之前写了基本的安装，现在简单配置测试一下，主要看切换效果。

keepalived官方手册：http://www.keepalived.org/pdf/UserGuide.pdf

服务器信息：
master : 192.168.1.51
backup : 192.168.1.50
VIP       : 192.168.1.55

主服务器配置 /etc/keepalived/keepalived.conf ：

global_defs {
notification_email {
root@networkquestions.org     //定义报警邮件
}
notification_email_from warn@networkquestions.org            //定义发件人
smtp_server localhost               //指定smtp服务器，这里直接改为localhost
smtp_connect_timeout 30       //smtp连接超时时间
router_id node1                         //节点名称
}

vrrp_instance VI_1 {
state MASTER                //设置为主服务器
interface eth0                 //定义虚拟ip绑定接口
virtual_router_id 51     //VRRP组名，两个节点必须一样，指明各个节点属于同一VRRP组 mcast_src_ip 192.168.1.51    //发送多播包的地址，如果不设置默认使用绑定的网卡
priority 100                    //优先级，必须高于从服务器
advert_int 1                     //组播信息发送间隔，两个节点设置必须一样
authentication {               //认证，默认即可。主从需一致。
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.55                  //绑定的虚拟ip
}
}

我这里只保留了以上部分，其它参数全部删除。

从服务器配置 /etc/keepalived/keepalived.conf ：

global_defs {
notification_email {
acassen@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server localhost
smtp_connect_timeout 30
router_id node2
}

vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
mcast_src_ip 192.168.1.50      //从服务器ip
priority 99                                   //小于主服务器
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.55
}
}

保存退出，重启keepalived。

主服务器执行：
[root@rhel ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
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 qlen 1000
link/ether 00:0c:29:d4:de:01 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.51/24 brd 192.168.1.255 scope global eth0
inet 192.168.1.55/32 scope global eth0
inet6 fe80::20c:29ff:fed4:de01/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 00:0c:29:d4:de:0b brd ff:ff:ff:ff:ff:ff
4: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
看到192.168.1.55 已经绑定到eth0中。
tail -f /var/log/messages 会有相关信息输出。

现在拔掉主服务器网线，去从服务器查看：
[root@rhel ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue
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 qlen 1000
link/ether 00:0c:29:7f:5b:93 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.50/24 brd 192.168.1.255 scope global eth0
inet 192.168.1.55/32 scope global eth0
inet6 fe80::20c:29ff:fe7f:5b93/64 scope link
valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
link/ether 00:0c:29:7f:5b:9d brd ff:ff:ff:ff:ff:ff
4: sit0: <NOARP> mtu 1480 qdisc noop
link/sit 0.0.0.0 brd 0.0.0.0
接管了192.168.1.55 绑定到eth0

插上主服务器的网线，重启keepalived，再次执行ip  a 发现重新接管VIP。
测试完成。

PS:

keepalived 互为主备，当同一时间只有一台节点接管vip时，另一台处于备份状态，利用率不高，所以配置两个VIP，互为主备。

节点1：

global_defs {
   notification_email {
     xxx@qq.com
   }
   notification_email_from root@localhost
   smtp_server localhost
   smtp_connect_timeout 30
   router_id node1
}

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.200.16
    }
}

vrrp_instance VI_2 {
    state BACKUP
    interface eth0
    virtual_router_id 52
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.200.26
    }
}

节点2：

global_defs {
   notification_email {
     xxx@qq.com
   }
   notification_email_from root@localhost
   smtp_server localhost
   smtp_connect_timeout 30
   router_id node2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.200.16
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface eth0
    virtual_router_id 52
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.200.26
    }
}