Complete steps to achieve high availability with nginx combined with keepalived

yum install pcre-devel zlib zlib-devel openssl openssl-devel

tar zxvf nginx-1.12.2.tar.gz

mkdir -p /usr/local/nginx
./configure --prefix=/usr/local/nginx

make && make install

cd /usr/local/nginx/sbin/
./nginx
./nginx -s stop
./nginx -s start

yum install -y keepalived

vim /etc/keepalived/keepalived.conf

# Newly added configuration vrrp_script chk_http_port {
 script "/shell/nginx_check.sh" #script address interval 2 #check script execution interval weight 2 #weight}

vrrp_instance VI_1 {
 state MASTER #The master server is MASTER, the slave server is BACKUP
 interface eth0 #Network card virtual_router_id 51 #The virtual_router_id of the master and backup machines must be the same priority 100 #Different priorities for the master and backup machines. The master has a higher priority and the backup has a lower priority. The default is 100
 advert_int 1
 authentication
  auth_type PASS
  auth_pass 1111
 }
 #Virtual IP address virtual_ipaddress {
  192.168.126.88
 }
}

mkdir /shell/nginx_check.sh
vim /shell/nginx_check.sh

#!/bin/bash
A=`ps -C nginx –no-header |wc -l`
if [ $A -eq 0 ];then
  /usr/local/nginx/sbin/nginx
  sleep 2
  if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
    killall keepalived
  fi
fi

vrrp_instance VI_1 {
  state BACKUP #The master server is MASTER, the slave server is BACKUP
  interface eth0 #Network card virtual_router_id 51 #The virtual_router_id of the master and backup machines must be the same priority 50 #Different priorities for the master and backup machines, the master has a higher priority and the backup has a lower value advert_int 1
  authentication
    auth_type PASS
    auth_pass 1111
  }
  #Virtual IP address virtual_ipaddress {
    192.168.126.88
  }
}

service keepalived start

ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
  inet6 ::1/128 scope host 
    valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
  link/ether 00:0c:29:4f:31:ce brd ff:ff:ff:ff:ff:ff
  inet 192.168.126.100/24 ​​brd 192.168.126.255 scope global eth0
  inet 192.168.126.88/32 scope global eth0
  inet6 fe80::20c:29ff:fe4f:31ce/64 scope link 
    valid_lft forever preferred_lft forever

service iptables stop
# Check whether the firewall starts automatically at boot time chkconfig --list | grep iptables
chkconfig iptables off

http://192.168.126.88/