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我们曾经在介绍nginx的时候顺便使用nginx做过正向代理的设定,但是如果希望支持https的话,直接使用nginx则较为困难,而使用在这方面术业有专攻的squid则要简单的多。这篇文章用于记录在centos7上安装和设定squid3.5来实现http和https的步骤。

机器配置

[root@liumiaocn ~]# uname -a
Linux mail.163.com 3.10.0-514.el7.x86_64 #1 SMP Tue Nov 22 16:42:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
[root@liumiaocn ~]# 
[root@liumiaocn ~]# cat /etc/redhat-release 
CentOS Linux release 7.3.1611 (Core) 
[root@liumiaocn ~]#

安装squid

安装命令: yum install squid

确认版本

版本确认: rpm -qa |grep squid

[root@liumiaocn ~]# rpm -qa |grep squid
squid-migration-script-3.5.20-12.el7.x86_64
squid-3.5.20-12.el7.x86_64
[root@liumiaocn ~]# 

确认ip_forward

ip_forward需要设定为1,缺省centos已设定,详细如下:

[root@liumiaocn ~]# sysctl -a |grep -w ip_forward
net.ipv4.ip_forward = 1
[root@liumiaocn ~]# 

修改设定文件

修改前

[root@liumiaocn ~]# grep -n 'http_access deny all' /etc/squid/squid.conf
56:http_access deny all
[root@liumiaocn ~]#

修改后

[root@liumiaocn ~]# grep -n http /etc/squid/squid.conf |grep -w all
56:http_access allow all
[root@liumiaocn ~]#

启动squid

systemctl start squid

问题1:libssl错误

启动squid时提示如下错误

squid: relocation error: squid: symbol SSL_set_alpn_protos, version libssl.so.10 not defined in file libssl.so.10 with link time reference

原因:未安装openssl

对应方法: yum install openssl

安装之后启动squid即可:

[root@liumiaocn ~]# systemctl start squid
[root@liumiaocn ~]# systemctl status squid
● squid.service - Squid caching proxy
  Loaded: loaded (/usr/lib/systemd/system/squid.service; disabled; vendor preset: disabled)
  Active: active (running) since Tue 2018-06-05 20:07:56 CST; 8s ago
 Process: 28548 ExecStart=/usr/sbin/squid $SQUID_OPTS -f $SQUID_CONF (code=exited, status=0/SUCCESS)
 Process: 28540 ExecStartPre=/usr/libexec/squid/cache_swap.sh (code=exited, status=0/SUCCESS)
 Main PID: 28551 (squid)
  Memory: 14.3M
  CGroup: /system.slice/squid.service
      ├─28551 /usr/sbin/squid -f /etc/squid/squid.conf
      ├─28553 (squid-1) -f /etc/squid/squid.conf
      └─28557 (logfile-daemon) /var/log/squid/access.log
Jun 05 20:07:56 liumiaocn systemd[1]: Starting Squid caching proxy...
Jun 05 20:07:56 liumiaocn squid[28551]: Squid Parent: will start 1 kids
Jun 05 20:07:56 liumiaocn squid[28551]: Squid Parent: (squid-1) process 28553 started
Jun 05 20:07:56 liumiaocn systemd[1]: Started Squid caching proxy.
[root@liumiaocn ~]#

问题2:无法进行域名解析

此时发现无法使用域名只能使用ip来访问

原因:dns未配置,在squid的配置文件中添加8.8.8.8和8.8.4.4

[root@liumiaocn ~]# grep nameserver /etc/squid/squid.conf
dns_nameservers 8.8.8.8 8.8.4.4
[root@liumiaocn ~]# 
[root@liumiaocn ~]# systemctl restart squid
[root@liumiaocn ~]#

客户端的访问

squid的缺省port为3128,在这里没有修改,在客户端使用如下方式即可访问:

http方式

export http_proxy=http://192.168.163.117:3128
curl http://www.baidu.com

https方式

export https_proxy=http://192.168.163.117:3128
curl https://www.baidu.com

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,谢谢大家对的支持。如果你想了解更多相关内容请查看下面相关链接

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