add example

kubernetes/zhigang_example/backend.yaml

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+# fastapi-deployment.yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: backend-deployment
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: backend
+  template:
+    metadata:
+      labels:
+        app: backend
+    spec:
+      containers:
+      - name: backend-container
+        image: zglian/backend:latest
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 8000
+        # - containerPort: 3000
+---
+# backend-service.yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: backend-service
+spec:
+  type: NodePort
+  # type: ClusterIP
+  selector:
+    app: backend
+  ports:
+    - protocol: TCP
+    #   port: 3000
+    #   targetPort: 3000
+      port: 8000
+      targetPort: 8000
+      nodePort: 32601

kubernetes/zhigang_example/docker-publish.yml

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+name: Docker
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+on:
+  #schedule:
+  #  - cron: '29 15 * * *'
+  push:
+    branches: [ "master" ]
+    # Publish semver tags as releases.
+  #  tags: [ 'v*.*.*' ]
+  #pull_request:
+  #  branches: [ "master" ]
+
+env:
+  # Use docker.io for Docker Hub if empty
+  REGISTRY: ghcr.io
+  # github.repository as <account>/<repo>
+  IMAGE_NAME: ${{ github.repository }}
+
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      # Install the cosign tool except on PR
+      # https://github.com/sigstore/cosign-installer
+      - name: Install cosign
+        if: github.event_name != 'pull_request'
+        uses: sigstore/cosign-installer@6e04d228eb30da1757ee4e1dd75a0ec73a653e06 #v3.1.1
+        with:
+          cosign-release: 'v2.1.1'
+
+      # Set up BuildKit Docker container builder to be able to build
+      # multi-platform images and export cache
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@96383f45573cb7f253c731d3b3ab81c87ef81934 # v5.0.0
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@0565240e2d4ab88bba5387d719585280857ece09 # v5.0.0
+        with:
+          context: "{{defaultContext}}:docker_images"
+          file: centos7.Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      # Sign the resulting Docker image digest except on PRs.
+      # This will only write to the public Rekor transparency log when the Docker
+      # repository is public to avoid leaking data.  If you would like to publish
+      # transparency data even for private images, pass --force to cosign below.
+      # https://github.com/sigstore/cosign
+      - name: Sign the published Docker image
+        if: ${{ github.event_name != 'pull_request' }}
+        env:
+          # https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-an-intermediate-environment-variable
+          TAGS: ${{ steps.meta.outputs.tags }}
+          DIGEST: ${{ steps.build-and-push.outputs.digest }}
+        # This step uses the identity token to provision an ephemeral certificate
+        # against the sigstore community Fulcio instance.
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}

kubernetes/zhigang_example/frontend.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: zhigang-app-service
+spec:
+  selector:
+    app: zhigang-node-web-app
+  ports:
+    - protocol: "TCP"
+      port: 8080
+      targetPort: 3000
+      nodePort: 32700
+  type: NodePort
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: zhigang-node-web-app
+spec:
+  selector:
+    matchLabels:
+      app: zhigang-node-web-app
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: zhigang-node-web-app
+    spec:
+      containers:
+        - name: node-web-app-zhigang
+          image: zglian/node-web-app
+          imagePullPolicy: Always
+          ports:
+            - containerPort: 3000
+

kubernetes/zhigang_example/helm 6e6301b7877047bfb9f738822b7af0f3.md

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+# helm
+
+```bash
+#add helm repository
+$helm repo add bitnami https://charts.bitnami.com/bitnami
+$helm repo update
+
+#Create and Apply Persistent Storage Volume
+#避免pod被刪掉之後資料消失
+$kubectl apply -f postgres-pv.yaml
+
+#Create and Apply Persistent Volume Claim
+#連接到PV
+$kubectl apply -f postgres-pvc.yaml
+
+#install helm chart
+helm install [release-name] [repo-name] --set persistence.existingClaim=[pvc-name] --set volumePermissions.enabled=true
+
+#查看預設密碼
+$kubectl get secret --namespace default psql-test-postgresql -o jsonpath="{.data.postgresql-password}" | base64 --decode
+
+#port foward to localhost
+#在一個terminal執行
+$kubectl port-forward --namespace default svc/psql-test-postgresql 5432:5432
+
+#在另一個terminal執行登入到psql
+$psql --host 127.0.0.1 -U postgres -d postgres -p 5432
+
+#I also run pgadmin on localhost to look up db, and use alembic to initialize it.
+
+```

kubernetes/zhigang_example/initialize_db_alembic.py

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+from sqlalchemy import Column, Integer, String, Date, UnicodeText, DateTime
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()
+
+class User(Base):
+    __tablename__ = 'user'
+
+    UserName = Column(String, primary_key = True)
+    password = Column(String, nullable = False)
+    birthday = Column(Date)
+    last_login = Column(DateTime)
+    create_time = Column(DateTime)

kubernetes/zhigang_example/postgres-pv.yaml

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+apiVersion: v1
+kind: PersistentVolume
+metadata:
+  name: zhi-postgresql-pv
+  labels:
+    type: local
+spec:
+  storageClassName: manual
+  capacity:
+    storage: 10Gi
+  accessModes:
+    - ReadWriteOnce
+  hostPath:
+    path: "/mnt/data"

kubernetes/zhigang_example/postgres-pvc.yaml

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+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: zhi-postgresql-pv-claim
+spec:
+  storageClassName: manual
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 10Gi