Important Files and Folders
| File/Folder | Purpose |
|---|---|
| /etc/squid3/squid.conf | Squid configuration file |
| /var/log/squid/access.log | Squid access log file (on Ubuntu) |
Configuration
Change the default configuration by editing /etc/squid3/squid.conf.
Configure the devices / subnet allowed access.
acl localnet src 192.168.1.0/24 http_access allow localnet
Find the http_port tag. By default it is set to port 3128. This is the port that Squid will listen to for requests. You will also need to set this port in your browser when you configure the browser's proxy.
Since our application is multi-homed, we need to specify that squid listens on only the green zone subnet:
http_port 192.168.1.1:3128
Running Squid
Once installed, Squid will run on boot. Squid can be restarted by:
$ sudo service squid3 restart
If you make changes to squid.conf or later reconfigure SquidGuard, you can run a reconfigure:
$ sudo squid -k reconfigure
You can view squid activity on an Ubuntu installation at /var/log/squid3/access.log. If configured for native format, each line will be written as shown below. Further information on the log format can be found here.
time elapsed remotehost code/status bytes method URL rfc931 peerstatus/peerhost type
