Installing and Configuring Squid

1.5 hours
  • 5 Learning Objectives

About this Hands-on Lab

In this learning activity, you will need to install and configure squid so that it only permits web access to *linuxacademy.com*.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Install Squid

You will need to install Squid on Server1 (10.0.1.10):

yum install squid

Enable and Start Squid

You will need to enable Squid:

systemctl enable squid

And start it:

systemctl start squid

Permit Squid Client Access through the Firewall

You will need to permit clients to connect to the Squid service through the firewall:

firewall-cmd --permanent --add-service=squid

And reload the firewall configuration to pick up the change:

firewall-cmd --reload

Configure Squid

You’ll want to create an ACL that only allows clients to access linuxacademy.com. These go in /etc/squid/squid.conf after the line that says # INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS.

...
# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS

acl whitelist dstdomain .linuxacademy.com
http_access allow whitelist
...

You’ll also need to comment out or remove the line:

#http_access allow localnet

And restart Squid:

systemctl restart squid

Test from a Client

You’ll need to export the http_proxy value to use Server1:

export http_proxy="http://10.0.1.10:3128"

And try curling the header of linuxacademy.com:

curl -I linuxacademy.com

This should work. Verify this is the only site that works by curling a different address:

curl -I apache.org

This should come back as forbidden.

Additional Resources

A business unit needs you to provide a solution to their problem. They want to limit (non-SSL) web access for some client hosts to just linuxacademy.com. You will need to provide a proxy server for them to use.

You'll do this by installing a Squid proxy server, and configuring it so that it only permits traffic to linuxacademy.com. You won't need to restrict SSL traffic.

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Psst…this one if you’ve been moved to ACG!