Keepalived高可用集群

 keepalived高可用集群是指一個主服務器，一個備份服務器，共同使用一個虛擬的ip地址，當主服務器宕掉之后，備份服務器開始工作，這樣就避免了訪問事故。

 搭建keepalived高可用集群
 [master]
 #yum -y install keepalived
 #vim /etc/keepalived/keepalived.conf
 vrrp_instance webha {
            state MASTER      主服務器
            interface eth0    網(wǎng)卡口
            priority 130      優(yōu)先級
            authentication {
            auth_type PASS
            auth_pass 123456  主、備密碼相同
                }
            virtual_ipaddress {
                    192.168.4.251  虛擬的網(wǎng)絡地址
                    }
            }
    #service keepalived start
    #chkconfig keepalived on  開機自啟
    #chkconfig --list | grep keepalived
    #ip add show | grep 192.168.4   查看虛擬ip在哪臺服務器上

[slave]
#vim /etc/keepalived/keepalived.conf
vrrp_instance webha {
            state SLAVE/BACKUP      備份服務器
            interface eth0    網(wǎng)卡口
            priority 130      優(yōu)先級
            authentication {
            auth_type PASS
            auth_pass 123456  主、備密碼相同
                }
            virtual_ipaddress {
                    192.168.4.251  虛擬的網(wǎng)絡地址
                    }
            }
    #service keepalived start
    #curl http://192.168.4.251