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README.md
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README.md
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# CI/CD Strategie: Gitea Actions & ArgoCD
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Diese Strategie trennt den **Build-Prozess** (CI) strikt vom **Deployment-Prozess** (CD).
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## Der Workflow
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1. **Code Change (CI):**
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* Du pushst Code in ein App-Repo (z.B. `stabify/whoami`).
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* **Gitea Actions** springt an.
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* Der Code wird getestet und ein Docker Image gebaut.
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* Das Image wird in die Container Registry gepusht (z.B. `harbor.stabify.de/library/whoami:v1.0.1`).
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2. **Config Change (GitOps):**
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* Um das neue Image zu deployen, änderst du den Tag im **GitOps Repo** (`stabify/gitops`).
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* Datei: `apps/whoami/overlays/production/kustomization.yaml` -> `newTag: v1.0.1`.
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* Du commitest und pushst diese Änderung.
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3. **Deployment (CD):**
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* **ArgoCD** (läuft im Cluster) bemerkt den neuen Commit im GitOps Repo.
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* ArgoCD vergleicht IST-Zustand (Cluster) mit SOLL-Zustand (Git).
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* ArgoCD führt das Update durch (Rolling Update).
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---
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## Repository Struktur (Simuliert in diesem Ordner)
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### 1. `repo-app-source`
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Hier liegt der Quellcode deiner Anwendung.
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* Enthält den Source Code (Go, Node, Python...).
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* Enthält das `Dockerfile`.
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* Enthält die `.gitea/workflows/ci.yaml` Pipeline Definition.
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### 2. `repo-gitops`
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Hier liegt der Zustand deines Clusters.
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* **`bootstrap/`**: Der Einstiegspunkt für ArgoCD ("App of Apps").
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* **`cluster/production/`**: Definiert, WELCHE Apps auf dem Produktions-Cluster laufen sollen.
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* **`apps/`**: Enthält die eigentlichen K8s Manifeste (Deployments, Services, Ingress).
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* Wir nutzen **Kustomize** (Base/Overlay Struktur).
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* **Base**: Allgemeine Definition der App.
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* **Overlay**: Umgebungsspezifische Anpassungen (z.B. Hostnames, Replicas, Image Tags für Prod).
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## Vorteile dieser Struktur
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* **Sicherheit:** CI Server braucht keinen Cluster-Zugriff.
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* **Übersicht:** Das GitOps Repo ist die "Single Source of Truth".
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* **Wiederherstellbarkeit:** Cluster kaputt? Einfach ArgoCD installieren, auf das Repo zeigen, warten -> Fertig.
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repo-app-source/.gitea/workflows/docker-build.yaml
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repo-app-source/.gitea/workflows/docker-build.yaml
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name: Build and Push Docker Image
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run-name: ${{ gitea.actor }} is building Docker Image 🚀
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on:
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push:
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branches:
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- main
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tags:
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- 'v*'
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jobs:
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build-push:
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runs-on: ubuntu-latest
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steps:
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- name: Check out repository code
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uses: actions/checkout@v3
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- name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v2
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- name: Login to Docker Registry
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uses: docker/login-action@v2
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with:
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registry: ghcr.io # Oder deine eigene Registry (z.B. harbor.stabify.de)
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username: ${{ secrets.REGISTRY_USERNAME }}
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password: ${{ secrets.REGISTRY_PASSWORD }}
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- name: Extract metadata (tags, labels) for Docker
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id: meta
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uses: docker/metadata-action@v4
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with:
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images: ghcr.io/${{ gitea.repository }}
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tags: |
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type=ref,event=branch
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type=ref,event=pr
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type=semver,pattern={{version}}
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type=sha
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- name: Build and push Docker image
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uses: docker/build-push-action@v4
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with:
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context: .
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push: true
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tags: ${{ steps.meta.outputs.tags }}
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labels: ${{ steps.meta.outputs.labels }}
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cache-from: type=gha
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cache-to: type=gha,mode=max
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repo-gitops/apps/whoami/base/deployment.yaml
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repo-gitops/apps/whoami/base/deployment.yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: whoami
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labels:
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app: whoami
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: whoami
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template:
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metadata:
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labels:
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app: whoami
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spec:
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containers:
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- name: whoami
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image: traefik/whoami:latest
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ports:
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- containerPort: 80
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: whoami
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spec:
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selector:
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app: whoami
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ports:
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- protocol: TCP
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port: 80
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targetPort: 80
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repo-gitops/apps/whoami/base/kustomization.yaml
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repo-gitops/apps/whoami/base/kustomization.yaml
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apiVersion: kustomize.config.k8s.io/v1beta1
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kind: Kustomization
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resources:
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- deployment.yaml
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apiVersion: kustomize.config.k8s.io/v1beta1
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kind: Kustomization
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resources:
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- ../../base
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# Patches für Produktion
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patches:
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- target:
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kind: Deployment
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name: whoami
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patch: |-
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- op: replace
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path: /spec/replicas
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value: 2
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# Hier ändern wir das Image für Produktion (Das ist die Zeile, die wir beim Release anpassen!)
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images:
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- name: traefik/whoami
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newTag: v1.8.0
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repo-gitops/bootstrap/root-app.yaml
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repo-gitops/bootstrap/root-app.yaml
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apiVersion: argoproj.io/v1alpha1
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kind: Application
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metadata:
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name: production-cluster
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namespace: argocd
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finalizers:
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- resources-finalizer.argocd.argoproj.io # Löscht alle Apps, wenn diese App gelöscht wird (Vorsicht!)
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spec:
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project: default
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source:
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repoURL: https://git.stabify.de/stabify/gitops.git # URL DEINES GitOps Repos anpassen!
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targetRevision: HEAD
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path: cluster/production
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destination:
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server: https://kubernetes.default.svc
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namespace: argocd
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syncPolicy:
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automated:
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prune: true # Löscht Ressourcen, die nicht mehr im Git sind
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selfHeal: true # Repariert manuelle Änderungen automatisch
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repo-gitops/cluster/production/whoami.yaml
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repo-gitops/cluster/production/whoami.yaml
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apiVersion: argoproj.io/v1alpha1
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kind: Application
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metadata:
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name: whoami
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namespace: argocd
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spec:
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project: default
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source:
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repoURL: https://git.stabify.de/stabify/gitops.git
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targetRevision: HEAD
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path: apps/whoami/overlays/production # Zeigt auf das Overlay, nicht die Base!
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destination:
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server: https://kubernetes.default.svc
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namespace: default # Ziel-Namespace der App
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syncPolicy:
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automated:
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prune: true
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selfHeal: true
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syncOptions:
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- CreateNamespace=true # Erstellt den Namespace 'default' falls nicht vorhanden (oder 'whoami-ns')
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