5.Lvs+Keepalived健康檢查

時間 2019-11-26

標籤 5.lvs+keepalived lvs keepalived 健康檢查欄目負載均衡简体版

原文原文鏈接

1. Nginx+keepalived對後端服務器心跳檢查(須要自定義腳本)

原理：Keepalived並不跟nginx耦合，它倆徹底不是一家人可是keepalived提供一個機制：讓用戶自定義一個shell腳本去檢測用戶本身的程序，返回狀態給keepalived就能夠了nginx

#MASTER節點sql

global_defs {
}

vrrp_script chk_health { script "[[ `ps -ef | grep nginx | grep -v grep | wc -l` -ge 2 ]] && exit 0 || exit 1" interval 1 #每隔1秒執行上述的腳本，去檢查用戶的程序ngnix weight -2 } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 1 priority 100 advert_int 2 authentication { auth_type PASS auth_pass 1111 } track_script { chk_health } virtual_ipaddress { 10.0.0.10/24 } notify_master "/usr/local/keepalived/sbin/notify.sh master" notify_backup "/usr/local/keepalived/sbin/notify.sh backup" notify_fault "/usr/local/keepalived/sbin/notify.sh fault" }

#添加切換通知腳本：vi /usr/local/keepalived/sbin/notify.shshell

#!/bin/bash

case "$1" in master) /usr/local/nginx/sbin/nginx exit 0 ;; backup) /usr/local/nginx/sbin/nginx -s stop /usr/local/nginx/sbin/nginx exit 0 ;; fault) /usr/local/nginx/sbin/nginx -s stop exit 0 ;; *) echo 'Usage: notify.sh {master|backup|fault}' exit 1 ;; esac

#添加執行權限：chmod +x /usr/local/keepalived/sbin/notify.sh後端

global_defs {
}

vrrp_script chk_health {
    script "[[ `ps -ef | grep nginx | grep -v grep | wc -l` -ge 2 ]] && exit 0 || exit 1" interval 1 weight -2 } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 1 priority 99 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_health } virtual_ipaddress { 10.0.0.10/24 } notify_master "/usr/local/keepalived/sbin/notify.sh master" notify_backup "/usr/local/keepalived/sbin/notify.sh backup" notify_fault "/usr/local/keepalived/sbin/notify.sh fault" }

#在第二臺機器上添加notify.sh腳本瀏覽器

#分別在兩臺機器上啓動keepalivedbash

service keepalived start服務器

chkconfig keepalived on網絡

2. Lvs+keepalived對後端服務器心跳檢查(不須要自定義腳本)

　　1. 在兩臺（192.168.232.201和192.168.232.205） Lvs轉發服務器上安裝ipvsadm和Keepalived：yum -y install ipvsadm/keepalived oop

　　 2. 修改配置文件：vi /etc/keepalived/keepalived.confurl

　　　　主機：Lvs+keepalived（MASTER）

global_defs {
   #指定keepalived在發生切換時須要發送email到的對象
   notification_email { 
      root@localhost    #郵件接收者
   }
   notification_email_from lvs@localhost  #郵件發送者
   smtp_server 127.0.0.1     #郵件服務器地址，如未安裝，使用本地
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

#IP漂移協議
vrrp_instance VI_1 {
    state MASTER  #指定A節點爲主節點 備分機上設置爲BACKUP便可
    interface eth0  #綁定IP漂移的網絡接口，在該接口上綁定VIP
    virtual_router_id 51   #VRRP組名，兩個節點的設置必須同樣
    priority 100  
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.232.206/24 dev eth0 label eth0:1   #綁定VIP
    }
}

#只接收80端口過來的請求
virtual_server 192.168.232.206 80 {
    delay_loop 6
    lb_algo wlc   #輪循
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP

    #RS服務器1
    real_server 192.168.232.200 80 {
        weight 1
    　　 #健康檢查
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    #RS服務器2
    real_server 192.168.232.204 80 {
        weight 1
    　　 #健康檢查
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}

　　　　備機：Lvs+keepalived（BACKUP）

global_defs {
   #指定keepalived在發生切換時須要發送email到的對象
   notification_email { 
      root@localhost    #郵件接收者
   }
   notification_email_from lvs@localhost  #郵件發送者
   smtp_server 127.0.0.1     #郵件服務器地址，如未安裝，使用本地
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

#IP漂移協議
vrrp_instance VI_1 {
    state BACKUP  #指定A節點爲主節點 備分機上設置爲BACKUP便可
    interface eth0  #綁定IP漂移的網絡接口，在該接口上綁定VIP
    virtual_router_id 51   #VRRP組名，兩個節點的設置必須同樣
    priority 99  
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.232.206/24 dev eth0 label eth0:1   #綁定VIP
    }
}

#只接收80端口過來的請求
virtual_server 192.168.232.206 80 {
    delay_loop 6
    lb_algo wlc   #輪循
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP

    #RS服務器1
    real_server 192.168.232.200 80 {
        weight 1
    　　 #健康檢查
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

    #RS服務器2
    real_server 192.168.232.204 80 {
        weight 1
    　　 #健康檢查
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}