haproxy负载均衡部署

简介

HAProxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代理，支持虚拟主机，它是免费、快速并且可靠的一种解决方案。HAProxy特别适用于那些负载特大的web站点，这些站点通常又需要会话保持或七层处理。HAProxy运行在当前的硬件上，完全可以支持数以万计的并发连接。并且它的运行模式使得它可以很简单安全的整合进您当前的架构中， 同时可以保护你的web服务器不被暴露到网络上。

HAProxy是一个开源的、高性能的、基于TCP(第四层）和HTTP（第七层）应用的负载均衡软件，借助HAProxy可以快速、可靠的提供基于TCP和HTTP应用的负载均衡解决方案

环境

名称	主机名	IP
web服务端	wyt1	192.168.153.20
httpd服务端	wyt2	192.168.153.22
httpd服务端	wyt3	192.168.153.25

1.服务端安装httpd并启动服务

[[e-mail] ~]# cd /var/www/html/
[[e-mail] html]# echo 'node01' > index.html
[[e-mail] html]# systemctl enable --now httpd
[[e-mail] ~]# cd /var/www/html/
[[e-mail] html]# echo 'node02' > index.html
[[e-mail] html]# systemctl enable --now httpd

2.安装依赖包

[[e-mail] ~]# yum -y install make  zlib-devel gcc gcc-c++ pcre-devel bzip2-devel openssl-devel systemd-devel

3.创建用户和组

[[e-mail] ~]# useradd -r -M -s /sbin/nologin haproxy
[[e-mail] ~]# id haproxy
uid=996(haproxy) gid=994(haproxy) 组=994(haproxy)

4.下载安装包并编译安装

[[e-mail] ~]# tar xf haproxy-2.1.3.tar.gz 
[[e-mail] ~]# ls
anaconda-ks.cfg  haproxy-2.1.3  haproxy-2.1.3.tar.gz
[[e-mail] ~]# cd haproxy-2.1.3
[[e-mail] haproxy-2.1.3]# make -j $(nproc)  \
TARGET=linux-glibc  \
USE_OPENSSL=1  \
USE_ZLIB=1  \
USE_PCRE=1  \
USE_SYSTEMD=1
[[e-mail] haproxy-2.1.3]# make install
[[e-mail] haproxy-2.1.3]# which haproxy 
/usr/local/sbin/haproxy

5.配置各个负载的内核参数

[[e-mail] haproxy-2.1.3]# echo 'net.ipv4.ip_nonlocal_bind = 1' >>  /etc/sysctl.conf
[[e-mail] haproxy-2.1.3]# echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf
[[e-mail] haproxy-2.1.3]# sysctl  -p
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1

6.提供配置文件

[[e-mail] ~]# mkdir /etc/haproxy
[[e-mail] ~]# vim /etc/haproxy/haproxy.cfg

#--------------全局配置----------------
global
    log 127.0.0.1 local0  info
    #log loghost local0 info
    maxconn 20480
#chroot /usr/local/haproxy
    pidfile /var/run/haproxy.pid
    #maxconn 4000
    user haproxy
    group haproxy
    daemon
#---------------------------------------------------------------------
#common defaults that all the 'listen' and 'backend' sections will
#use if not designated in their block
#---------------------------------------------------------------------
defaults
    mode http
    log global
    option dontlognull
    option httpclose
    option httplog
    #option forwardfor
    option redispatch
    balance roundrobin
    timeout connect 10s
    timeout client 10s
    timeout server 10s
    timeout check 10s
    maxconn 60000
    retries 3
#--------------统计页面配置------------------
listen admin_stats
    bind 0.0.0.0:8189
    stats enable
    mode http
    log global
    stats uri /haproxy_stats
    stats realm Haproxy\ Statistics
    stats auth admin:admin
    #stats hide-version
    stats admin if TRUE
    stats refresh 30s
#---------------web设置-----------------------
listen webcluster
    bind 0.0.0.0:80
    mode http
    #option httpchk GET /index.html
    log global
    maxconn 3000
    balance roundrobin
    cookie SESSION_COOKIE insert indirect nocache
    server web01 192.168.153.22:80 check inter 2000 fall 5
    server web02 192.168.153.25:80 check inter 2000 fall 5
    #server web01 192.168.80.250:80 cookie web01 check inter 2000 fall 5

7.配置服务启动脚本

[[e-mail] ~]# vim /usr/lib/systemd/system/haproxy.service
[Unit]
Description=HAProxy Load Balancer
After=syslog.target network.target

[Service]
ExecStartPre=/usr/local/sbin/haproxy/ -f /etc/haproxy/haproxy.cfg   -c -q
ExecStart=/usr/local/sbin/haproxy/ -Ws -f /etc/haproxy/haproxy.cfg  -p /var/run/haproxy.pid
ExecReload=/bin/kill -USR2 

[Install]
WantedBy=multi-user.target

[[e-mail] ~]# systemctl daemon-reload

8.启用日志

[[e-mail] ~]# vim /etc/rsyslog.conf
local0.*        /var/log/haproxy.log //添加此行内容
[[e-mail] ~]#  systemctl restart rsyslog

9.启动服务

[[e-mail] ~]# systemctl enable --now haproxy
[[e-mail] ~]# ss -antl |grep 8189
LISTEN     0      128          *:8189                     *:*

10.登陆web界面

用户名：admin 密码：admin