I'm running a Gitlab CI runner on AWS EC2. I need to know which ports are required to be open so that I would not need to allow all incoming traffic to the server.
Currently, I have allowed all incoming traffic which is a security concern and when I change it to only SSH then the runner does not work. Which ports are required to be open for this purpose?
The runner does not require any inbound connections. The runner can operate with outbound/established connections only.
If your firewall also controls outbound/established connections, you'll need to make sure you allow outbound and established connections to your GitLab server. Usually just 22 for SSH and 80/443 HTTP/HTTPS, but this can change depending on your server configuration.
