环境说明：
实际使用方式：
两台设备上的应用服务A同时开启，只让有VIP的一端的服务器提供服务，若主的宕机，VIP会自动漂移到备的上面去，因此用户的请求就直接发送到备服务器上去了
两台设备：
10.1.13.4 MASTER
10.1.13.5 BACKUP
10.1.13.4 MASTER的配置
[root@bogon keepalived]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
845105563@qq.com
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id lb01
vrrp_skip_check_adv_addr
#vrrp_strict #这条一定要注释，不然VIP 无法被ping通
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_instance VI_1 {
state MASTER
interface bond0
virtual_router_id 51
priority 150
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.1.13.200
}
}
启动keepalived
ip addr
4: bond0: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP qlen 1000
link/ether 0c:c4:7a:28:2f:50 brd ff:ff:ff:ff:ff:ff
inet 10.1.13.4/24 brd 10.1.13.255 scope global bond0
valid_lft forever preferred_lft forever
inet 10.1.13.200/32 scope global bond0
valid_lft forever preferred_lft forever
inet6 fe80::ec4:7aff:fe28:2f50/64 scope link
valid_lft forever preferred_lft forever
你发现多了一行：inet 10.1.13.200/32 scope global bond0
10.1.13.5 BACKUP配置
[root@bogon keepalived]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
845105563@qq.com
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id lb02 #不同
vrrp_skip_check_adv_addr
#vrrp_strict #这条一定要注释，不然VIP 无法被ping通
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_instance VI_1 {
state BACKUP #不同
interface bond0 #不同
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.1.13.200
}
}
ip addr 发现backup没有这个10.1.13.200 IP地址
主备切换实验
停掉主服务器的keepalived服务，检查 10.1.13.200 VIP的位置
我们发现10.1.13.200 切换到 10.1.13.5 上面去了
此时我们再启动主服务器的keepalived服务,发现10.1.13.200 又回来了
这就是不抢占原则
