Squid is a proxy provider service. By installing it on your server, you can start providing and selling Proxy Servers (http/https) to your clients.
The installation procedure is quite simple.
First of all you should install EPEL repositories with this command:
Then you should install Squid repositories with this command:
Then you should install it with this command:
Finally you should start it with below commands:
systemctl enable squid
To configure Squid proxy service you can edit this file:
and when you do any change, you should restart Squid with this command:
If you have any questions, ask in Comments.