Keepalived高可用集群

 keepalived高可用集群是指一个主服务器，一个备份服务器，共同使用一个虚拟的ip地址，当主服务器宕掉之后，备份服务器开始工作，这样就避免了访问事故。

 搭建keepalived高可用集群
 [master]
 #yum -y install keepalived
 #vim /etc/keepalived/keepalived.conf
 vrrp_instance webha {
            state MASTER      主服务器
            interface eth0    网卡口
            priority 130      优先级
            authentication {
            auth_type PASS
            auth_pass 123456  主、备密码相同
                }
            virtual_ipaddress {
                    192.168.4.251  虚拟的网络地址
                    }
            }
    #service keepalived start
    #chkconfig keepalived on  开机自启
    #chkconfig --list | grep keepalived
    #ip add show | grep 192.168.4   查看虚拟ip在哪台服务器上

[slave]
#vim /etc/keepalived/keepalived.conf
vrrp_instance webha {
            state SLAVE/BACKUP      备份服务器
            interface eth0    网卡口
            priority 130      优先级
            authentication {
            auth_type PASS
            auth_pass 123456  主、备密码相同
                }
            virtual_ipaddress {
                    192.168.4.251  虚拟的网络地址
                    }
            }
    #service keepalived start
    #curl http://192.168.4.251