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How do I fix and debug GitLab CI/CD pipelines?

GitLab CI/CD pipeline debugging and fixing can be a difficult process, but there are a number of steps you can take to help find and fix problems. You can adhere to the general procedures listed below:

1. Look for Syntax Errors​

The .gitlab-ci.yml file must first be checked for syntax mistakes. These mistakes may result in the pipeline failing even before it begins to operate. The GitLab CI/CD Linter tool can be used to verify for syntax mistakes. By selecting "CI Lint" in the top-right area of the screen under CI/CD > Pipelines in the GitLab web interface, users can access the Linter tool.

2. Review Pipeline Logs​

Checking the pipeline's logs is the next step if the .gitlab-ci.yml file's syntax is correct. You can determine where and why the pipeline is failing using the logs. By going to CI/CD > Pipelines and selecting the desired pipeline, you can view the logs in the GitLab web interface. On the right side of the screen, the logs will be visible.

3. Utilize Debugging Tools​

You can use debugging tools to get more information if the logs are insufficient for pinpointing the problem. The shell executor, which enables you to run the pipeline locally on the same machine as the GitLab Runner, is one of the debugging tools offered by the GitLab Runner.

4. Check the Environment Variables​

Make sure that environment variables are properly set if the problem is related to them. By going to Settings > CI/CD > Variables in the GitLab web interface, you can verify the environment variables.

5. Check for Pipeline Artifacts​

Verify the creation and storage of artifacts if the pipeline is producing them. By going to CI/CD > Pipelines and selecting the desired pipeline, you can examine the artifacts in the GitLab web interface. On the right side of the screen, the artifacts will be visible.

6. Check the Runner Configuration​

If none of the aforementioned fixes the problem, it might be a problem with the GitLab Runner itself. Make sure the runner is activated and configured properly. By going to Settings > CI/CD > Runners in the GitLab web interface, you can verify the status of the runner.

Summary​

In conclusion, a methodical strategy to locating and resolving issues is needed when debugging and troubleshooting GitLab CI/CD pipelines. You can resolve pipeline problems and make sure that your pipeline runs without a hitch by taking the preceding actions.