You can block websites using squid proxy with 3 easy steps. First you have to create a text file with blocked domain name list such as orkut.com, gmail.com, sex.com, yahoo.com and so on. Second define and Access Control List (ACL). Third and final step Restart Squid.

First, create a file called /etc/squid/blocked.domains.acl (any file name you can use)
# cd /etc/squid
# vi blocked.domains.acl

add domain names in the file ,

eg:
orkut.com
gmail.com
sex.com
yahoo.com

Save and close the file.

Open /etc/squid/squid.conf file:

# vi /etc/squid/squid.conf

Create acl called blockeddomain

acl blockeddomain dstdomain "/etc/squid/blocked.domains.acl"

Deny http access, enter

http_access deny blockeddomain

Close and save the file. Restart squid proxy server

# /etc/init.d/squid restart

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