tcp 0 0 :::80 :::* LISTEN 19965/httpd
#运行状态检测脚本
[root@master ~]# nohup /root/haproxy_pid.sh &
[root@master ~]# scp -pr haproxy_pid.sh root@192.168.30.117:/root/
[root@bakcup ~]# nohup /root/haproxy_pid.sh &
[root@master ~]# tail -f /var/log/messages
Jan 10 12:02:29 localhost Keepalived_vrrp[19849]: VRRP sockpool: [ifindex(2), proto(112), fd(10,11)]
Jan 10 12:02:29 localhost Keepalived_vrrp[19849]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jan 10 12:02:30 localhost Keepalived_vrrp[19849]: VRRP_Instance(VI_1) Entering MASTER STATE
Jan 10 12:02:30 localhost Keepalived_vrrp[19849]: VRRP_Instance(VI_1) setting protocol VIPs.
Jan 10 12:02:30 localhost Keepalived_vrrp[19849]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.30.230
Jan 10 12:02:30 localhost Keepalived_healthcheckers[19848]: Netlink reflector reports IP 192.168.30.230 added
Jan 10 12:02:35 localhost Keepalived_vrrp[19849]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.30.230
Jan 10 12:14:49 localhost Keepalived[19847]: Stopping Keepalived v1.2.7 (02/21,2013)
Jan 10 12:14:49 localhost Keepalived_vrrp[19849]: VRRP_Instance(VI_1) sending 0 priority
Jan 10 12:14:49 localhost Keepalived_vrrp[19849]: VRRP_Instance(VI_1) removing protocol VIPs.
[root@master ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:f3:fc:ba brd ff:ff:ff:ff:ff:ff
inet 192.168.30.116/24 brd 192.168.30.255 scope global eth0
inet6 fe80::20c:29ff:fef3:fcba/64 scope link
valid_lft forever preferred_lft forever
[root@backup ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:5b:50:f9 brd ff:ff:ff:ff:ff:ff
inet 192.168.30.117/24 brd 192.168.30.255 scope global eth0
inet 192.168.30.230/32 scope global eth0
inet6 fe80::20c:29ff:fe5b:50f9/64 scope link
valid_lft forever preferred_lft forever
[root@backup ~]# ps aux | grep haproxy
haproxy 19054 0.0 0.0 18688 1280 ? Ss 12:47 0:00 /usr/sbin/haproxy -D -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid
root 19097 0.0 0.0 103248 828 pts/0 S+ 12:58 0:00 grep haproxy
发现IP已经转移到backup服务器，实现了keepalived对于haproxy故障的高可用。
keepalived常见的启动报错：
5913 May 16 15:26:04 localhost Keepalived_vrrp: ip address associated with VRID not present in received packet : 192.168.57.75
5914 May 16 15:26:04 localhost Keepalived_vrrp: one or more VIP associated with VRID mismatch actual MASTER advert
5915 May 16 15:26:04 localhost Keepalived_vrrp: bogus VRRP packet received on eth0 !!!
5916 May 16 15:26:04 localhost Keepalived_vrrp: VRRP_Instance(VI_1) ignoring received advertisment...
5917 May 16 15:26:05 localhost Keepalived_vrrp: ip address associated with VRID not present in received packet : 192.168.57.75
5918 May 16 15:26:05 localhost Keepalived_vrrp: one or more VIP associated with VRID mismatch actual MASTER advert
5919 May 16 15:26:05 localhost Keepalived_vrrp: bogus VRRP packet received on eth0 !!!
5920 May 16 15:26:05 localhost Keepalived_vrrp: VRRP_Instance(VI_1) ignoring received advertisment.
解决方法：
在同一网段内virtual_router_id 值不能相同，如果相同会在messages中收到VRRP错误包 ，所以需要更改 virual_router_id。