How To Install and Configure SQUID - Part 1

To Install SQUID

Run the following command to install Squid.

[root@linuxhelp user1]# yum install squid
Resolving Dependencies
-->  Running transaction check
--->  Package squid.x86_64 7:3.1.23-16.el6_8.4 will be installed
-->  Finished Dependency Resolution
Dependencies Resolved
===================================================================================== Package                          Arch                              Version                                         Repository                          Size
=====================================================================================
Installing:
 squid                            x86_64                            7:3.1.23-16.el6_8.4                             updates                            1.8 M
Transaction Summary
=====================================================================================
Install       1 Package(s)
Total download size: 1.8 M
Installed size: 6.3 M
Is this ok [y/N]: y
Downloading Packages:
squid-3.1.23-16.el6_8.4.x86_64.rpm                                                                                                    | 1.8 MB     00:07     
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : 7:squid-3.1.23-16.el6_8.4.x86_64                                                                                                          1/1 
  Verifying  : 7:squid-3.1.23-16.el6_8.4.x86_64                                                                                                          1/1 
Installed:
  squid.x86_64 7:3.1.23-16.el6_8.4        

After installation, start the services.

[root@linuxhelp user1]# service squid start
Starting squid: .                                          [  OK  ]

To Configure SQUID

Open the squid.conf file located in /etc/squid/

[root@linuxhelp user1]# vim /etc/squid/squid.conf

Go to line No 49 and add your own rules to access.

Rules are always compiled using First come First serve method.

First create a text file with a list of domains that you want to block (or) allow. Here, we are going to block the following domains - Twitter and Facebook.

[root@linuxhelp user1]# vim /etc/squid/block.txt

Now open the configuration file.

[root@linuxhelp user1]# vim /etc/squid/squid.conf

Add the acl rule to block the respective domains.

acl test src 192.168.7.152    
acl block dstdomain " /etc/squid/block.txt" 
http_access deny test block
http_access allow test

Explaination

1st line - Enter the source acl name as “ test” and entered the IP address/ network address (Ex : 192.168.7.0/24).
2nd line - Enter the acl name as “ block” and the path of the domain list file (/etc/squid/block.txt)
3rd line - Enter the “ deny” option along with acl name test and block. The domains mentioned in the file will be denied for the IP’ s in “ test” .
4th line - Enter “ allow test “ , to access all the other domains except the list in the file.

Save the file after entering the rule and reload the service.

[root@linuxhelp user1]# service squid reload

Open the browser and navigate to Options &rarr preferences &rarr Advanced &rarr Network tab &rarr Settings.

Select Manual proxy configuration. Enter the IP and port number of Squid server. Select use this proxy server for all protocols and click OK