//mmm手动切换IP，切换角色
//mmm切换IP
[root@home-db4 ~]# mmm_control set_passive
[root@home-db4 ~]# mmm_control set_ip 10.200.3.119 db1
//mmm切换角色
[root@home-db4 ~]# mmm_control set_active
[root@home-db4 ~]# mmm_control move_role writer db1
[root@home-db4 ~]# mmm_control show
