haproxy配置负载均衡

haproxy介绍

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安装

在RS配置httpd服务
[root@RS1 ~]# systemctl disable --now firewalld.service
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@RS1 ~]# getenforce 
Disabled
[root@RS1 ~]# yum -y install httpd
[root@RS1 ~]# systemctl enable --now httpd
Created symlink /etc/systemd/system/multi-user.target.wants/httpd.service → /usr/lib/systemd/system/httpd.service.
[root@RS1 ~]# echo "123" > /var/www/html/index.html

[root@RS2 ~]# systemctl disable --now firewalld.service
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@RS2 ~]# getenforce 
Disabled
[root@RS2 ~]# yum -y install httpd
[root@RS2 ~]# systemctl enable --now httpd
Created symlink /etc/systemd/system/multi-user.target.wants/httpd.service → /usr/lib/systemd/system/httpd.service.
[root@RS2 ~]# echo "456" > /var/www/html/index.html

配置DR
[root@DR ~]# systemctl disable --now firewalld.service
Removed /etc/systemd/system/multi-user.target.wants/firewalld.service.
Removed /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
[root@DR ~]# getenforce 
Disabled

安装服务
[root@DR ~]# yum -y install openssl make gcc pcre-devel bzip2-devel openssl-devel systemd-devel

创建用户
[root@DR ~]# useradd -r -M -s /sbin/nologin haproxy

上传压缩包
[root@DR ~]# ls
公共  视频  文档  音乐  anaconda-ks.cfg       initial-setup-ks.cfg
模板  图片  下载  桌面  haproxy-2.4.0.tar.gz
解压压缩包
[root@DR ~]# tar xf haproxy-2.4.0.tar.gz 
[root@DR ~]# ls
公共  视频  文档  音乐  anaconda-ks.cfg  haproxy-2.4.0.tar.gz
模板  图片  下载  桌面  haproxy-2.4.0    initial-setup-ks.cfg

[root@DR haproxy-2.4.0]# ls
addons    CHANGELOG     doc       include  MAINTAINERS  reg-tests  src      VERDATE
admin     CONTRIBUTING  examples  INSTALL  Makefile     ROADMAP    SUBVERS  VERSION
BRANCHES  dev           haproxy   LICENSE  README       scripts    tests
[root@DR haproxy-2.4.0]# make clean
[root@DR haproxy-2.4.0]# make -j $(nproc) TARGET=linux-glibc USE_OPENSSL=1 USE_PCRE=1 USE_SYSTEMD=1         //过程省略
[root@DR haproxy-2.4.0]# make install PREFIX=/usr/local/haproxy

配置内核参数
[root@DR ~]# echo 'net.ipv4.ip_nonlocal_bind = 1' >>  /etc/sysctl.conf
[root@DR ~]# echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf
[root@DR ~]# sysctl  -p
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.ip_forward = 1

提供配置文件
[root@DR ~]# mkdir /etc/haproxy
[root@DR ~]# cd /etc/haproxy/
[root@DR haproxy]# cat > /etc/haproxy/haproxy.cfg <<EOF
#--------------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 192.168.145.170:80 check inter 2000 fall 5
    #server web02 192.168.145.171:80 cookie web01 check inter 2000 fall 5
EOF

haproxy.service文件编写
[root@DR ~]# cat > /usr/lib/systemd/system/haproxy.service <<EOF
[Unit]
Description=HAProxy Load Balancer
After=syslog.target network.target

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

[Install]
WantedBy=multi-user.target
EOF
[root@DR ~]# systemctl daemon-reload

开启日志
[root@DR ~]# vim /etc/rsyslog.conf
local0.* /var/log/haproxy.log       加入此行

设置开机自启
[root@DR ~]# systemctl enable --now haproxy
Created symlink /etc/systemd/system/multi-user.target.wants/haproxy.service → /usr/lib/systemd/system/haproxy.service.
[root@DR ~]# systemctl status haproxy.service 
● haproxy.service - HAProxy Load Balancer
   Loaded: loaded (/usr/lib/systemd/system/haproxy.service; enabled; vendor preset: >
   Active: active (running) since Mon 2021-10-18 02:01:59 CST; 5s ago
  Process: 106583 ExecStartPre=/usr/local/haproxy/sbin/haproxy -f /etc/haproxy/hapro>
 Main PID: 106585 (haproxy)
    Tasks: 2 (limit: 23862)
   Memory: 7.7M
   CGroup: /system.slice/haproxy.service
           ├─106585 /usr/local/haproxy/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg >
           └─106588 /usr/local/haproxy/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg >

10月 18 02:01:59 DR systemd[1]: Starting HAProxy Load Balancer...
10月 18 02:01:59 DR systemd[1]: Started HAProxy Load Balancer.
10月 18 02:01:59 DR haproxy[106585]: [NOTICE]   (106585) : New worker #1 (106588) fo>
[root@DR ~]# ss -antl
State     Recv-Q     Send-Q          Local Address:Port         Peer Address:Port    
LISTEN    0          32              192.168.122.1:53                0.0.0.0:*       
LISTEN    0          128                   0.0.0.0:22                0.0.0.0:*       
LISTEN    0          5                   127.0.0.1:631               0.0.0.0:*       
LISTEN    0          128                   0.0.0.0:8189              0.0.0.0:*       
LISTEN    0          128                   0.0.0.0:111               0.0.0.0:*       
LISTEN    0          128                   0.0.0.0:80                0.0.0.0:*       
LISTEN    0          128                      [::]:22                   [::]:*       
LISTEN    0          5                       [::1]:631                  [::]:*       
LISTEN    0          128                      [::]:111                  [::]:*