一、準備：
1：和機房溝通好，哪臺機器和哪些ip需要漂移，並且保證漂移的ip，漂移後能外網訪問這個漂移的ip
2：yum -y install keepalived nignx

二、主設定：

cp /etc/keepalived/keepalived.conf  keepalived.conf-back
vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
     [email protected]
     [email protected]
 
   ---三個收件的郵箱(可不動)
     [email protected]
   }
   notification_email_from [email protected]   ---傳送的郵箱（可不動）
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
  #vrrp_strict       ---------註釋掉，要不然ping不通vip
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

~~~~~~~~~~~~~~~~~上面其他的都可以不動~~~~~~~~~~~~~~~~~~~~~~~~~

vrrp_instance VI_1 {
    state MASTER     -------------主
    interface eth0   ---注意填寫外網，網絡卡名稱
    virtual_router_id 51
    priority 100    ------------優先順序（主不用動）
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    202.60.230.94    --vip地址可以配置一個，也可以配置多個
	202.60.230.95
	202.60.230.97

	202.60.230.99
	202.60.230.101
	202.60.230.107
    }
}

下面全面刪除
 

三、從設定：

cp /etc/keepalived/keepalived.conf  keepalived.conf-back
vim /etc/keepalived/keepalived.conf


! Configuration File for keepalived

global_defs {
   notification_email {
     [email protected]
     [email protected]   ---三個收件的郵箱(可不動)
     [email protected]
   }
   notification_email_from 
 
[email protected]  ---傳送的郵箱（可不動）
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
   vrrp_skip_check_adv_addr
  #vrrp_strict     ---------註釋掉，要不然ping不通vip
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}

~~~~~~~~~~~~~~~~~上面其他的都可以不動~~~~~~~~~~~~~~~~~~~~~~~~~

vrrp_instance VI_1 {
    state BACKUP   -------------從
    interface eth0   ---注意填寫外網，網絡卡名稱
    virtual_router_id 51
    priority 80      ------------優先順序（比主低）
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        202.60.230.94  --vip地址可以配置一個，也可以配置多個
        202.60.230.95
        202.60.230.97

        202.60.230.99
        202.60.230.101
        202.60.230.107

    }
}

下面全面刪除

四、書寫指令碼自我檢查


vim /mnt/keep-chenk.sh

#!/bin/bash
for i in `seq 20`
do
AA=`ps -ef | grep /usr/local/nginx/sbin/nginx | grep -v grep | wc -l`
if [ $AA == 0 ];then
    systemctl stop keepalived
fi
sleep 3
done

五、啟動服務
    先啟動主keepalived，再啟動從keepalived


六、故障處理
    列如：主keepalived的nginx掛了，自動檢查就會停掉keepalived（ip會自動漂移到另外一臺nginx上）
	需要把ip再漂移回來，只需啟動主的nginx後再systemctl restart keepalievd就可以看到ip又漂回來了