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| ==============================================================================================
环境
准备三台主机
haproxy：外网地址：192.168.1.25；内网地址：172.16.106.143
httpd1：内网地址：172.16.106.145
httpd2：内网地址：172.16.106.144
==============================================================================================
---------------
httpd1&2
---------------
[root@httpd1 ~]# yum install -y httpd
[root@httpd1 ~]# systemctl start chronyd
[root@httpd1 ~]# systemctl enable chronyd
[root@httpd1 ~]# chronyc
chrony version 3.1
Copyright (C) 1997-2003, 2007, 2009-2017 Richard P. Curnow and others
chrony comes with ABSOLUTELY NO WARRANTY. This is free software, and
you are welcome to redistribute it under certain conditions. See the
GNU General Public License version 2 for details.
chronyc> waitsync
try: 1, refid: 771CCEC1, correction: 0.000001078, skew: 32.010
# 同步时间
[root@httpd1 ~]# vim /var/www/html/index.html
Backend Server 1
# 给两台服务器提供一个主面，另一台服务器的内容是Backend Server 2
[root@httpd1 ~]# systemctl start httpd
[root@httpd2 ~]# curl 172.16.106.144
Backend Server 2
[root@httpd2 ~]# curl 172.16.106.145
Backend Server 1
--------------
haproxy
--------------
[root@haproxy haproxy]# vim /etc/rsyslog.conf
$ModLoad imudp
$UDPServerRun 514
local2.* /var/log/haproxy.log
# 加入此行，设置haproxy的日志路径
[root@haproxy haproxy]# systemctl restart rsyslog
[root@haproxy ~]# cd /etc/haproxy/
[root@haproxy haproxy]# cp haproxy.cfg{,.bak}
[root@haproxy haproxy]# vim haproxy.cfg
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
stats socket /var/lib/haproxy/stats
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
frontend myweb # 定义前端主机，取名叫myweb
bind *:80 # 定义haproxy的监听端口
default_backend websrvs # 定义默认使用的后端主机是websrvs
backend websrvs # 定义后端主机组叫websrvs
balance roundrobin # 使用轮询的方式
server srv1 172.16.106.145:80 check
server srv2 172.16.106.144:80 check
# 后端主机信息，使用server定义，srv1是haproxy内部引用的ID号，自定义的。它是服务器在haproxy上的内部名称；出现在日志及警告信息；check是对主机的健康检测，如果不加，那么会被认为是始终在线的。这是四层检测，发TCP请求，如果响应就表示在线
[root@haproxy haproxy]# systemctl start haproxy
[root@haproxy haproxy]# for i in `seq 10`;do curl 192.168.1.25;done
Backend Server 1
Backend Server 2
|