Installing and Configuring Squid

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

yum install squid

You will need to enable Squid:

systemctl enable squid

And start it:

systemctl start squid

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

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

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.