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GitLab CI Failures

This page focuses on GitLab-specific CI troubleshooting: runner environments, artifacts, and reproducing pipeline failures.

What is a GitLab CI failure​

A failure occurs when a pipeline job exits non-zero. Common categories include test failures, script errors, and runner-level system failures.

Why this problem happens​

  • Misconfigured runners or images
  • Missing artifacts or registry permission problems
  • Intermittent network issues during pipeline runs

How engineers debug this​

  1. Collect the job logs and detect whether the failure is deterministic.
  2. Capture the runner image and environment variables used for the job.
  3. Reproduce the failing step locally with the same container.

Best practices​

  • Standardize runner images and pin versions to reduce environmental drift.
  • Centralize artifacts and tag them with commit SHAs.

Tools that help​

OctoLaunch helps by linking failing GitLab jobs to artifacts and deployments so engineers can follow a timeline from CI failure to possible deploy impact.

FAQ​

  • Q: How do I tell if a runner issue caused the failure?
    • A: Look for system-level errors in the job logs and compare failures across runs that used the same runner.
  • Q: What artifacts should I collect?
    • A: Test reports, trimmed logs, and the produced build artifact id.

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