LVS+Keepalive實現 高可用集羣

首先準備兩臺已經安裝好LVS的機器
可參照這篇文檔快速搭建
這裏有一點要注意，不要執行對vip地址進行綁定，否則ip漂移會失敗

IP地址規劃

主機名	IP地址
lvs1	eth0:10.0.0.201 vip:10.0.0.3
lvs2	eth0:10.0.0.203 vip:10.0.0.3
nginx1	eth0:10.0.0.202 vip:10.0.0.3
nginx	eth0:10.0.0.200 vip:10.0.0.3

安裝Keepalive

yum install -y keepalived

修改keepalive配置文件

• lvs1

global_defs {
   router_id LVS_01
}

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 {
     10.0.0.3/24
    }
}

virtual_server 10.0.0.3 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 3
    protocol TCP

    real_server 10.0.0.200 80 {
        weight 1
        TCP_CHECK {
        connect_timeout 8
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }

    real_server 10.0.0.202 80 {
        weight 1
        TCP_CHECK {
        connect_timeout 8
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
}

• lvs2

global_defs {
   router_id LVS_02
}

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 {
     10.0.0.3/24
    }
}
virtual_server 10.0.0.3 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 3
    protocol TCP

    real_server 10.0.0.200 80 {
        weight 1
        TCP_CHECK {
        connect_timeout 8
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }

    real_server 10.0.0.202 80 {
        weight 1
        TCP_CHECK {
        connect_timeout 8
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
        }
    }
}

啓動keepalive

service keepalived start

檢查漂移狀態

• lvs1
  
• lvs2
  

此時將lvs1的keepalived停掉再觀察此時vip已經漂到lvs2上了

• 再對lvs負載進行驗證即可