4台Rocky 8.4
10.0.0.101,10.0.0.102,10.0.0.103  - Apache
10.0.0.104 -  Haproxy

=============================================
haproxy主配置global, default
[21:10:45 root@localhost ~]#vim /etc/haproxy/haproxy.cfg 

global
    log         127.0.0.1 local2 info

    chroot      /apps/haproxy
    pidfile     /var/lib/haproxy/haproxy.pid
    maxconn     100000
    user        haproxy
    group       haproxy
    daemon
    cpu-map auto:1/1-2 0-1
    maxsslconn 10
    maxconnrate 10
    spread-checks 2

    stats socket /var/lib/haproxy/haproxy.sock mode 600 level admin


defaults
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8 header X-Forwarded-For
    option                  redispatch
    option http-keep-alive
    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
============
Haproxy其他配置
listen stats
    mode http
    bind 0.0.0.0:9999
    stats enable
    log global
    stats uri /haproxy-status
    stats auth haadmin:123456

#listen web_port
#    mode http
#    bind 0.0.0.0:80
#    log global
#    server web1 10.0.0.103:80 check inter 3000 fall 2 rise 5 
#    server web2 10.0.0.102:80 check inter 3000 fall 2 rise 5 


frontend main
    bind 0.0.0.0:80
    mode http
#    balance roundrobin
    log global
    option httplog

   # acl url_static       path_beg       -i /static /images /javascript /stylesheets
   # acl url_static       path_end       -i .jpg .gif .png .css .js

  #  use_backend static          if url_static
    acl url_static       path_beg       -i /text

    use_backend web2 if url_static

    default_backend             web_servers

backend web_servers
#    balance roundrobin
    mode http
    default-server inter 1000 weight 6

    server web1 10.0.0.102:80 weight 2 check inter 3000 fall 2 rise 5
    server web2 10.0.0.103:80 weight 1 check inter 3000 fall 2 rise 5

backend web2
    mode http
    server web3 10.0.0.101:80 check inter 3000 fall 2 rise 5
~                                                                                                                                                               
~                                 

============
service文件

[21:21:16 root@localhost ~]#cat /lib/systemd/system/haproxy.service 
[Unit]
Description=HAProxy Load Balancer
After=network-online.target
Wants=network-online.target

[Service]
ExecStartPre=/usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -f /etc/haproxy/conf.d/ -c -q
ExecStart=/usr/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg -f /etc/haproxy/conf.d/ -p /var/lib/haproxy/haproxy.pid 
ExecReload=/bin/kill -USR2 
SuccessExitStatus=143
KillMode=mixed
Type=notify
LimitNOFILE=100000

[Install]
WantedBy=multi-user.target
                                   

=====================

# 权重分配，2：1访问

[21:18:28 root@localhost ~]#curl 10.0.0.104
10.0.0.102 test server
[21:18:31 root@localhost ~]#curl 10.0.0.104
10.0.0.102 test server
[21:18:31 root@localhost ~]#curl 10.0.0.104
10.0.0.103 test server

### acl 调用和IP透传

[21:19:23 root@localhost ~]#curl http://10.0.0.104/text/index.html
10.0.0.101 test2 server

[21:13:14 root@localhost ~]#tail -f /var/log/httpd/access_log 
10.0.0.104 - - [04/Oct/2021:21:09:49 +0800] "GET / HTTP/1.1" 200 23 "-" "curl/7.61.1"
10.0.0.104 - - [04/Oct/2021:21:09:53 +0800] "HEAD / HTTP/1.1" 200 - "-" "curl/7.61.1"
10.0.0.104 - - [04/Oct/2021:21:09:54 +0800] "HEAD / HTTP/1.1" 200 - "-" "curl/7.61.1"
10.0.0.104 - - [04/Oct/2021:21:09:55 +0800] "HEAD / HTTP/1.1" 200 - "-" "curl/7.61.1"
10.0.0.104 - - [04/Oct/2021:21:11:04 +0800] "HEAD / HTTP/1.1" 200 - "-" "curl/7.61.1"
10.0.0.104 - - [04/Oct/2021:21:11:05 +0800] "HEAD / HTTP/1.1" 200 - "-" "curl/7.61.1"
10.0.0.104 - - [04/Oct/2021:21:11:06 +0800] "HEAD / HTTP/1.1" 200 - "-" "curl/7.61.1"
10.0.0.104 - - [04/Oct/2021:21:12:29 +0800] "HEAD / HTTP/1.1" 200 - "-" "curl/7.61.1" "10.0.0.101" 
10.0.0.104 - - [04/Oct/2021:21:12:34 +0800] "GET / HTTP/1.1" 200 23 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36" "10.0.0.1" 
10.0.0.104 - - [04/Oct/2021:21:12:35 +0800] "GET / HTTP/1.1" 304 - "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36" "10.0.0.1" 




10.0.0.104 - - [04/Oct/2021:21:13:41 +0800] "HEAD / HTTP/1.1" 200 - "-" "curl/7.61.1" "10.0.0.101" 
10.0.0.104 - - [04/Oct/2021:21:13:41 +0800] "HEAD / HTTP/1.1" 200 - "-" "curl/7.61.1" "10.0.0.101"