Cloud RunにGoアプリを自動デプロイ

Github
https://github.com/wmetaw/cloud-run-exec-gcloud-command

Cloud RunにGoアプリを自動デプロイ
https://www.apps-gcp.com/deploy-go-app-to-cloud-run-by-cloud-build/

main.go

package main

import (
    "fmt"
    "log"
    "net/http"
    "os"
    "os/exec"
)

func main() {

    http.HandleFunc("/", index)
    http.HandleFunc("/version", version)

    port := os.Getenv("PORT")
    if port == "" {
        port = "8080"
        log.Printf("Defauting to port %s", port)
    }

    log.Printf("Linstening on port %s", port)

    err := http.ListenAndServe(fmt.Sprintf(":%s", port), nil)
    if err != nil {
        log.Fatal(err)
    }
}

func index(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, "hello cloud run")
}

func version(w http.ResponseWriter, r *http.Request) {
    s, err := exec.Command("gcloud", "version").Output()
    if err != nil {
        log.Fatal(err)
    }

    fmt.Fprintf(w, string(s))
}

go.mod

module github.com/wmetaw/cloud-run-exec-gcloud-command

go 1.14

Dockerfile

FROM golang:1.14.4-alpine3.12 as builder
WORKDIR /go/src
COPY . .

RUN CGO_ENABLED=0 GOOS=linux go build -v -o main

FROM gcr.io/cloud-builders/gcloud:latest
WORKDIR /usr/local/bin

COPY --from=builder /go/src/main /main
ENTRYPOINT ["/main"]

cloudbuild.yaml

steps:
  # dockerビルド
  # build -t ['イメージ名:タグ'] [DcokerFileパス]
  - name: 'gcr.io/cloud-builders/docker'
    id: 'build-docker-image'
    args: ['build', '-t', 'gcr.io/$PROJECT_ID/${_SERVICE_NAME}', '.']

  # docker imageをpush
  - name: 'gcr.io/cloud-builders/docker'
    id: 'push-docker-image'
    args: ['push', 'gcr.io/$PROJECT_ID/${_SERVICE_NAME}']

  # Cloud Runへデプロイ
  # --platformはmanaged,gke,kubernetesのいずれかを指定 see https://cloud.google.com/sdk/gcloud/reference/beta/run/deploy
  - name: 'gcr.io/cloud-builders/gcloud'
    id: 'deploy-cloud-run'
    args: ['run', 'deploy', '${_SERVICE_NAME}', '--image', 'gcr.io/$PROJECT_ID/${_SERVICE_NAME}', '--region', '${_REGION}', '--platform', 'managed']

  # Cloud Run閲覧権限付与
  - name: 'gcr.io/cloud-builders/gcloud'
    id: 'apply-member-role-cloud-run'
    args: ['run', 'services', 'add-iam-policy-binding', '${_SERVICE_NAME}', '--region', '${_REGION}', '--member', 'allUsers', '--role', 'roles/run.invoker', '--platform', 'managed']

# 変数定義
# see https://cloud.google.com/cloud-build/docs/configuring-builds/substitute-variable-values?hl=ja
substitutions:
  _REGION: asia-northeast1
  _SERVICE_NAME: exec-gcloud-command

# imagesフィールドにはCloudBuildがContainerRegistry にpushする1つ以上の Dockerイメージを指定
images:
  - gcr.io/$PROJECT_ID/${_SERVICE_NAME}