centos安装keepalived

yum install keepalived

编辑keepalived.conf

vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id bj_ifc_ngix
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 50
    priority 90
    advert_int 1
}
authentication {
    auth_type PASS
    auth_pass 314159
}
virtual_ipaddress {
    192.168.1.253
}

state 2个都写成backup 让2台机器通过priority的优先级去抢主 ,优先级高的是主,最下面的IP我设定的是和eth0IP一个网段的,通过service keepalived start 启动服务,直接ping 253,如果通,那证明虚拟IP成功.