diff --git a/.github/workflows/docker-cloud.yml b/.github/workflows/docker-cloud.yml new file mode 100644 index 000000000..da9f9823d --- /dev/null +++ b/.github/workflows/docker-cloud.yml @@ -0,0 +1,46 @@ +name: docker-cloud go tests +on: [push] +defaults: + run: + working-directory: docker-cloud +jobs: + test: + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Set up Go + uses: actions/setup-go@v3 + with: + go-version-file: "docker-cloud/go.mod" + cache-dependency-path: "docker-cloud/go.sum" + cache: true + - name: Build + run: go build -v ./... + - name: Test + run: go test -v ./... + publish: + needs: test + permissions: + id-token: write + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - name: Configure AWS Credentials + uses: aws-actions/configure-aws-credentials@v1 + with: + role-to-assume: arn:aws:iam::464590638146:role/GitHubActionECRPublicPushImage + aws-region: us-east-1 + - name: Login to Amazon ECR Public + id: login-ecr-public + uses: aws-actions/amazon-ecr-login@v1 + with: + registry-type: public + - name: Build, tag, and push docker image to Amazon ECR Public + env: + REGISTRY: ${{ steps.login-ecr-public.outputs.registry }} + REGISTRY_ALIAS: w0k4j6h5 + REPOSITORY: immersive-go-course/docker-cloud + IMAGE_TAG: ${{ github.sha }} + run: | + docker build -t $REGISTRY/$REGISTRY_ALIAS/$REPOSITORY:$IMAGE_TAG . + docker push $REGISTRY/$REGISTRY_ALIAS/$REPOSITORY:$IMAGE_TAG diff --git a/docker-cloud/Dockerfile b/docker-cloud/Dockerfile new file mode 100644 index 000000000..d2eba39fc --- /dev/null +++ b/docker-cloud/Dockerfile @@ -0,0 +1,26 @@ +# syntax=docker/dockerfile:1 + +## Build +FROM golang:1.19-bullseye as build + +WORKDIR /app + +COPY go.mod ./ +COPY go.sum ./ + +RUN go mod download + +COPY *.go ./ + +RUN go build -o /out + +## Deploy +FROM gcr.io/distroless/base-debian11 + +WORKDIR / + +COPY --from=build /out /out + +EXPOSE 80 + +ENTRYPOINT ["/out"] \ No newline at end of file diff --git a/docker-cloud/IMPLEMENTATION.md b/docker-cloud/IMPLEMENTATION.md new file mode 100644 index 000000000..7790ce7ee --- /dev/null +++ b/docker-cloud/IMPLEMENTATION.md @@ -0,0 +1,135 @@ +# docker-cloud implementation + +To get familiar with Docker, complete parts 1, 2 and 3 of [this tutorial](https://docs.docker.com/get-started/), after which you should know about: + +- Running applications with docker: `docker run -dp 80:80 docker/getting-started` +- Containers and images: process & filesystem isolation +- `Dockerfile`: a text-based script of instructions that is used to create a container image +- Starting, managing processes and images: `docker ps` and `docker rm -f`s + +Next work through the [Go Docker tutorial](https://docs.docker.com/language/golang/), after which you should know about: + +- Dockerising a go application +- Starting and stopping containers +- Volumes & networking between docker containers +- Basics of docker-compose and CockroachDB +- GitHub actions for pushing the image to Docker Hub + +To get familiar with ECS, run through the [AWS tutorial](https://aws.amazon.com/getting-started/hands-on/deploy-docker-containers/), after which you should know about: + +- Container & task: like a blueprint for your application +- Service & load balancing: launches and maintains copies of the task definition in your cluster +- Cluster: compute resources used to run the service & load balancing + +--- + +The task will be to bring this all together to run an application that we've written on Elastic Container Service: + +- Build a simple Go server +- Dockerise it to run locally within a container +- Write tests that run against the docker container +- Build GitHub actions automate CI/CD +- Push the image to ECR (not Docker Hub) +- Launch it in ECS using the UI + +## Server + +Write a server in Go with this behaviour: + +```console +> curl localhost:8090/ping +pong +``` + +Write a `Dockerfile` including a multi-stage build: + +```Dockerfile +# syntax=docker/dockerfile:1 + +## Build +FROM golang:1.19-bullseye as build + +WORKDIR /app + +COPY go.mod ./ +# This line need to be commented out until such a file exists, once we add a +# dependency on `dockertest`. +# COPY go.sum ./ + +RUN go mod download + +COPY *.go ./ + +RUN go build -o /out + +## Deploy +FROM gcr.io/distroless/base-debian11 + +WORKDIR / + +COPY --from=build /out /out + +EXPOSE 80 + +ENTRYPOINT ["/out"] +``` + +Build & run: + +```console +> docker build . -t docker-cloud +[+] Building 22.6s (15/15) FINISHED +... +> docker run -dp 8090:8090 docker-cloud +306cf309f3970d5380cd07c3a54aead7ee8cf4f6726b752fecaec39e40da69f5 +> curl localhost:8090/ping +pong +``` + +## Tests + +For writing tests, we'll use [dockertest](https://github.com/ory/dockertest). The principle is to test against real running services, end to end, in containers. + +```console +go get -u github.com/ory/dockertest/v3 +``` + +Following [docs here](https://github.com/ory/dockertest) and [example here](https://github.com/olliefr/docker-gs-ping), write some tests. + +Make sure to uncomment `COPY go.sum ./` from the `Dockerfile`. + +## GitHub action to run tests + +Follow [this guide on GitHub](https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go) to get a GitHub action testing the code. + +Pay attention to: + +```yml +defaults: + run: + working-directory: docker-cloud +``` + +And: + +```yml +- name: Set up Go + uses: actions/setup-go@v3 + with: + go-version-file: "docker-cloud/go.mod" + cache-dependency-path: "docker-cloud/go.sum" + cache: true +``` + +### Action to publish image + +This is complex. + +[Guide here](https://benoitboure.com/securely-access-your-aws-resources-from-github-actions) was very helpful. + +Actions used: + +- https://github.com/aws-actions/configure-aws-credentials +- https://github.com/aws-actions/amazon-ecr-login + +Consider: setting up a CYF public ECR repository with the right permissions. diff --git a/docker-cloud/go.mod b/docker-cloud/go.mod new file mode 100644 index 000000000..4034a4c27 --- /dev/null +++ b/docker-cloud/go.mod @@ -0,0 +1,32 @@ +module github.com/CodeYourFuture/immersive-go-course/docker-cloud + +go 1.19 + +require ( + github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 // indirect + github.com/Microsoft/go-winio v0.5.2 // indirect + github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5 // indirect + github.com/cenkalti/backoff/v4 v4.1.3 // indirect + github.com/containerd/continuity v0.3.0 // indirect + github.com/docker/cli v20.10.18+incompatible // indirect + github.com/docker/docker v20.10.18+incompatible // indirect + github.com/docker/go-connections v0.4.0 // indirect + github.com/docker/go-units v0.5.0 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect + github.com/imdario/mergo v0.3.13 // indirect + github.com/mitchellh/mapstructure v1.5.0 // indirect + github.com/moby/term v0.0.0-20220808134915-39b0c02b01ae // indirect + github.com/opencontainers/go-digest v1.0.0 // indirect + github.com/opencontainers/image-spec v1.0.2 // indirect + github.com/opencontainers/runc v1.1.4 // indirect + github.com/ory/dockertest/v3 v3.9.1 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/sirupsen/logrus v1.9.0 // indirect + github.com/xeipuuv/gojsonpointer v0.0.0-20190905194746-02993c407bfb // indirect + github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect + github.com/xeipuuv/gojsonschema v1.2.0 // indirect + golang.org/x/net v0.0.0-20220919232410-f2f64ebce3c1 // indirect + golang.org/x/sys v0.0.0-20220919091848-fb04ddd9f9c8 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect +) diff --git a/docker-cloud/go.sum 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+ Port string +} + +func main() { + port := os.Getenv("HTTP_PORT") + if port == "" { + port = "80" + } + + config := Config{ + Port: port, + } + + http.HandleFunc("/ping", func(w http.ResponseWriter, r *http.Request) { + w.Write([]byte("pong")) + }) + + http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { + w.Write([]byte("Hello, world.")) + }) + + log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", config.Port), nil)) +} diff --git a/docker-cloud/main_test.go b/docker-cloud/main_test.go new file mode 100644 index 000000000..6b2ee92cb --- /dev/null +++ b/docker-cloud/main_test.go @@ -0,0 +1,65 @@ +package main_test + +import ( + "fmt" + "io" + "log" + "net/http" + "os" + "testing" + + "github.com/ory/dockertest/v3" +) + +var pool *dockertest.Pool +var resource *dockertest.Resource + +func TestMain(m *testing.M) { + var err error + pool, err = dockertest.NewPool("") + if err != nil { + log.Fatalf("Could not connect to docker daemon: %s", err) + } + + resource, err = pool.BuildAndRun("docker-cloud-test", "./Dockerfile", nil) + if err != nil { + log.Fatalf("Could not build/run: %s", err) + } + + exitCode := m.Run() + + if err := pool.Purge(resource); err != nil { + log.Fatalf("Could not cleanup: %s", err) + } + + os.Exit(exitCode) +} + +func TestPing(t *testing.T) { + var err error + + var resp *http.Response + err = pool.Retry(func() error { + var err error + t.Log(resource.GetPort("80/tcp")) + resp, err = http.Get(fmt.Sprint("http://localhost:", resource.GetPort("80/tcp"), "/ping")) + if err != nil { + t.Log("container not ready, waiting...") + return err + } + return nil + }) + + if err != nil { + t.Fatalf("response error after retries: %s", err) + } + body, err := io.ReadAll(resp.Body) + if err != nil { + t.Fatalf("error reading response body: %s", err) + } + + want := "pong" + if got := string(body); want != got { + t.Fatalf("bad response: want %q got %q", want, got) + } +}