Troubleshooting Stuck GitLab CI/CD Jobs

When working with GitLab CI/CD, you may encounter situations where your jobs get stuck, especially during Maven builds. This guide will help you identify potential issues and configure your .gitlab-ci.yml file correctly.

Common Causes for Stuck Jobs

1. Runner Configuration: Ensure that your GitLab Runner is properly registered and online. If the runner is not available, jobs will not execute.
2. Job Tags: If your runner is configured to run only tagged jobs, ensure that your jobs in the .gitlab-ci.yml file have the appropriate tags or configure the runner to accept untagged jobs.

Example .gitlab-ci.yml Configuration

Here’s a sample configuration that demonstrates how to set up a CI/CD pipeline for a Maven project:

image: docker:latest

services:
  - docker:dind

variables:
  DOCKER_DRIVER: overlay
  SPRING_PROFILES_ACTIVE: gitlab-ci

stages:
  - build
  - package
  - deploy

maven-build:
  image: maven:3-jdk-8
  stage: build
  script:
    - mvn package -B
  artifacts:
    paths:
      - target/*.jar

docker-build:
  stage: package
  script:
    - docker build -t registry.com/ci-cd-demo .
    - docker push registry.com/ci-cd-demo

k8s-deploy:
  image: google/cloud-sdk
  stage: deploy
  script:
    - echo "$GOOGLE_KEY" > key.json
    - gcloud container clusters get-credentials standard-cluster-demo --zone us-east1-c --project ascendant-study-222206
    - kubectl apply -f deployment.yml

Runner Settings

To check your runner settings:

• Navigate to your project’s Settings > CI/CD section.
• Expand the Runners section to ensure your runner is listed and enabled.
• If your runner is not picking up jobs, verify that the Run untagged jobs option is enabled for your runner.

Conclusion

By ensuring your runner is online and properly configured, and by using the correct tags in your jobs, you can resolve issues with stuck GitLab CI/CD jobs during Maven builds. If problems persist, check the runner logs for more detailed error messages.