1 前言

一个问题，一篇文章，一出故事。
笔者整理本文的原因是遇到Squid遇到需要在同一台服务器启动两个以上的Squid实例的情况，两个实例使用不同的端口同时对外提供服务。
本章基于你已经有以下基础配置实现，

如何yum部署Squid?

2 最佳实践

2.1 准备实例的配置文件以及服务控制脚本

cp /etc/squid/squid.conf /etc/squid/squid-dg.conf
cp /etc/squid/squid.conf /etc/squid/squid-hk.conf
cp /lib/systemd/system/squid.service /lib/systemd/system/squid-dg.service
cp /lib/systemd/system/squid.service /lib/systemd/system/squid-hk.service

2.2 修改实例配置

vim /etc/squid/squid-dg.conf

以上命令使用VIM编辑DG节点实例，增加如下配置，

http_port 3129
pid_filename /run/squid-dg.pid
access_log /var/log/squid/access-dg.log
cache_log /var/log/squid/cache-dg.log

以下使用VIM命令编辑HK节点实例，

vim /etc/squid/squid-hk.conf

增加如下配置，

http_port 3130
pid_filename /run/squid-hk.pid
access_log /var/log/squid/access-hk.log
cache_log /var/log/squid/cache-hk.log

2.3 修改实例服务控制脚本

vim /lib/systemd/system/squid-dg.service

以上命令使用VIM编辑DG节点实例，增加如下配置，

## Copyright (C) 1996-2022 The Squid Software Foundation and contributors
##
## Squid software is distributed under GPLv2+ license and includes
## contributions from numerous individuals and organizations.
## Please see the COPYING and CONTRIBUTORS files for details.
##

[Unit]
Description=Squid Web Proxy Server
Documentation=man:squid(8)
After=network.target network-online.target nss-lookup.target

[Service]
Type=notify
PIDFile=/run/squid-dg.pid
Group=proxy
RuntimeDirectory=squid
RuntimeDirectoryMode=0775
ExecStartPre=/usr/sbin/squid --foreground -z
ExecStart=/usr/sbin/squid --foreground -sYC -f /etc/squid/squid-dg.conf
ExecReload=/bin/kill -HUP $MAINPID
KillMode=mixed
NotifyAccess=all

[Install]
WantedBy=multi-user.target

以下使用VIM命令编辑HK节点实例，

vim /lib/systemd/system/squid-hk.service

增加如下配置，

## Copyright (C) 1996-2022 The Squid Software Foundation and contributors
##
## Squid software is distributed under GPLv2+ license and includes
## contributions from numerous individuals and organizations.
## Please see the COPYING and CONTRIBUTORS files for details.
##

[Unit]
Description=Squid Web Proxy Server
Documentation=man:squid(8)
After=network.target network-online.target nss-lookup.target

[Service]
Type=notify
PIDFile=/run/squid-hk.pid
Group=proxy
RuntimeDirectory=squid
RuntimeDirectoryMode=0775
ExecStartPre=/usr/sbin/squid --foreground -z
ExecStart=/usr/sbin/squid --foreground -sYC -f /etc/squid/squid-hk.conf
ExecReload=/bin/kill -HUP $MAINPID
KillMode=mixed
NotifyAccess=all

[Install]
WantedBy=multi-user.target

2.4 重载服务使配置生效

systemctl daemon-reload

2.5 启动服务并配置服务自启动

systemctl start squid-dg squid-hk
systemctl status squid-dg squid-hk
systemctl enable squid-dg squid-hk

2.6 测试实例

export proxy='http://127.0.0.1:3129'
export http_proxy="$proxy"
export https_proxy="$proxy"
export ftp_proxy="$proxy"
export no_proxy="cmdschool.org localhost, 127.0.0.1, ::1"
curl https://www.baidu.com

以上通过Shell设置代理指向DG实例然后使用CURL命令测试，以下命令用于测试HK实例，

export proxy='http://127.0.0.1:3130'
export http_proxy="$proxy"
export https_proxy="$proxy"
export ftp_proxy="$proxy"
export no_proxy="cmdschool.org localhost, 127.0.0.1, ::1"
curl https://www.baidu.com

参阅文档
===================
https://blog.csdn.net/robinspada/article/details/124163818