Keepalived基本问题定位方法
1，检查配置文件2，查看lvs生效配置
#ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.230.100:80 rr
-> 192.168.230.12:80 Route 1 0 0
-> 192.168.230.13:80 Route 1 0 0
3，查看keepalived状态：
# servicekeepalived status
Redirecting to /bin/systemctl statuskeepalived.service
keepalived.service - LVS and VRRP HighAvailability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled)
Active: inactive (dead) since Thu 2016-08-25 11:21:06CST; 6s ago
# Active: inactive(dead)非活动状态
4，查看记录的日志
Redirecting to /bin/systemctl statuskeepalived.service
Aug 25 11:46:23 localhost.localdomainKeepalived_vrrp: VRRP_Instance(VI_1) Received higher prio advert
Aug 25 11:46:23 localhost.localdomainKeepalived_vrrp: VRRP_Instance(VI_1) EnteringBACKUP STATE#切换为备状态
Aug 25 11:46:23 localhost.localdomainKeepalived_vrrp: VRRP_Instance(VI_1) removing protocol VIPs.
Aug 25 11:46:23 localhost.localdomainKeepalived_healthcheckers: Netlink reflector reports IP 192.168.230.100removed
5，查看vrrp报文，特别注意vid是否一致。
6，查看接口状态
7，查看IPVS连接状态信息
# ipvsadm -lcn
IPVS connection entries
pro expire state source virtual destination
TCP 01:56 FIN_WAIT 192.168.230.15:46655192.168.230.100:80 192.168.230.12:80
TCP 01:57 FIN_WAIT 192.168.230.15:46656192.168.230.100:80 192.168.230.13:80
8，查看接口属性
# sysctl -a |grepnet.ipv4.ip_forward
# sysctl -a |greparp_ignore
# sysctl -a |greparp_announce
9，查看系统日志
# tail /var/log/messages
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