keepalived双机热备nginx的配置方法

yum install keepalived

#!/bin/bash

count=0
for (( k=0; k<2; k++ ))
do
 check_code=$( curl --connect-timeout 3 -sL -w "%{http_code}\\n" http://localhost:81 -o /dev/null )
 if [ "$check_code" != "200" ]; then
  count=count +1
  continue
 else
  count = 0
  break
 fi
done
if [ "$count" != "0" ]; then
 killall keepalived
 exit 1
else
 exit 0
fi

vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived
vrrp_script chk_nginx {
 script "/etc/keepalived/check_nginx.sh" # 心跳检测角本
 interval 2 #脚本执行间隔，每2s检测一次
 weight -5 #脚本结果导致的优先级变更，检测失败（脚本返回非0）则优先级 -5
 fall 3 #检测连续2次失败才算确定是真失败。会用weight减少优先级（1-255之间）
 rise 2 #检测1次成功就算成功。但不修改优先级
}
vrrp_instance VI_1 {
 state MASTER #指定keepalived的角色，MASTER表示此主机是主服务器，BACKUP表示此主机是备用服务器
 interface eth0 #指定监测网络的接口。实例绑定的网卡，因为在配置虚拟IP的时候必须是在已有的网卡上添加的
 mcast_src_ip 192.168.0.118 ## 发送多播数据包时的源IP地址
 virtual_router_id 51 #虚拟路由标识，MASTER和BACKUP必须是一致的
 priority 100 #定义优先级，数字越大，优先级越高
 advert_int 2 #设定MASTER与BACKUP负载均衡器之间同步检查的时间间隔，单位是秒
 authentication { #设置验证类型和密码。主从必须一样
  auth_type PASS #设置vrrp验证类型，主要有PASS和AH两种
  auth_pass 1111 #设置vrrp验证密码，在同一个vrrp_instance下，MASTER与BACKUP必须使用相同的密码才能正常通信
 }
 virtual_ipaddress {
  192.168.0.119 #VRRP 虚拟地址 如果有多个VIP，换行填写
 }
 track_script {
  chk_nginx # 心跳脚本，即在 vrrp_script 部分指定的名字
 }
}

! Configuration File for keepalived
vrrp_script chk_nginx {
 script "/etc/keepalived/check_nginx.sh"
 interval 2
 weight -5
}
vrrp_instance VI_1 {
 state BACKUP # 修改
 interface eth0
 mcast_src_ip 192.168.0.105 # 修改 为本机IP
 virtual_router_id 51
 priority 90 #数字变小
 advert_int 2
 authentication {
  auth_type PASS
  auth_pass 1111
 }
 virtual_ipaddress {
  192.168.0.119
 }
 track_script {
  chk_nginx
 }
}

service keepalived start

rpm -qa zlib
rpm -qa zlib-devel
rpm -qa openssl
rpm -qa openssl-devel
rpm -qa pcre
rpm -qa pcre-devel
rpm -qa gcc

yum -y install gcc zlib zlib-devel openssl openssl-devel pcre-devel

mkdir nginxsrc
cd nginxsrc/

wget http://nginx.org/download/nginx-1.13.9.tar.gz
tar zxvf nginx-1.13.9.tar.gz
cd nginx-1.13.9/

./configure --prefix=/usr/local/nginx --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module

make&&make install 

/usr/local/nginx/sbin/nginx 

ps aux|grep nginx 

vi /etc/rc.local

/usr/local/nginx/sbin/nginx 

vi /usr/local/nginx/conf/nginx.conf

vi /usr/local/nginx/html/index.html

/usr/local/nginx/sbin/nginx -s reload

curl 192.168.0.119:81

 /usr/local/nginx/sbin/nginx -s stop

 curl 192.168.0.119:81