├── go.mod ├── Dockerfile ├── Dockerfile.multistage ├── .github └── workflows │ ├── ci-smoketest.yml │ └── ci-cd.yml ├── main_test.go ├── main.go ├── README.md ├── go.sum └── LICENSE /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/olliefr/docker-gs-ping 2 | 3 | go 1.19 4 | 5 | require github.com/labstack/echo/v4 v4.10.2 6 | 7 | require ( 8 | github.com/golang-jwt/jwt v3.2.2+incompatible // indirect 9 | github.com/labstack/gommon v0.4.0 // indirect 10 | github.com/mattn/go-colorable v0.1.13 // indirect 11 | github.com/mattn/go-isatty v0.0.17 // indirect 12 | github.com/valyala/bytebufferpool v1.0.0 // indirect 13 | github.com/valyala/fasttemplate v1.2.2 // indirect 14 | golang.org/x/crypto v0.7.0 // indirect 15 | golang.org/x/net v0.8.0 // indirect 16 | golang.org/x/sys v0.6.0 // indirect 17 | golang.org/x/text v0.8.0 // indirect 18 | golang.org/x/time v0.3.0 // indirect 19 | ) 20 | -------------------------------------------------------------------------------- /Dockerfile: -------------------------------------------------------------------------------- 1 | # syntax=docker/dockerfile:1 2 | 3 | FROM golang:1.19 4 | 5 | # Set destination for COPY 6 | WORKDIR /app 7 | 8 | # Download Go modules 9 | COPY go.mod go.sum ./ 10 | RUN go mod download 11 | 12 | # Copy the source code. Note the slash at the end, as explained in 13 | # https://docs.docker.com/engine/reference/builder/#copy 14 | COPY *.go ./ 15 | 16 | # Build 17 | RUN CGO_ENABLED=0 GOOS=linux go build -o /docker-gs-ping 18 | 19 | # To bind to a TCP port, runtime parameters must be supplied to the docker command. 20 | # But we can (optionally) document in the Dockerfile what ports 21 | # the application is going to listen on by default. 22 | # https://docs.docker.com/engine/reference/builder/#expose 23 | EXPOSE 8080 24 | 25 | # Run 26 | CMD [ "/docker-gs-ping" ] 27 | -------------------------------------------------------------------------------- /Dockerfile.multistage: -------------------------------------------------------------------------------- 1 | # syntax=docker/dockerfile:1 2 | 3 | ## 4 | ## Build the application from source 5 | ## 6 | 7 | FROM golang:1.19 AS build-stage 8 | 9 | WORKDIR /app 10 | 11 | COPY go.mod go.sum ./ 12 | RUN go mod download 13 | 14 | COPY *.go ./ 15 | 16 | RUN CGO_ENABLED=0 GOOS=linux go build -o /docker-gs-ping 17 | 18 | ## 19 | ## Run the tests in the container 20 | ## 21 | 22 | FROM build-stage AS run-test-stage 23 | RUN go test -v ./... 24 | 25 | ## 26 | ## Deploy the application binary into a lean image 27 | ## 28 | 29 | FROM gcr.io/distroless/base-debian11 AS build-release-stage 30 | 31 | WORKDIR / 32 | 33 | COPY --from=build-stage /docker-gs-ping /docker-gs-ping 34 | 35 | EXPOSE 8080 36 | 37 | USER nonroot:nonroot 38 | 39 | ENTRYPOINT ["/docker-gs-ping"] 40 | -------------------------------------------------------------------------------- /.github/workflows/ci-smoketest.yml: -------------------------------------------------------------------------------- 1 | name: Run a smoke test (CI) 2 | 3 | # The smoke test runs on *any* push to the repo and can also be triggered manually. 4 | # It does a simple build and test using Go toolchain directly in the GitHub runner. 5 | on: 6 | push: 7 | workflow_dispatch: 8 | 9 | jobs: 10 | build-and-test: 11 | runs-on: ubuntu-latest 12 | steps: 13 | - name: Checkout code 14 | uses: actions/checkout@v3 15 | with: 16 | persist-credentials: false 17 | 18 | - name: Install Go 19 | uses: actions/setup-go@v3 20 | with: 21 | go-version-file: go.mod 22 | 23 | - name: Fetch required Go modules 24 | run: go mod download 25 | 26 | - name: Build 27 | run: go build -v ./... 28 | 29 | - name: Test 30 | run: go test -v ./... 31 | -------------------------------------------------------------------------------- /main_test.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "testing" 6 | ) 7 | 8 | // A simple example of unit testing a function. 9 | // Adapted from: https://gobyexample.com/testing-and-benchmarking 10 | 11 | func TestIntMinBasic(t *testing.T) { 12 | ans := IntMin(2, -2) 13 | if ans != -2 { 14 | t.Errorf("IntMin(2, -2) = %d; want -2", ans) 15 | } 16 | } 17 | 18 | func TestIntMinTableDriven(t *testing.T) { 19 | var tests = []struct { 20 | a, b int 21 | want int 22 | }{ 23 | {0, 1, 0}, 24 | {1, 0, 0}, 25 | {2, -2, -2}, 26 | {0, -1, -1}, 27 | {-1, 0, -1}, 28 | } 29 | for _, tt := range tests { 30 | testname := fmt.Sprintf("%d,%d", tt.a, tt.b) 31 | t.Run(testname, func(t *testing.T) { 32 | ans := IntMin(tt.a, tt.b) 33 | if ans != tt.want { 34 | t.Errorf("got %d, want %d", ans, tt.want) 35 | } 36 | }) 37 | } 38 | } 39 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "net/http" 5 | "os" 6 | 7 | "github.com/labstack/echo/v4" 8 | "github.com/labstack/echo/v4/middleware" 9 | ) 10 | 11 | func main() { 12 | 13 | e := echo.New() 14 | 15 | e.Use(middleware.Logger()) 16 | e.Use(middleware.Recover()) 17 | 18 | e.GET("/", func(c echo.Context) error { 19 | return c.HTML(http.StatusOK, "Hello, Docker! <3") 20 | }) 21 | 22 | e.GET("/health", func(c echo.Context) error { 23 | return c.JSON(http.StatusOK, struct{ Status string }{Status: "OK"}) 24 | }) 25 | 26 | httpPort := os.Getenv("PORT") 27 | if httpPort == "" { 28 | httpPort = "8080" 29 | } 30 | 31 | e.Logger.Fatal(e.Start(":" + httpPort)) 32 | } 33 | 34 | // Simple implementation of an integer minimum 35 | // Adapted from: https://gobyexample.com/testing-and-benchmarking 36 | func IntMin(a, b int) int { 37 | if a < b { 38 | return a 39 | } 40 | return b 41 | } 42 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # docker-gs-ping 2 | 3 | A simple Go server/microservice example for [Docker's Go Language Guide](https://docs.docker.com/language/golang/). 4 | 5 | Notable features: 6 | 7 | * Includes a [multi-stage `Dockerfile`](https://github.com/olliefr/docker-gs-ping/blob/main/Dockerfile.multistage). 8 | * Has a CI pipeline using GitHub Actions to run tests. 9 | * Has a CD pipeline using GitHub Actions to publish to Docker Hub. 10 | 11 | ## Want _moar_?! 12 | 13 | There is a more advanced example in [olliefr/docker-gs-ping-roach](https://github.com/olliefr/docker-gs-ping-roach) using [CockroachDB](https://github.com/cockroachdb/cockroach). 14 | 15 | ## Contributing 16 | 17 | This was written for an _introduction_ section of the Docker tutorial and as such it favours brevity and pedagogical clarity over robustness. 18 | 19 | Thus, feedback is welcome, but please no nits or pedantry. Ain't nobody got time for that 🙃 20 | 21 | ## License 22 | 23 | [Apache-2.0 License](LICENSE) 24 | -------------------------------------------------------------------------------- /.github/workflows/ci-cd.yml: -------------------------------------------------------------------------------- 1 | name: Release to Docker Hub if tests OK (CI/CD) 2 | 3 | on: 4 | push: 5 | branches: 6 | - 'main' 7 | tags: 8 | - 'v*' 9 | pull_request: 10 | branches: 11 | - 'main' 12 | 13 | jobs: 14 | build-and-test: 15 | runs-on: ubuntu-latest 16 | steps: 17 | - name: Checkout code 18 | uses: actions/checkout@v3 19 | with: 20 | persist-credentials: false 21 | 22 | - name: Docker meta 23 | id: meta 24 | uses: docker/metadata-action@v4 25 | with: 26 | images: | 27 | ${{ secrets.DOCKER_HUB_USERNAME }}/${{ github.event.repository.name }} 28 | tags: | 29 | type=ref,event=branch 30 | type=ref,event=pr 31 | type=semver,pattern={{version}} 32 | type=semver,pattern={{major}}.{{minor}} 33 | type=semver,pattern={{major}} 34 | 35 | - name: Set up Docker Buildx 36 | uses: docker/setup-buildx-action@v2 37 | 38 | - name: Cache Docker layers 39 | uses: actions/cache@v3 40 | with: 41 | path: /tmp/.buildx-cache 42 | key: ${{ runner.os }}-buildx-${{ github.sha }} 43 | restore-keys: | 44 | ${{ runner.os }}-buildx- 45 | 46 | - name: Build app and run tests in Docker 47 | uses: docker/build-push-action@v4 48 | with: 49 | file: Dockerfile.multistage 50 | target: run-test-stage 51 | cache-from: type=local,src=/tmp/.buildx-cache 52 | cache-to: type=local,dest=/tmp/.buildx-cache 53 | 54 | - name: Login to Docker Hub 55 | uses: docker/login-action@v2 56 | if: github.event_name != 'pull_request' 57 | with: 58 | username: ${{ secrets.DOCKER_HUB_USERNAME }} 59 | password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }} 60 | 61 | - name: Push release to Docker Hub 62 | uses: docker/build-push-action@v4 63 | if: github.event_name != 'pull_request' 64 | with: 65 | push: true 66 | file: Dockerfile.multistage 67 | target: build-release-stage 68 | tags: ${{ steps.meta.outputs.tags }} 69 | labels: ${{ steps.meta.outputs.labels }} 70 | cache-from: type=local,src=/tmp/.buildx-cache 71 | cache-to: type=local,dest=/tmp/.buildx-cache 72 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 2 | github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= 3 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 4 | github.com/golang-jwt/jwt v3.2.2+incompatible h1:IfV12K8xAKAnZqdXVzCZ+TOjboZ2keLg81eXfW3O+oY= 5 | github.com/golang-jwt/jwt v3.2.2+incompatible/go.mod h1:8pz2t5EyA70fFQQSrl6XZXzqecmYZeUEB8OUGHkxJ+I= 6 | github.com/labstack/echo/v4 v4.10.2 h1:n1jAhnq/elIFTHr1EYpiYtyKgx4RW9ccVgkqByZaN2M= 7 | github.com/labstack/echo/v4 v4.10.2/go.mod h1:OEyqf2//K1DFdE57vw2DRgWY0M7s65IVQO2FzvI4J5k= 8 | github.com/labstack/gommon v0.4.0 h1:y7cvthEAEbU0yHOf4axH8ZG2NH8knB9iNSoTO8dyIk8= 9 | github.com/labstack/gommon v0.4.0/go.mod h1:uW6kP17uPlLJsD3ijUYn3/M5bAxtlZhMI6m3MFxTMTM= 10 | github.com/mattn/go-colorable v0.1.11/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4= 11 | github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA= 12 | github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg= 13 | github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94= 14 | github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM= 15 | github.com/mattn/go-isatty v0.0.17 h1:BTarxUcIeDqL27Mc+vyvdWYSL28zpIhv3RoTdsLMPng= 16 | github.com/mattn/go-isatty v0.0.17/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM= 17 | github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= 18 | github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= 19 | github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 20 | github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg= 21 | github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk= 22 | github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw= 23 | github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc= 24 | github.com/valyala/fasttemplate v1.2.1/go.mod h1:KHLXt3tVN2HBp8eijSv/kGJopbvo7S+qRAEEKiv+SiQ= 25 | github.com/valyala/fasttemplate v1.2.2 h1:lxLXG0uE3Qnshl9QyaK6XJxMXlQZELvChBOCmQD0Loo= 26 | github.com/valyala/fasttemplate v1.2.2/go.mod h1:KHLXt3tVN2HBp8eijSv/kGJopbvo7S+qRAEEKiv+SiQ= 27 | golang.org/x/crypto v0.7.0 h1:AvwMYaRytfdeVt3u6mLaxYtErKYjxA2OXjJ1HHq6t3A= 28 | golang.org/x/crypto v0.7.0/go.mod h1:pYwdfH91IfpZVANVyUOhSIPZaFoJGxTFbZhFTx+dXZU= 29 | golang.org/x/net v0.8.0 h1:Zrh2ngAOFYneWTAIAPethzeaQLuHwhuBkuV6ZiRnUaQ= 30 | golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc= 31 | golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= 32 | golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= 33 | golang.org/x/sys v0.0.0-20211103235746-7861aae1554b/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= 34 | golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= 35 | golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ= 36 | golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= 37 | golang.org/x/text v0.8.0 h1:57P1ETyNKtuIjB4SRd15iJxuhj8Gc416Y78H3qgMh68= 38 | golang.org/x/text v0.8.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8= 39 | golang.org/x/time v0.3.0 h1:rg5rLMjNzMS1RkNLzCG38eapWhnYLFYXDXj2gOlr8j4= 40 | golang.org/x/time v0.3.0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= 41 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 42 | gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 43 | gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= 44 | gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= 45 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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