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Learn how to eliminate detached pipelines in GitLab by using `workflow:rules` to streamline your CI/CD process.
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How to Stop Detached Pipelines from Being Created in GitLab

In the world of continuous integration and deployment (CI/CD) using GitLab, developers often face challenges with unexpected pipeline behavior. One common issue is the creation of detached pipelines, which can clutter your project and make it difficult to track your work effectively. If you've ever noticed these unwanted pipelines popping up, you're not alone. In this guide, we'll explore how to prevent them from being created and ensure your pipelines are running as intended.

Understanding the Problem

You may have recently changed a job configuration in GitLab to utilize rules for controlling when certain jobs run. Here's the typical scenario:

Original Configuration: Your job was defined using only and except keywords, which dictated when it would execute.

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Updated Configuration: You switched to using rules for more flexibility, like this:

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After making this change, you noticed that every time you push a commit to your branch, two pipelines would trigger: one for your latest commit and another that appeared detached.

What is a Detached Pipeline?

In GitLab, detached pipelines, often associated with merge request events, can occur under certain conditions. In your case, the detached pipeline is triggered with CI_PIPELINE_SOURCE set to merge_request_event, whereas the standard pipeline has a CI_PIPELINE_SOURCE of push. Cancelling one pipeline unexpectedly cancels the other, leading to confusion.

How to Eliminate Detached Pipelines

To address and eliminate these undesired detached pipelines, you can use the workflow: rules feature within your GitLab CI configuration. Here's how to set it up.

Steps to Prevent Detached Pipelines

Utilize workflow: rules: This configuration allows you granular control over when pipelines are triggered. You can specify conditions under which merge request pipelines should or should not run.

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Example Configuration

Here’s an example of how to implement the above rules within your .gitlab-ci.yml file:

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Explanation of the Configuration

Preventing Merge Request Pipelines: The first rule states that if the pipeline source is a merge request event, it should never create a pipeline.

Allowing Other Pipelines: The second rule allows all other types of pipelines to execute as normal, ensuring that your commits and changes still trigger the necessary build processes.

Conclusion

By implementing workflow: rules into your GitLab CI configuration, you can cleanly manage and eliminate the creation of unwanted detached pipelines. This will not only streamline your development process but also enhance visibility and control over your CI/CD pipeline activities. If you continue to experience issues, double-check your conditions and ensure that your project settings align with your intended workflow.

For further assistance, feel free to reach out with any questions or brainstorming ideas on CI/CD configurations in GitLab!