keepalived的简单应用——管理VIP的飘动

      安装很简单：

tar zxvf keepalived-1.1.20.tar.gz  
cd keepalived-1.1.20
./configure --prefix=/
make
make install 

      修改一下 /etc/keepalived/keepalived.conf 这个配置文件就可以用了，以下是我的环境，192.168.10.141和192.168.10.142是两个VIP，可以在两台服务器之间飘动：

      主机的配置：

global_defs {
   notification_email {
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 192.168.0.48
   smtp_connect_timeout 10
   router_id nginx
}

vrrp_instance VI_141 {
    state BACKUP
    interface eth0
    virtual_router_id 141
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 141
    }
    virtual_ipaddress {
        192.168.10.141/26 dev eth0
    }
}

vrrp_instance VI_142 {
    state BACKUP
    interface eth0
    virtual_router_id 142
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 142
    }
    virtual_ipaddress {
        192.168.10.142/26 dev eth0
    }
}

      备机的配置：

global_defs {
   notification_email {
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 10.168.0.48
   smtp_connect_timeout 10
   router_id nginx
}

vrrp_instance VI_141 {
    state BACKUP
    interface eth0
    virtual_router_id 141
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 141
    }
    virtual_ipaddress {
        192.168.10.141/26 dev eth0
    }
}

vrrp_instance VI_142 {
    state BACKUP
    interface eth0
    virtual_router_id 142
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 142
    }
    virtual_ipaddress {
        192.168.10.142/26 dev eth0
    }
}

      乍一看，主机和备机的配置文件是一样的，仔细看一下priority的值，使用以下命令即可将keepalived加入linux的服务中：

chkconfig --add keepalived ;

      通过启、停keepalived这个服务即可观察到VIP的飘动，至于为什么VIP飘动后可以很快地生效，还有待研究。