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Struggling to SSH into multiple GitLab runners on the same server? This guide explains how to configure your GitLab runners for distinct access and management.
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This video is based on the question https://stackoverflow.com/q/75473698/ asked by the user 'David G' ( https://stackoverflow.com/u/701092/ ) and on the answer https://stackoverflow.com/a/75478565/ provided by the user 'Reaz Murshed' ( https://stackoverflow.com/u/3145960/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to SSH into a Separate GitLab Instance's Runner Without Confusion

If you're a developer or an operations engineer working with multiple GitLab runners on a single server, you might find yourself facing an interesting challenge. You have two runners on your server, both named gitlab-runner. When you try to SSH into one of them, using the command sudo su - gitlab-runner, you always land on the first instance. So how can you gain access to the other GitLab runner? In this guide, we'll guide you through a clear and effective solution to this problem.

Understanding the Challenge

When you have multiple instances of GitLab runners on the same server, issues can arise when they share the same name. By default, the SSH command does not distinguish between them, and as a result, you might end up accessing the first runner, no matter which one you're attempting to connect to. The good news is that this is a common scenario that can be resolved with a simple configuration change.

Step-by-Step Solution

Step 1: Modify the Configuration File

The first step to successfully SSH into each GitLab runner instance is to modify the configuration of your runners. This involves changing the names in the /etc/gitlab-runner/config.toml file. Here’s how you can do this:

Open the terminal on your server.

Use a text editor (for example vi) to open the config.toml file by running the following command:

[[See Video to Reveal this Text or Code Snippet]]

Update the runner configurations by giving them unique names. Below is an example of what the updated configuration could look like:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Restart the GitLab Runner Service

After you’ve made the necessary changes to the configuration file, it’s important to restart the GitLab runner service for the changes to take effect. You can do this with the following command:

[[See Video to Reveal this Text or Code Snippet]]

Final Thoughts

With these changes in place, you will now be able to SSH into each of your GitLab runners independently. Instead of being directed to the first runner every time, you can simply target the runner you want to interact with based on its new name.

By managing the configuration of your runners effectively, you'll streamline your workflow and utilize both runners to their full potential. Don't forget to regularly review and manage your configurations to ensure optimal efficiency in your CI/CD processes.

Now, you're all set! Go ahead and give it a try—you'll be SSHing into your preferred GitLab runner instance without confusion in no time!