* Login as root.
* Move to squid.conf file,
cd /etc/squid/
vim squid.conf
* Add the following commmand in acl(access control list),
acl aclname dstdomain .sitename(for eg, xyzjdfhkjs.com)
* Then add the condition under the line "INSERT YOUR OWN RULE(S) HERE",
http_access deny aclname
For eg,
acl block-site dstdomain fghsdfkj.com
http_access deny block-site
* Finally restart squid,
/etc/init.d/squid restart
