基于haproxy负载均衡实现lamp与apache的高可用

news2024/11/26 8:27:37

环境准备

IP	主机名	服务	系统
192.168.47.10	node1	ansible	centos8
192.168.47.20	node2	lamp	centos8
192.168.47.30	node3	apache	centos8
192.168.47.40	node4	haproxy	centos8

基于上一篇的文章在node3主机上部署apache

一、部署haproxy

准备主机清单组织

//创建角色
[student@server roles]$ ansible-galaxy init haproxy


[student@server ansible]$ cat inventory
[webservers]
node1
node2

[haproxy]
node3

主清单任务

[student@server haproxy]$ cat tasks/main.yml 
---
# tasks file for haproxy
- name: install haproxy
  yum: 
    name: haproxy
    state: present

- name: cp config
  template: 
    src: haproxy.cfg.j2    ——将所修改的配置覆盖到指定的配置文件
    dest: /etc/haproxy/haproxy.cfg

- name: restart haproxy
  service: 
    name: haproxy
    state: restarted
    enabled: yes

先在root中下载好haproxy服务，以便读取配置文件

[root@node3 network-scripts]# yum -y install haproxy
Last metadata expiration check: 0:22:53 ago on Tue 08 Nov 2022 11:47:21 AM CST.
Package haproxy-1.8.27-2.el8.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete!

[student@server haproxy]$ cp /etc/haproxy/haproxy.cfg templates/haproxy.cfg.j2

//定义好主机清单
[student@server haproxy]$ cat templates/haproxy.cfg.j2 

frontend main
    bind *:80        ——修改为80端口
    acl url_static       path_beg       -i /static /images /javascript /stylesheets


backend app
    balance     roundrobin
{% for hh in groups.webservers %}      ——定义其主机清单中的webservers
server {{ hostvars[hh].ansible_fqdn }} {{ hostvars[hh].ansible_default_ipv4.address }}:80 check
{% endfor %}