lvs+keepalived+Haproxy+web(nginx apache)四七层负载均衡高可用集群构建

以下步骤为个人实验环境

简单原理：客户端访问对外入口lvs+keepalived（四层），lvs将请求负载至后端两台haproxy（七层），haproxy再将请求负载至后端服务器。

如下拓扑图：

​​​​​​​​一、准备工作

1、9台虚拟机

主机	IP	作用
	192.168.137.100	虚拟IP
lvs-keepalived-01	192.168.137.145	LVS将请求负载至haproxy中的一台
lvs-keepalived-02	192.168.137.146	LVS-KEEPALIVED的备份
haproxy	192.168.137.147	haproxy-01 将请求负载至后端web
haproxy	192.168.137.148	haproxy-02 将请求负载至后端web
web1	192.168.137.141	web1静态服务器
web2	192.168.137.142	web2静态服务器
web3	192.168.137.143	web3动态服务器
web4	192.168.137.144	web4动态服务器
client	192.168.137.151	客户端虚拟机用于测试

配置域名/etc/hosts

二、安装软件及配置
1、在两台lvs-keepalived上安装 ipvsadm和keepalived

yum install -y ipvsadm keepalived

2、在两台haproxy虚拟机上安装haproxy

yum install -y haproxy

3、web3、web4安装Nginx PHP

yum install -y epel-release
yum install -y nginx php-fpm

4、配置网页
web1、web2在/var/www/html/下各自创建index.html，测试内容自定。
web3、web4在/usr/share/nginx/html/下各自创建index.php,添加如下内容

<?
phpinfo()
php?>

配置nginx，添加php模块

# For more information on configuration, see:
#   * Official English Documentation: http://nginx.org/en/docs/
#   * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
   
    worker_connections 1024;
}

http {
   
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfi