HAProxy架设笔记

需求：简单的4层（SSH）和7层（HTTP)反向代理
架设环境：CentOS 8
安装

> sudo dnf install haproxy

配置

> sudo vim /etc/haproxy/haproxy.cfg

# 如下是关键修改部分
global
    ...
    maxconn   20480
    ulimit-n      65535
    ...

default
    ...
    stats uri    /haproxy?stats # 查看haproxy的状态，地址http://<haproxy_ip>/haproxy?stats
    ...

# 定义7层HTTP转发
frontend sdc
    bind *:80
    # define acl for different streamset data controller server
    acl sdc1-policy hdr_dom(host)    -i sdc1.3rd.pla95929
    acl sdc2-policy hdr_dom(host)    -i sdc2.3rd.pla95929
    # back end for acl
    use_backend server_sdc1    if sdc1-policy
    use_backend server_sdc2    if sdc2-policy
    # send X-Forwarded-For header
    option forwardfor    except 127.0.0.0/8

backend server_sdc1
    server srv sdc1:18630 check
backend server_sdc2
    server srv sdc2:18630 check
# sdc1和sdc2在haproxy的/etc/hosts有记录，也能够直接写ip，srv为自定义的名字

# 定义4层TCP转发
listen ssh-sdc1
    mode tcp
    option tcplog
    tcp-request inspect-delay 5s
    bind *:2201
    server node sdc1:22 check
listen ssh-sdc2
    mode tcp
    option tcplog
    tcp-request inspect-delay 5s
    bind *:2202
# 4层反代不能经过检查host来配置acl策略，只能使用端口绑定方式实现