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feat: add demo apps and workflows to build
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‎.github/workflows/build-apps.yml

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name: Build demo apps
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on:
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push:
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branches:
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- main
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paths:
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- 'apps/**'
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jobs:
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hello-world:
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runs-on: ubuntu-latest
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permissions:
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contents: read
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packages: write
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steps:
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- name: checkout
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uses: actions/checkout@v4
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- name: setup qemu
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uses: docker/setup-qemu-action@v3
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- name: setup docker
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uses: docker/setup-buildx-action@v3
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- name: login to ghcr.io
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uses: docker/login-action@v3
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with:
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registry: ghcr.io
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: docker metadata
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uses: docker/metadata-action@v5
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id: hello_world_meta
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with:
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images: |
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ghcr.io/${{ github.repository }}/apps/hello-world
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tags: |
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type=sha,format=long
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type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
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- name: build and push
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uses: docker/build-push-action@v5
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with:
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context: /apps/hello-world
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platforms: linux/amd64,linux/arm64
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push: true
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tags: ${{ steps.hello_world_meta.outputs.tags }}
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labels: ${{ steps.hello_world_meta.outputs.labels }}
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probes:
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runs-on: ubuntu-latest
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permissions:
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contents: read
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packages: write
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steps:
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- name: checkout
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uses: actions/checkout@v4
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- name: setup qemu
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uses: docker/setup-qemu-action@v3
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- name: setup docker
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uses: docker/setup-buildx-action@v3
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- name: login to ghcr.io
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uses: docker/login-action@v3
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with:
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registry: ghcr.io
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: docker metadata
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uses: docker/metadata-action@v5
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id: probe_meta
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with:
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images: |
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ghcr.io/${{ github.repository }}/apps/probes
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tags: |
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type=sha,format=long
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type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
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- name: build and push
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uses: docker/build-push-action@v5
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with:
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context: /apps/probes
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platforms: linux/amd64,linux/arm64
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push: true
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tags: ${{ steps.probe_meta.outputs.tags }}
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labels: ${{ steps.probe_meta.outputs.labels }}
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blue-green:
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runs-on: ubuntu-latest
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permissions:
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contents: read
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packages: write
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steps:
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- name: checkout
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uses: actions/checkout@v4
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- name: setup qemu
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uses: docker/setup-qemu-action@v3
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- name: setup docker
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uses: docker/setup-buildx-action@v3
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- name: login to ghcr.io
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uses: docker/login-action@v3
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with:
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registry: ghcr.io
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: docker metadata (blue)
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uses: docker/metadata-action@v5
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id: blue_meta
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with:
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images: |
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ghcr.io/${{ github.repository }}/apps/blue-green
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tags: |
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type=sha,format=long
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type=raw,value=blue
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- name: docker metadata (green)
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uses: docker/metadata-action@v5
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id: green_meta
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with:
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images: |
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ghcr.io/${{ github.repository }}/apps/blue-green
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tags: |
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type=sha,format=long
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type=raw,value=green
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- name: build and push (blue)
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uses: docker/build-push-action@v5
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with:
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context: /apps/blue-green
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platforms: linux/amd64,linux/arm64
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build-args: |
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IS_BLUE=true
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push: true
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tags: ${{ steps.green_meta.outputs.tags }}
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labels: ${{ steps.green_meta.outputs.labels }}
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- name: build and push (green)
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uses: docker/build-push-action@v5
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with:
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context: /apps/blue-green
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platforms: linux/amd64,linux/arm64
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build-args: |
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IS_BLUE=false
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push: true
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tags: ${{ steps.green_meta.outputs.tags }}
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labels: ${{ steps.green_meta.outputs.labels }}
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‎apps/blue-green/Dockerfile

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FROM golang:1.22 as builder
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ARG IS_BLUE=true
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WORKDIR /go/src/app
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COPY . .
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RUN go mod download
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RUN CGO_ENABLED=0 GOOS=linux go build -ldflags "-X main.IsBlue=${IS_BLUE}" -a -installsuffix cgo -o blue-green .
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FROM debian:bookwork-slim as runtime
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WORKDIR /app
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COPY --from=builder /go/src/app/blue-green .
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CMD [ "/app/blue-green" ]

‎apps/blue-green/go.mod

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module github.com/vojtechmares/kubernetes-training/apps/blue-green
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go 1.22.0
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require github.com/google/uuid v1.6.0 // indirect

‎apps/blue-green/go.sum

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github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
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github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=

‎apps/blue-green/main.go

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package main
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import (
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"fmt"
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"log"
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"net/http"
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"os"
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"strconv"
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"text/template"
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"github.com/google/uuid"
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)
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var IsBlue string = "true"
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const html = `
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<!DOCTYPE html>
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<html>
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<head>
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<title>Hello, Kubernetes! | {{ .Hostname }}</title>
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<style>
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body {
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font-family: Helvetica;
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background-color: {{ .Color }};
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color: #fff;
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}
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pre {
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margin: 0.25rem 0;
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font-size: 1.5rem;
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}
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</style>
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</head>
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<body>
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<div style="display: flex; flex-direction: column; justify-content: center; align-items: center;">
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<h1 style="font-size: 4rem;">Hello, Kubernetes! 👋</h1>
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<pre>hostname: {{ .Hostname }}</pre>
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<pre>instanceID: {{ .InstanceID }}</pre>
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</div>
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</body>
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</html>
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`
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func main() {
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instanceID := uuid.New().String()
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hostname, err := os.Hostname()
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if err != nil {
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log.Fatal(err)
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}
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var hexColor string = "#15803d" // green
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isBlue, err := strconv.ParseBool(IsBlue)
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if err != nil {
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log.Fatal(err)
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}
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if isBlue {
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hexColor = "#1d4ed8"
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}
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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tpl, err := template.New("index.html").Parse(html)
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if err != nil {
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log.Println(err)
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w.Write([]byte(fmt.Sprintf("Error: %s", err)))
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return
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}
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err = tpl.Execute(w, map[string]string{"Hostname": hostname, "InstanceID": instanceID, "Color": hexColor})
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if err != nil {
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log.Println(err)
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w.Write([]byte(fmt.Sprintf("Error: %s", err)))
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return
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}
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w.Header().Set("Content-Type", "text/html")
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})
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log.Println("Starting server on :8080")
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http.ListenAndServe(":8080", nil)
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}

‎apps/hello-world/Dockerfile

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FROM golang:1.22 as builder
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WORKDIR /go/src/app
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COPY . .
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RUN go mod download
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RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o hello-world .
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FROM debian:bookwork-slim as runtime
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WORKDIR /app
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COPY --from=builder /go/src/app/hello-world .
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CMD [ "/app/hello-world" ]

‎apps/hello-world/go.mod

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module github.com/vojtechmares/kubernetes-training/apps/probes
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go 1.22.0
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require github.com/google/uuid v1.6.0

‎apps/hello-world/go.sum

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github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
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github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=

‎apps/hello-world/main.go

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package main
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import (
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"fmt"
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"log"
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"net/http"
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"os"
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"text/template"
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"github.com/google/uuid"
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)
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const html = `
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<!DOCTYPE html>
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<html>
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<head>
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<title>Hello, Kubernetes! | {{ .Hostname }}</title>
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<style>
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body {
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font-family: Helvetica;
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}
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pre {
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margin: 0.25rem 0;
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font-size: 1.5rem;
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}
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</style>
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</head>
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<body style="font-family: Helvetica">
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<div style="display: flex; flex-direction: column; justify-content: center; align-items: center;">
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<h1 style="font-size: 4rem;">Hello, Kubernetes! 👋</h1>
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<pre>hostname: {{ .Hostname }}</pre>
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<pre>instanceID: {{ .InstanceID }}</pre>
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</div>
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</body>
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</html>
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`
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func main() {
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instanceID := uuid.New().String()
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hostname, err := os.Hostname()
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if err != nil {
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log.Fatal(err)
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}
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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tpl, err := template.New("index.html").Parse(html)
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if err != nil {
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log.Println(err)
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w.Write([]byte(fmt.Sprintf("Error: %s", err)))
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return
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}
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err = tpl.Execute(w, map[string]string{"Hostname": hostname, "InstanceID": instanceID})
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if err != nil {
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log.Println(err)
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w.Write([]byte(fmt.Sprintf("Error: %s", err)))
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return
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}
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w.Header().Set("Content-Type", "text/html")
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})
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log.Println("Starting server on :8080")
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http.ListenAndServe(":8080", nil)
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}

‎apps/probes/Dockerfile

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FROM golang:1.22 as builder
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WORKDIR /go/src/app
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COPY . .
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RUN go mod download
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RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o probes .
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FROM debian:bookwork-slim as runtime
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WORKDIR /app
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COPY --from=builder /go/src/app/probes .
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CMD [ "/app/probes" ]

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