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systemctl stop firewalld.service
systemctl disable firewalld.service
wget https://www.keepalived.org/software/keepalived-1.3.5.tar.gz
wget http://nginx.org/download/nginx-1.18.0.tar.gz
tar -xf keepalived-1.3.5.tar.gz -C /usr/src/
tar -xf nginx-1.18.0.tar.gz -C /usr/src/

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yum -y install gcc-c++ pcre pcre-devel zlib zlib-devel openssl openssl-devel libnl libnl-devel libnfnetlink libnfnetlink-devel
useradd -s /sbin/nologin nginx -M
cd /usr/src/nginx-1.18.0/
./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with-http_stub_status_module --with-http_ssl_module
make && make install

vim /etc/profile
export PATH=$PATH:/usr/local/nginx/sbin

source /etc/profile
nginx -c /usr/local/nginx/conf/nginx.conf
echo "this is 172.16.52.151 page" > /usr/local/nginx/html/index.html

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cd /usr/src/keepalived-1.3.5/
sudo ./configure --prefix=/usr/local/keepalived/ --with-kernel-dir=/usr/src/kernels/3.10.0-514.el7.x86_64/
sudo make install
cp /usr/src/keepalived-1.3.5/keepalived/etc/init.d/keepalived /etc/init.d/
mkdir -p /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf  /etc/keepalived/
cp /usr/src/keepalived-1.3.5/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

vim /etc/profile
export PATH=$PATH:/usr/local/keepalived/sbin
source /etc/profile

vim /etc/keepalived/keepalived.conf

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! Configuration File for keepalived

global_defs {
   notification_email {
     baoguo.ding@foxmail.com
   }
   notification_email_from root@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_script chk_nginx {
   script  "/data/sh/check_nginx.sh"
   interval 2
   weight 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 51
    priority 90
    advert_int 5
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.16.52.188
    }
    track_script {
        chk_nginx
    }
}

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mkdir -p /data/sh/

vim /data/sh/check_nginx.sh
#!/bin/bash
#auto  check  nginx  process
#by  author  baoguo
killall  -0   nginx
if  [[ $? -ne 0 ]];then
service keepalived stop
fi


chmod +x /data/sh/check_nginx.sh

vim /lib/systemd/system/keepalived.service
PIDFile=/var/run/keepalived.pid

service keepalived start
service keepalived status
service keeplived stop
service keeplived restart

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vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     baoguo.ding@foxmail.com
   }
   notification_email_from root@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_script chk_nginx {
   script  "/data/sh/check_nginx.sh"
   interval 2
   weight 2
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    lvs_sync_daemon_inteface ens33
    virtual_router_id 51
    priority 100
    advert_int 5
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.16.52.188
    }
    track_script {
        chk_nginx
    }
}

vrrp_instance VI_2 {
    state BACKUP
    interface ens33
    lvs_sync_daemon_inteface ens33
    virtual_router_id 52
    priority 90
    advert_int 5
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 2222
    }
    virtual_ipaddress {
        172.16.52.200
    }
    track_script {
        chk_nginx
    }
}

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vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
   notification_email {
     baoguo.ding@foxmail.com
   }
   notification_email_from root@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_script chk_nginx {
   script  "/data/sh/check_nginx.sh"
   interval 2
   weight 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    lvs_sync_daemon_inteface ens33
    virtual_router_id 51
    priority 90
    advert_int 5
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.16.52.188
    }
    track_script {
        chk_nginx
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface ens33
    lvs_sync_daemon_inteface ens33
    virtual_router_id 52
    priority 100
    advert_int 5
    nopreempt
    authentication {
        auth_type PASS
        auth_pass 2222
    }
    virtual_ipaddress {
        172.16.52.200
    }
    track_script {
        chk_nginx
    }
}

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service keepalived restart