How to Configure a Squid Proxy to Listen on Multiple Ports
II. How to Change the Default Listening Port for a Squid Proxy
III. How to Configure a Squid Proxy to Listen on Multiple Ports
Squid is a caching and forwarding web proxy. It is most often used in conjunction with a traditional LAMP stack (Linux, Apache, MySQL, PHP), and can be used to filter traffic on HTTP, FTP, and HTTPS, and increase the speed (thus lower the response time) for a web server via caching.
- These instructions are intended specifically for configuring a Squid Proxy to listen on multiple ports.
- In this case I’ll be working from a Liquid Web Core Managed CentOS 7 server, and I’ll be logged in as root.
By default, Squid launches a session listening on port 3128.
Running the command:
netstat -plant
Should show something similar to:
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp6 0 0 :::3128 :::* LISTEN 6261/(squid-1)
Where :::3128 is the port on which Squid is listening.
Configuration file locations may vary. The config file should be called squid.conf. To find the config file use the following command:
locate squid.conf
You should receive a result similar to:
/etc/squid/squid.conf
For a refresher on editing files with vim see: New User Tutorial: Overview of the Vim Text Editor
Now, let’s edit the file found in the previous step:
vim /etc/squid/squid.conf
Look for a section of the configuration file similar to:
# Squid normally listens to port 3128
http_port 3128
Each port number on which you’d like Squid to listen requires a separate line in the config file.
For example: to use port 1337 and 1338 edit the file to include:
http_port 1337
http_port 1338
Exit and save the file, and then restart Squid:
systemctl restart squid
Now running the command:
netstat -plant
Should show something similar to:
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp6 0 0 :::1337 :::* LISTEN 6261/(squid-1)
tcp6 0 0 :::1338 :::* LISTEN 6261/(squid-1)
Where :::1337 and :::1338 are the ports on which Squid is listening.
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