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GitLab CI Troubleshooting Toolkit

GitLab CI Troubleshooting Toolkit

Debug stuck pipelines, offline runners, .gitlab-ci.yml syntax, missing variables, and deployment jobs with prompts and a CI validator.

Validate your pipeline Browse GitLab CI prompts

Top GitLab CI errors

Start with the most common production issues and troubleshooting paths.

Uploading artifacts ... 413 Request Entity Too Large

Fix GitLab CI's '413 Request Entity Too Large' when uploading artifacts: raise the instance max artifact size, trim paths, and…

Downloading artifacts ... invalid argument

Fix GitLab CI's 'Downloading artifacts ... invalid argument' during extraction: bad paths, illegal filenames, filesystem limits…

WARNING: Failed to create cache ... permission denied

Fix GitLab CI cache 'permission denied' errors: align container user UID with cache-dir ownership, fix volume permissions, and…

jobs:deploy:environment config should be a hash

Fix GitLab CI's 'jobs:deploy:environment config' validation errors: correct environment name/url/action/on_stop keys so the pip…

ERROR: Failed to remove network for build

Fix GitLab Runner's 'Failed to remove network for build' on the Docker executor: clear leaked per-build networks, endpoints, an…

image pull failed: ImagePullBackOff

Fix GitLab Kubernetes executor 'ImagePullBackOff / ErrImagePull': missing imagePullSecrets, wrong image names, private registry…

pull policy ... is not one of the allowed_pull_policies

Fix GitLab Runner's 'pull_policy not allowed' error: align job-level image pull_policy with the runner's allowed_pull_policies…

fatal: ref HEAD is not a symbolic ref

Fix GitLab CI's 'fatal: ref HEAD is not a symbolic ref' caused by detached-HEAD checkouts and shallow clones: read CI_COMMIT_*…

Best GitLab CI prompts

Use these prompts to turn symptoms, logs, and config into a structured troubleshooting plan.

GitLab CI/CD → Kubernetes Deploy Patterns

Design GitLab CI/CD pipelines that deploy to Kubernetes — kubectl vs Helm vs Kustomize, secrets handling, multi-environment promotion, GitOps comparison.

GitLab CI/CD Pipeline Optimization

Speed up slow GitLab pipelines — DAG with `needs:`, cache vs artifacts, parallel jobs, image pre-builds, dependency proxy, and shallow clones.

GitLab CI/CD before_script to extends Refactor

Refactor sprawling, duplicated before_script and inline shell across jobs into reusable hidden jobs, extends, and !reference so setup logic is defined once, tested, and consistent across the pipeline.

CircleCI to GitLab CI/CD Migration

Translate a CircleCI config.yml into an idiomatic .gitlab-ci.yml, mapping orbs, workflows, executors, contexts, and caching to GitLab equivalents while flagging concepts that don't port cleanly.
All GitLab CI prompts

Free GitLab CI tools

Validate, troubleshoot, or analyze your configuration before production changes.

GitLab CI validator

Check .gitlab-ci.yml for YAML errors, jobs with no script, undeclared stages, and rules conflicts.

Open validator

YAML validator

Line-accurate YAML checks for pipeline and job definitions.

Open validator

GitLab CI runbook

Use a repeatable checklist for production troubleshooting.

A repeatable checklist for pipelines that won’t run, pass, or deploy.

  1. 1 Validate .gitlab-ci.yml (syntax, stages, job scripts, rules)
  2. 2 Check runner status and tags (registered, online, matching)
  3. 3 Inspect CI/CD variables and masked secrets
  4. 4 Review the failing job logs and exit codes
  5. 5 Confirm artifact and cache paths, and DinD/service config
Get the runbook checklist