Saturday, September 26, 2026
DevOps GitLab K3s

Belajar GitLab Part 2-Integrasi K3s

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image 3

Kali ini kita akan belajar Integrasi ke K3s, jadi berikut yang akan kita bahas

Berikut Topology yang di harapkan

    Macbook / Laptop -> Gitlab -> Server gitlab runner -> Ks3 ( untuk deploy)

    A.Integrasi laptop dengan Gitlab konek via ssh

      Sekarang tinggal memastikan local project kamu benar-benar sudah menjadi Git repository dan ada commit yang bisa di-push.

      Urutan lengkapnya seperti ini:

      cd existing_repo

      1. Inisialisasi Git (kalau belum)

      git init

      2. Tambahkan file project

      git add .

      3. Commit pertama

      git commit -m "first commit"

      Kalau muncul error identity unknown:

      git config --global user.name "Nama Kamu"
      git config --global user.email "[email protected]"

      Lalu commit ulang.

      4. Tambahkan remote GitLab

      git remote add origin https://gitlab.com/project7112620/belajar-gitlab.git

      Kalau sebelumnya sudah pernah add origin dan muncul:

      remote origin already exists

      gunakan:

      git remote remove origin

      lalu add lagi.

      5. Rename branch ke main

      git branch -M main

      6. Push ke GitLab

      git push -uf origin main

      Kalau Muncul Login Password Error

      GitLab sekarang biasanya tidak menerima password biasa untuk HTTPS.

      Solusi terbaik:

      • gunakan Personal Access Token
        ATAU
      • gunakan SSH key (lebih recommended)

      Cara Pakai SSH (Recommended)

      Generate SSH key

      ssh-keygen -t rsa -b 4096 -C "[email protected]"

      Tekan ENTER terus.

      Ambil public key

      cat ~/.ssh/id_rsa.pub

      Copy hasilnya.

      Tambahkan ke GitLab

      GitLab SSH Keys

      Klik:

      • Add new key
      • paste public key
      • save

      Ganti remote HTTPS jadi SSH

      Cek dulu:

      git remote -v

      Ganti:

      git remote set-url origin [email protected]:project7112620/belajar-gitlab.git

      Test SSH

      ssh -T [email protected]

      Kalau berhasil muncul:

      Welcome to GitLab ...

      Push lagi

      git push -uf origin main

      Setelah Berhasil

      Cek project GitLab kamu:

      GitLab Project Repository

      Kalau file sudah muncul berarti sukses 🎉

      B. Install Gitlab Runner

      Misalkan saya installkan gitlab runner di master K3s

      Agar pipeline jalan:

      • install GitLab Runner
      • runner harus punya Docker

      install docker

      sudo apt update
sudo apt install -y ca-certificates curl gnupg

sudo install -m 0755 -d /etc/apt/keyrings

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | \
sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

echo \
"deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] \
https://download.docker.com/linux/ubuntu \
$(. /etc/os-release && echo $VERSION_CODENAME) stable" | \
sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

      install gitlab runner

      curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.deb.sh | sudo bash

sudo apt install gitlab-runner -y

      Register Runner



      Di GitLab:

      • Settings
      • CI/CD
      • Runners
      • Create project runner
      • Copy token
      image 4
      image 5

      misal namanya -> main-runner

      Lalu:

      sudo gitlab-runner register

      Enter the GitLab instance URL:
https://gitlab.com/

Enter the registration token:
xxxxxx

Enter a description for the runner:
k3s-runner

Enter tags for the runner:
k3s,docker

Enter optional maintenance note:
(skip)

Enter an executor:
docker

Enter the default Docker image:
docker:latest

      Setelah Berhasil

      Cek runner:

      sudo gitlab-runner status

      C. Coba Build dari Gitlab ke K3s

      Ambil code dari -> https://github.com/kyuby13/belajar-gitlab

      yang wajib harus ada file .gitlab-ci.yml -> jangan lupa tags nya harus sama nama nya dengan nama runner di gitlab yang di langkah bagian B misalkan namanya main-runner

      deploy:
  image: alpine:latest

  tags:
    - main-runner

  stage: deploy

  before_script:
    - apk add --no-cache curl
    - 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: /etc/rancher/k3s/k3s.yaml

  script:
    - kubectl get nodes
    - kubectl apply -f deployment.yaml
    - kubectl apply -f service.yaml

      kurang lebih nanti isi file nya seperti berikut :

      image 6

      saya anggap nanti isi project gitlab anda sudah sama dengan gambar tersebut.

      D. Setting K3s dan Gitlab Runner

      setting k3s ( ubah IP dari localhost ke IP K3s)

      nano /etc/rancher/k3s/k3s.yaml

ubah bagian server: https://127.0.0.1:6443 
menjadi server: https://192.168.10.15:6443

      Setting Gitlab Runner

      nano /etc/gitlab-runner/config.toml

concurrent = 1
check_interval = 0
connection_max_age = "15m0s"
shutdown_timeout = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "master-runner"
  url = "https://gitlab.com"
  id = 53125612
  token = "glrt-T2W3hsya775bXIB7_TdsVmM6MQpvOjEKcDoxY3c0NXIKdDozCnU6OG94MnAc.01.1o0ngqaug"
  token_obtained_at = 2026-05-12T10:07:25Z
  token_expires_at = 0001-01-01T00:00:00Z
  executor = "docker"
  tag_list = ["k3s"]
  [runners.cache]
    MaxUploadedArchiveSize = 0
    [runners.cache.s3]
      AssumeRoleMaxConcurrency = 0
    [runners.cache.gcs]
    [runners.cache.azure]
  [runners.docker]
    tls_verify = false
    image = "docker:latest"
    privileged = true
    disable_entrypoint_overwrite = false
    oom_kill_disable = false
    disable_cache = false
    volumes = ["/cache", "/etc/rancher/k3s:/etc/rancher/k3s"]
    volume_keep = false
    shm_size = 0
    network_mtu = 0

      Note: tambahkan line tag_list = [“k3s”] , ubah line privileged = true dan volumes = [“/cache”, “/etc/rancher/k3s:/etc/rancher/k3s”]

      sudo systemctl restart gitlab-runner
sudo gitlab-runner verify
sudo systemctl status gitlab-runner
kubectl get node
kubectl get pods
kubectl get svc

      E. Coba trigger untuk Build

      Dari macbook/lapotp coba trigger

      git add .
git commit -m "first k3s deployment"
git push

atau cara triger pipline nya saja

git commit --allow-empty -m "rerun pipeline"
git push

      cek di gitlab, jika sukses berarti berhasil

      image 7

      cek pods di K3s , jika berhasil akan muncul pod baru

      root@kube1:~# kubectl get pods
NAME                                READY   STATUS        RESTARTS      AGE
nginx-app-6489b68c68-44f5b          1/1     Running       0             3h2m

      coba akses via web -> http://192.168.10.15:30080

      image 8

      Workflow kamu sekarang:

      MacBook
      ↓
      git push
      ↓
      GitLab Pipeline
      ↓
      Runner di kube1
      ↓
      kubectl apply
      ↓
      Deploy otomatis ke K3s

      Itu sudah real DevOps pipeline.

      Yang Sudah Berhasil

      ✅ GitLab Runner lokal
      ✅ Runner connect ke K3s
      ✅ Pipeline otomatis
      ✅ Auto deployment Kubernetes
      ✅ Service NodePort
      ✅ kubectl dari pipeline

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