CentOS6.5环境 keepalived高可用服务单实例配置

一、环境说明MASTER节点 192.168.89.100BACKUP节点 192.168.89.101VIP：192.168.89.102二、MASTER节点的配置文件1、主节点配置文件! Configuration File for keepalivedglobal_defs { notification_email { [e-mail] [e-mail] [e-mail] } notification_email_from [e-mail] smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id 1b01}vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.89.102/24 dev eth0 label eth0:1 }}2、启动keepalived[root@kep1 keepalived]# /etc/init.d/keepalived start3、查看虚拟IP[root@kep1 keepalived]# ip addr | grep 192.168.89.102 inet 192.168.89.102/24 scope global secondary eth0三、BACKUP节点配置文件1、配置文件! Configuration File for keepalivedglobal_defs { notification_email { [e-mail] [e-mail] [e-mail] } notification_email_from [e-mail] smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id 1b02}vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 192.168.89.102/24 dev eth0 label eht0:1 }}2、启动keepalived[root@kep2 keepalived]# /etc/init.d/keepalived start3、检查虚拟IP[root@kep2 keepalived]# ip addr | grep 192.168.89.102注意：如果MASTER活着的神话，BACKUP不会接管虚拟IP，所以这里没有输出IP是正常的如果备节点有出现虚拟IP，那么说明高可用脑裂了，脑裂是两台服务器争抢统一资源导致的，如果发生脑裂，排除思路如下：1、主备是否通信正常？防火墙是否阻挡？2、主备两台的keepalived配置文件是否正确？virtual_router_id是否一样？四、进行高可用主备服务器切换测试1、停掉主节点上的keepalived服务，然后在BACKUP节点查看是否接管虚拟IP2、重新启动主节点上的keepalived服务，看看这时候主节点会不会重新接管VIP，BACKUP节点会不会释放VIP如果上面两个测试正常，说明配置没有问题。注意，如果发生脑裂问题，需要注意一下启动顺序