How to use squid to build a proxy server for http and https
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When we introduced nginx, we also used nginx to set up a forward proxy. However, if you want to support https, it is difficult to use nginx directly. It is much simpler to use squid, which specializes in this area. This article is used to record the steps to install and configure squid3.5 on centos7 to implement http and https. Machine Configuration [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 ~]# Install Squid
Confirm version
[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 ~]# Confirm ip_forward ip_forward needs to be set to 1, which is already set by default in centos. The details are as follows: [root@liumiaocn ~]# sysctl -a |grep -w ip_forward net.ipv4.ip_forward = 1 [root@liumiaocn ~]# Modify the settings file Before modification [root@liumiaocn ~]# grep -n 'http_access deny all' /etc/squid/squid.conf 56:http_access deny all [root@liumiaocn ~]# After [root@liumiaocn ~]# grep -n http /etc/squid/squid.conf |grep -w all 56:http_access allow all [root@liumiaocn ~]# Start Squid
Problem 1: libssl error The following error is prompted when starting squid Reason: openssl is not installed
[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 ~]#Problem 2: Unable to resolve domain name At this time, it is found that the domain name cannot be used and only the IP address can be used to access
[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 ~]# Client access The default port of Squid is 3128, which is not modified here. You can access it from the client using the following method: HTTP method
HTTPS method
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