gitlab-ci-patterns

1# GitLab CI Patterns
2 
3Comprehensive GitLab CI/CD pipeline patterns for automated testing, building, and deployment.
4 
5## Purpose
6 
7Create efficient GitLab CI pipelines with proper stage organization, caching, and deployment strategies.
8 
9## When to Use
10 
11- Automate GitLab-based CI/CD
12- Implement multi-stage pipelines
13- Configure GitLab Runners
14- Deploy to Kubernetes from GitLab
15- Implement GitOps workflows
16 
17## Basic Pipeline Structure
18 
19```yaml
20stages:
21  - build
22  - test
23  - deploy
24 
25variables:
26  DOCKER_DRIVER: overlay2
27  DOCKER_TLS_CERTDIR: "/certs"
28 
29build:
30  stage: build
31  image: node:20
32  script:
33    - npm ci
34    - npm run build
35  artifacts:
36    paths:
37      - dist/
38    expire_in: 1 hour
39  cache:
40    key: ${CI_COMMIT_REF_SLUG}
41    paths:
42      - node_modules/
43 
44test:
45  stage: test
46  image: node:20
47  script:
48    - npm ci
49    - npm run lint
50    - npm test
51  coverage: '/Lines\s*:\s*(\d+\.\d+)%/'
52  artifacts:
53    reports:
54      coverage_report:
55        coverage_format: cobertura
56        path: coverage/cobertura-coverage.xml
57 
58deploy:
59  stage: deploy
60  image: bitnami/kubectl:1.31
61  script:
62    - kubectl apply -f k8s/
63    - kubectl rollout status deployment/my-app
64  only:
65    - main
66  environment:
67    name: production
68    url: https://app.example.com
69```
70 
71## Docker Build and Push
72 
73```yaml
74build-docker:
75  stage: build
76  image: docker:24
77  services:
78    - docker:24-dind
79  before_script:
80    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
81  script:
82…