實驗環境：controller3,controller4為後端web服務器，controller1,controller2為nginx負載均衡服務器，用keepalived實現主備模式的高可用

controller1 IP：9.110.187.120　　10.1.1.120

controller2 IP：9.110.187.121　　10.1.1.121

controller3 IP：10.1.1.122

controller4 IP：10.1.1.123

1.controller3,controller4安裝httpd，提供簡單的測試頁面

2.controller1,controller2安裝nginx，並配置後端服務器組

controller2配置和效果

controller1配置同controller2

3.在controller1上配置keepalived，實現對nginx的高可用

! Configuration File for keepalived

global_defs {
   notification_email {
        [email protected]    #通知郵箱
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1    #郵箱服務器
   smtp_connect_timeout 
 
30    #郵箱超時時間
   router_id controller1    #本機route ID
   vrrp_mcast_group4 224.0.32.18 #組播地址
}

vrrp_instance keepnginx {    #自定義虛擬路由實例
    state MASTER    #本機虛擬路由狀態為master
    interface eno16777736    #心跳傳遞地址
    virtual_router_id 60    #虛擬路由id
    priority 100    #權重100
    advert_int 1    #1秒檢測
    authentication {    #檢測方式密碼，
 
123456
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        9.110.187.60/24    dev    eno16777736      label   eno16777736:1 #虛擬ip，虛擬ip所在網卡（內網）
    }
}

track_interface {    #追蹤檢測網卡
        eno16777736　　#外網網卡提供訪問
        eno33554960　　#內網網卡訪問後端WEB服務器
}
        

controller2設置為備用

! Configuration File for keepalived

global_defs {
   notification_email {
        [email protected]
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id controller2
}

vrrp_instance keepnginx {
    state BACKUP
    interface eno16777736
    virtual_router_id 60
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        9.110.187.60/24 dev     eno16777736     label   eno16777736:1
    }
}

track_interface {
        eno16777736
        eno33554960
}

此時虛擬的Ip 9.110.187.60 因為controller1權重100運行在controller1上，停止controller1的keepalived服務後轉移至controller2上，訪問9.110.187.60 可輪詢方式訪問後端vipserver

02-keepalived實現對nginx服務的高可用（主備）