Keepalived高可用叢集

目錄

​​Keepalived​​

​​Keepalived實作主備網站​​

Keepalived

Keepalived軟體起初是專為LVS負載均衡軟體設計的，用來管理并監控LVS叢集系統中各個伺服器節點的狀态，後來又加入了實作高可用的VRRP功能。是以 Keepalived 除了能夠管理LVS軟體外，還可以作為其他服務（例如：NGINX、Haproxy、MySQL等）的高可用解決方案。 Keepalived軟體主要是通過 VRRP 協定實作高可用功能的

Keepalived 服務的三個重要功能：

• 管理LVS負載均衡軟體
• 實作LVS叢集節點的健康檢查中
• 作為系統網絡服務的高可用性（failover）

配置檔案： /etc/keepalived/keepalived.conf

完整的 keepalived 配置檔案由3部分組成：

• 全局定義部分     global_defs vrrp
• 執行個體定義部分     vrrp_instance VI_1
• 虛拟伺服器定義部分     virtual_server

Keepalived實作主備網站

某學校計劃搭建一個校内論壇網站，為了保證并發量的需求，決定使用兩台NGINX伺服器提供WEB服務，通過Keepalived實作兩台WEB伺服器的負載均衡和高可用。

我們這裡隻配置keepalived部分的配置

Server1(Master)

• 安裝keepalived： yum  -y install  keepalived
• 修改配置檔案 /etc/keepalived/keepalived.conf
• 啟動keepalived：systemctl start keepalived

global_defs {
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER   ######
    interface eno16777736  #######
    virtual_router_id 51    #########master=backup
    priority 150    #########master>backup
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {             ##對外的虛拟ip
        192.168.10.100   #############master=backup
    }
}      

Server2(Backup)：

• 安裝keepalived： yum  -y install  keepalived
• 修改配置檔案 /etc/keepalived/keepalived.conf
• 啟動keepalived：systemctl start keepalived

global_defs {
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER   ######
    interface eno16777736  #######
    virtual_router_id 51    #########master=backup
    priority 100    #########master>backup
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {            ##對外的虛拟ip
        192.168.10.100   #############master=backup
    }
}