Thursday, June 11, 2026
DevOps GitLab K3s Kubernetes

Belajar GitLab Part 4-Versioning & Roleback

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Target Flow Baru

Git Push
↓
Build image dengan tag commit
↓
Push registry
↓
Deploy image versi tertentu
↓
Bisa rollback kapan saja

STEP 1 — Update .gitlab-ci.yml

Gunakan:

stages:
  - build
  - deploy

variables:
  IMAGE_NAME: registry.gitlab.com/project7112620/belajar-gitlab/nginx-app
  IMAGE_TAG: $CI_COMMIT_SHORT_SHA

build:
  image: docker:latest

  tags:
    - main-runner

  stage: build

  services:
    - docker:dind

  variables:
    DOCKER_HOST: tcp://docker:2375
    DOCKER_TLS_CERTDIR: ""

  script:
    - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN registry.gitlab.com

    - docker build -t $IMAGE_NAME:$IMAGE_TAG .

    - docker push $IMAGE_NAME:$IMAGE_TAG

deploy:
  image: alpine:latest

  tags:
    - main-runner

  stage: deploy

  before_script:
    - apk add --no-cache curl sed
    - curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
    - chmod +x kubectl
    - mv kubectl /usr/local/bin/

  variables:
    KUBECONFIG: /kubeconfig

  script:
    - sed -i "s|IMAGE_TAG|$IMAGE_TAG|g" deployment.yaml
    - kubectl apply -f deployment.yaml

STEP 2 — Update deployment.yaml

Jangan hardcode latest.

Gunakan placeholder:

apiVersion: apps/v1
kind: Deployment

metadata:
  name: nginx-app

spec:
  replicas: 1

  selector:
    matchLabels:
      app: nginx-app

  template:
    metadata:
      labels:
        app: nginx-app

    spec:

      imagePullSecrets:
        - name: gitlab-registry

      containers:
      - name: nginx-app

        image: registry.gitlab.com/project7112620/belajar-gitlab/nginx-app:IMAGE_TAG

        imagePullPolicy: Always

        ports:
        - containerPort: 80

Bisa ambil code dari -> https://github.com/kyuby13/belajar-gitlab-versioning

Yang Akan Terjadi

Misal commit:

a1b2c3d

pipeline otomatis build:

registry.gitlab.com/project7112620/belajar-gitlab/nginx-app:a1b2c3d

Dan Deploy

Deployment otomatis menjadi:

image: registry.gitlab.com/project7112620/belajar-gitlab/nginx-app:a1b2c3d

STEP 3 — Push

git add .
git commit -m "add version tagging"
git push

STEP 4 — Cek Registry

Di GitLab Container Registry nanti akan muncul banyak versi:

a1b2c3d
f9e8d7c
91ab234

Cara Rollback

SUPER MUDAH 🔥

OPTION 1 — Kubernetes Rollback

Lihat history:

kubectl rollout history deployment nginx-app

Rollback:

kubectl rollout undo deployment nginx-app

atau ke revisi tertentu:

kubectl rollout undo deployment nginx-app --to-revision=2

OPTION 2 — Deploy Image Lama

Manual:

kubectl set image deployment/nginx-app \
nginx-app=registry.gitlab.com/project7112620/belajar-gitlab/nginx-app:a1b2c3d

Cara Cek Versi Yang Sedang Running

kubectl describe deployment nginx-app

atau:

kubectl get deployment nginx-app -o yaml

Kenapa Ini Penting?

Karena production real-world:

  • deploy bisa gagal
  • bug bisa muncul
  • harus rollback cepat

Makanya versioned image itu standard DevOps modern.

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