define
global_defs {
        router_id Hadb_1
        }
vrrp_sync_group VGM {
        group {
        VI_HA
        }
}
vrrp_script chk_mysql {
        script "killall -0 mysqld"
        interval 5
}
# vvrp_instance define #
vrrp_instance VI_HA {
        state MASTER
        interface eth0
        virtual_router_id 51
        priority 100
        advert_int 5
        authentication {
                auth_type PASS
                auth_pass hamysql
        }
        virtual_ipaddress {
                10.0.0.20
        }
        track_script {
                chk_mysql
        }
}

2）啓動Keepalived服務

分別啓動兩臺服務器的Keepalived服務並觀察其日誌，效驗高可用是否成功。

[10.0.0.18@localhost ~]# service keepalived start
[10.0.0.18@localhost ~]# tail /var/log/messages
Jun 15 03:06:35 localhost Keepalived_vrrp: VRRP_Script(chk_mysql) succeeded
Jun 15 03:06:36 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Transition to MASTER STATE
Jun 15 03:06:41 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Entering MASTER STATE
Jun 15 03:06:41 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) setting protocol VIPs.
Jun 15 03:06:41 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Sending gratuitous ARPs on eth0 for 10.0.0.20
Jun 15 03:06:41 localhost Keepalived_vrrp: VRRP_Group(VGM) Syncing instances to MASTER state
Jun 15 03:06:41 localhost Keepalived_vrrp: Netlink reflector reports IP 10.0.0.18 added
Jun 15 03:06:41 localhost Keepalived_healthcheckers: Netlink reflector reports IP 10.0.0.18 added
Jun 15 03:06:46 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Sending gratuitous ARPs on eth0 for 10.0.0.20

5、測試
1）找一臺裝有mysql客戶端的windows或linux機器登陸VIP測試。

[root@CentOS ~]# mysql -uroot -p123456 -h10.0.0.20
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 7
Server version: 5.0.77-log Source distribution

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

2）keepalived故障轉移測試

A：在windows或linux客戶端一直去ping  VIP，然後關閉10.0.0.18上的keepalived，正常情況下VIP就會切換到10.0.0.19上面去

B：開啓10.0.0.18上的keepalived，看是否能自動切換

3)MySQL故障轉移測試

A：在10.0.0.18上關閉MySQL服務，看VIP是否會切換到10.0.0.19上
 

[10.0.0.18@localhost ~]# service mysqld stop
[10.0.0.18@localhost ~]# tail /var/log/messages -f
Jun 15 03:20:35 localhost Keepalived_vrrp: VRRP_Script(chk_mysql) failed
Jun 15 03:20:36 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Entering FAULT STATE
Jun 15 03:20:36 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) removing protocol VIPs.
Jun 15 03:20:36 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Now in FAULT state
Jun 15 03:20:36 localhost Keepalived_vrrp: VRRP_Group(VGM) Syncing instances to FAULT state
Jun 15 03:20:36 localhost Keepalived_vrrp: Netlink reflector reports IP 10.0.0.18 removed
Jun 15 03:20:36 localhost Keepalived_healthcheckers: Netlink reflector reports IP 10.0.0.18 removed


[10.0.0.19@localhost ~]# tail /var/log/messages -f
Jun 15 03:20:47 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Transition to MASTER STATE
Jun 15 03:20:47 localhost Keepalived_vrrp: VRRP_Group(VGM) Syncing instances to MASTER state
Jun 15 03:20:52 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Entering MASTER STATE
Jun 15 03:20:52 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) setting protocol VIPs.
Jun 15 03:20:52 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Sending gratuitous ARPs on eth0 for 10.0.0.20
Jun 15 03:20:52 localhost Keepalived_vrrp: Netlink reflector reports IP 10.0.0.19 added
Jun 15 03:20:52 localhost Keepalived_healthcheckers: Netlink reflector reports IP 10.0.0.19 added
Jun 15 03:20:57 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Sending gratuitous ARPs on eth0 for 10.0.0.20

B：開啓10.0.0.18上的MySQL和keepalived

[10.0.0.18@localhost ~]# service mysqld start
[10.0.0.19@localhost ~]# tail /var/log/messages -f
Jun 15 03:23:52 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Received higher prio advert
Jun 15 03:23:52 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) Entering BACKUP STATE
Jun 15 03:23:52 localhost Keepalived_vrrp: VRRP_Instance(VI_HA) removing protocol VIPs.
Jun 15 03:23:52 localhost Keepalived_vrrp: VRRP_Group(VGM) Syncing instances to BACKUP state
Jun 15 03:23:52 localhost Keepalived_vrrp: Netlink reflector reports IP 10.0.0.19 removed
Jun 15 03:23:52 localhost Keepalived_healthcheckers: Netlink reflector reports IP 10.0.0.19 removed

C：下客戶端連接的MySQL的VIP，在切換時我執行了一個MySQL查詢命令
 

mysql> show tables;
No connection. Trying to reconnect...
Connection id:    10
Current database: test
+----------------+
| Tables_in_test |
+----------------+
| t2             |
+----------------+
1 row in set (0.00 sec)