Welcome to ShowDoc!

1. Install the basic package:

yum -y install libnl libnl-devel

2. Upload package:

tar -zxvf keepalived-2.0.20.tar.gz -C /data/imas/base_soft
mkdir -p /data/imas/base_soft/keepalived
cd /data/imas/base_soft/keepalived-2.0.20
./configure --prefix =/data/imas/base_soft/keepalived --sysconf=/etc
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start When keepalived, the default will go to the /etc/keepalived directory to find the keepalived.conf file
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3. Compile and install:

make && make install
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cd /etc/keepalived/

4. Modify keepalived.conf

Master node configuration:
! Configuration File for keepalived

global_defs {
   router_id keep_26
}
vrrp_script check_nginx_alive {
   script "/etc/keepalived/check_nginx_alive_or_not.sh"
   interval 10  #每隔10秒运行上一行的脚本
   weight -10 # 如果脚本运行成功，则权重-10
}
vrrp_instance VI_1 {
    state MASTER
    # 当前实例绑定的网卡
    interface ens160
    # 保证主备节点一致
    virtual_router_id 51
    # 优先级/权重，谁的优先级高，在MASTER挂掉以后，就能成为MASTER
    priority 100
    # 主备之间同步检查的时间间隔，默认1s
    advert_int 1
    # 认证授权的密码，防止非法节点的进入
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    track_script {
        check_nginx_alive # 追踪 nginx脚本
    }
    virtual_ipaddress {
        172.16.11.31
    }
}

Standby node configuration:

! Configuration File for keepalived

global_defs {
    
    
   router_id keep_26
}
vrrp_script check_nginx_alive {
    
    
   script "/etc/keepalived/check_nginx_alive_or_not.sh"
   interval 10  #每隔10秒运行上一行的脚本
   weight -10 # 如果脚本运行成功，则权重-10
}
vrrp_instance VI_1 {
    
    
    state MASTER
    # 当前实例绑定的网卡
    interface ens160
    # 保证主备节点一致
    virtual_router_id 51
    # 优先级/权重，谁的优先级高，在MASTER挂掉以后，就能成为MASTER
    priority 100
    # 主备之间同步检查的时间间隔，默认1s
    advert_int 1
    # 认证授权的密码，防止非法节点的进入
    authentication {
    
    
        auth_type PASS
        auth_pass 1111
    }
    track_script {
    
    
        check_nginx_alive # 追踪 nginx脚本
    }
    virtual_ipaddress {
    
    
        172.16.11.31
    }
}

5. nginx detection script

cd /etc/keepalived
vi check_nginx_alive_or_not.sh
The content of the script is as follows:
#!/bin/bash
A= ps -C nginx --no-header |wc -l
#Determine whether nginx is down, if it is down, try to restart
if [ $A -eq 0 ]; then
#/data/imas /base_soft/nginx/sbin/nginx
systemctl start nginx
#Wait for a while and check nginx again. If it does not start successfully, stop keepalived and make it start the standby machine
sleep 3
if [ ps -C nginx --no-header |wc -l-eq 0 ];then
killall keepalived
fi
fi

6、whereis keepalived

keepalived log file path: /var/log/messages

7. Configure keepalived to boot automatically:

systemctl enable keepalived
systemctl daemon-reload
systemctl start keepalived
systemctl status keepalived
systemctl restart keepalived

8. Check the virtual ip access status:

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Visit nginx address
http://172.16.11.31

keepalived+nginx installation