haproxy负载均衡服务
★准备工作★
一共需要三台服务器
hapoxy服务器：192.168.31.101
nginx1服务器：192.168.31.102
nginx2服务器：192.168.31.103
两台nginx的网页内容为：
nginx1(192.168.31.102)：
[root@nginx1 ~]# cat /usr/share/nginx/html/index.html
<html>
<h2>Welcome to Hapoxy test!!!</h2>
this is wwww.aaa.com
</html>
nginx2(192.168.31.103)：
[root@nginx2 ~]# cat /usr/share/nginx/html/index.html
<html>
<h2>Welcome to Hapoxy test!!!</h2>
this is wwww.bbb.com
</html>
需要准备lua和hapoxy安装包
lua安装包：lua-5.3.5.tar.gz
hapoxy安装包：haproxy-2.3.2.tar.gz
安装配置haproxy
1.安装工具和依赖包
yum -y install gcc gcc-c++ glibc glibc-devel pcre pcre-devel openssl openssl-devel systemd-devel iotop bc zlib-devel lrzsz tree screen
yum -y install libevent-devel.x86_64 ncurses-devel.x86_64 readline-devel.x86_64 libtermcap-devel
2.安装lua
tar zxf lua-5.3.5.tar,gz
cd lua-5.3.5 && make linux test
查看lua版本
[root@hapoxy ~]# lua -v
Lua 5.3.5 Copyright (C) 1994-2018 Lua.org, PUC-Rio
3.编译安装haproxy
tar zxf haproxy-2.3.2.tar.gz
cd haproxy-2.3.2 && make TARGET=linux-glibc LUA_INC=/root/lua-5.3.5/src/ LUA_LIB=/root/lua-5.3.5/src/ PREFIX=/usr/local/haproxy && make install PREFIX=/usr/local/haproxy
4.优化脚本路径
ln -s /usr/local/haproxy/sbin/haproxy /usr/sbin/
5.创建haproxy工作目录
mkdir -p /var/lib/haproxy /etc/haproxy
6.创建编辑haproxy配置文件
vim /etc/haproxy/haproxy.cfg
---------------------------------------
global
maxconn 30000 #最大连接数
chroot /usr/local/haproxy #锁定工作目录（安全）
stats socket /var/lib/haproxy/haproxy.sock mode 600 level admin #sock文件
uid 188 #指定用户uid
gid 188 #指定用户gid
daemon #以守护进程方式运行
nbproc 2 #开启多进程工作模式，推荐使用多进程单线程，除非服务器只有1核CPU
pidfile /var/run/haproxy.pid
log 127.0.0.1 local3 info #日志收集，最多设置2个
spread-checks 5 #后端server状态检测提前或延迟（百分比）
defaults
option http-keep-alive #开启与客户端会话保持
option forwardfor #透传客户端真实IP到后端服务器
option redispatch #server id对应的服务器挂掉，强制定向到健康的服务器
maxconn 3000 #单进程最大连接数
mode http #工作类型
#retries 3 #3次连接失败就认为服务不可用，也可以通过后面设置
#balance roundrobin #默认的负载均衡的方式,轮询方式
timeout http-keep-alive 120s #session会话保持时间,范围内会转到相同后端服务器
timeout connect 1000ms #客户请求到后端server最长连接等待时间（TCP握手前）
timeout client 600ms #客户请求从到后端server的请求处理超时时长（TCP握手后）
timeout server 600ms #haproxy与客户端的最长非活动时间
timeout check 5s #对后端服务器的默认检测超时时间
listen status
mode http
bind 0.0.0.0:9999
stats enable
log global
#stats hide-version #隐藏统计页面dd上的HAproxy版本信息
stats uri /status
stats auth admin:admin
listen web_port
bind 0.0.0.0:80
mode http
log global
server web1 192.168.31.102:80 check inter 3000 fall 2 rise 5
server web2 192.168.31.103:80 check inter 3000 fall 2 rise 5
#间隔3s，失败次数2次确认失败，探测连续成功次数为5次确认为成功，共耗时15s
7.复制启动脚本加到systemctl
cp haproxy-2.3.2/examples/haproxy.init /etc/init.d/haproxy
chmod +x /etc/init.d/haproxy
8.启动haproxy服务
启动命令：/etc/init.d/haproxy restart
[root@hapoxy ~]# /etc/init.d/haproxy restart
Restarting haproxy (via systemctl): [ OK ]
[root@hapoxy ~]# systemctl status haproxy
● haproxy.service - SYSV: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments.
Loaded: loaded (/etc/rc.d/init.d/haproxy; bad; vendor preset: disabled)
Active: active (running) since Thu 2022-07-07 02:21:51 EDT; 5s ago
Docs: man:systemd-sysv-generator(8)
Process: 17301 ExecStart=/etc/rc.d/init.d/haproxy start (code=exited, status=0/SUCCESS)
Main PID: 17312 (haproxy)
CGroup: /system.slice/haproxy.service
├─17312 /usr/sbin/haproxy -D -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid
└─17313 /usr/sbin/haproxy -D -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid
Jul 07 02:21:51 hapoxy haproxy[17301]: Starting haproxy: [WARNING] 187/022151 (17310) : nbproc is deprecated!
Jul 07 02:21:51 hapoxy haproxy[17301]: | For suffering many limitations, the 'nbproc' directive is now deprecated
Jul 07 02:21:51 hapoxy haproxy[17301]: | and scheduled for removal in 2.5. Just comment it out: haproxy will use
Jul 07 02:21:51 hapoxy haproxy[17301]: | threads and will run on all allocated processors. You may also switch to
Jul 07 02:21:51 hapoxy haproxy[17301]: | 'nbthread 2' to keep the same number of processors. If you absolutely
Jul 07 02:21:51 hapoxy haproxy[17301]: | want to run in multi-process mode, you can silence this warning by adding
Jul 07 02:21:51 hapoxy haproxy[17301]: | 'nbthread 1', but then please report your use case to developers.
Jul 07 02:21:51 hapoxy haproxy[17301]: [WARNING] 187/022151 (17310) : Proxy 'status': in multi-process mode, stats will be limited to proces... request.
Jul 07 02:21:51 hapoxy haproxy[17301]: [ OK ]
Jul 07 02:21:51 hapoxy systemd[1]: Started SYSV: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments..
Hint: Some lines were ellipsized, use -l to show in full.
测试结果
1.通过访问192.168.31.101调用192.168.31.102和192.168.31.103的web页面（如下图）
发现刷新页面之后切换了网页，说明成功部署！！！
2.通过配置文件配置的网页查看调配的服务器健康情况
访问192.168.31.101:9999/status查看（如下图所示）
这里的网页后缀名以及用户名和密码看配置文件设置的stats选项
