客戶端 cli.noise.org : 10.0.0.7 - cli.noise.org

keepalived1 + nginx - 10.0.0.34 -ka1.noise.org

keepalived2 + ngixn -10.0.0.22 -ka2.noise.org

後臺web伺服器1: 10.0.0.35 - rs1.noise.org

後臺web伺服器2: 10.0.0.36 - rs2.noise.org

==========================================================

ka1.noise.org - keepalived.conf

  
global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from [email protected]
   smtp_server 
 
127.0.0.1
   smtp_connect_timeout 30
   router_id ka1.noise.org 　　　　　　-》 唯一ID
   vrrp_mcast_group 224.0.100.100    -》 多播地址
}


vrrp_script check_nginx {
    script "/data/check_nginx.sh"　　-》 檢查指令碼，nginx服務掛掉，自動重啟
    interval 1
    weight -30
    fall 3
    rise 5
    timeout 2
}


vrrp_instance VI_1 {　　　　　　-》 叢集VI_1, ka1為主節點
    state MASTER　　　　　　　　-》 節點狀態
    interface eth0
    virtual_router_id 
 
66　　　　-》 唯一叢集ID 
    #nopreempt
    priority 100　　　　　　　　-》 節點優先順序
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        10.0.0.20/24 dev eth0 label eth0:1　　-》 叢集漂移VIP
    }

    track_interface {
        eth0
    }

    track_script {
        check_nginx
    }
}

vrrp_instance VI_2 {　　-》 叢集VI_2
    state BACKUP　　　　　　-> 當前節點作為子節點
    interface eth0
    virtual_router_id 
 
88　　-》 唯一叢集ID
    #nopreempt
    priority 80　　　　　　-》 節點優先順序
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        10.0.0.30/24 dev eth0 label eth0:1　　-》 叢集VIP
    }

    track_interface {
        eth0
    }

    track_script {
        check_nginx
    }
}

===============================================

此為ka2.noise.org的配置，部分配置與ka1.noise.org相反

! Configuration File for keepalived

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from [email protected]
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka2.noise.org
   vrrp_mcast_group 224.0.100.100
}


vrrp_script check_nginx {
    script "/data/check_nginx.sh"
    interval 1
    weight -30
    fall 3
    rise 5
    timeout 2
}


vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 66
    #nopreempt
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        10.0.0.20/24 dev eth0 label eth0:1
    }

    track_interface {
        eth0
    }

    track_script {
        check_nginx
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface eth0
    virtual_router_id 88
    #nopreempt
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        10.0.0.30/24 dev eth0 label eth0:1
    }

    track_interface {
        eth0
    }

    track_script {
        check_nginx
    }
}

===================================

兩個ka節點nginx配置一樣，負責反向代理

http {
    upstream websrvs {
        server 10.0.0.35:80 weight=1;
        server 10.0.0.36:80 weight=1;
    }

    server {
        listen 80;
        location / {
            proxy_pass http://websrvs/;
        }
    }

}

==================================

[19:07:33 root@ka1 ~]#cat /data/check_nginx.sh 
#!/bin/bash
#
#**************************************************************************************
#Author:                                   Noise Lys
#QQ:                                       578110218
#Date:                                     2021-08-29
#Filename:                                 /data/check_nginx.sh
#URL:                                      https://www.cnblogs.com/noise/
#Description:                              The test script
#Copyright (C):                            2021 All rights reserved
#**************************************************************************************
/usr/bin/killall -0 nginx || systemctl restart nginx 

=================================

開始檢查結果，訪問10.0.0.20即叢集VI_1的VIP時，主節點ka1.noise.org工作，ka2.noise.org不工作
但是訪問10.0.0.30即叢集VI_2的VIP時，主節點ka2.noise.org工作，ka1.noise.org不工作

[19:00:48 root@cli ~]#curl 10.0.0.20
rs1.noise.org
[19:00:49 root@cli ~]#curl 10.0.0.20
rs2.noise.org
[19:00:49 root@cli ~]#curl 10.0.0.20
rs1.noise.org
[19:00:49 root@cli ~]#curl 10.0.0.20
rs2.noise.org
[19:00:50 root@cli ~]#curl 10.0.0.20
rs1.noise.org
[19:00:50 root@cli ~]#curl 10.0.0.30
rs1.noise.org
[19:00:52 root@cli ~]#curl 10.0.0.30
rs2.noise.org
[19:00:53 root@cli ~]#curl 10.0.0.30
rs1.noise.org
[19:00:53 root@cli ~]#curl 10.0.0.30
rs2.noise.org