注: GitHub ホステッド ランナーは、現在 GitHub Enterprise Server でサポートされていません。 GitHub public roadmap で、今後の計画的なサポートの詳細を確認できます。
Introduction
This guide explains how to use GitHub Actions to build a containerized application, push it to Google Container Registry (GCR), and deploy it to Google Kubernetes Engine (GKE) when there is a push to the main
branch.
GKE is a managed Kubernetes cluster service from Google Cloud that can host your containerized workloads in the cloud or in your own datacenter. For more information, see Google Kubernetes Engine.
Prerequisites
Before you proceed with creating the workflow, you will need to complete the following steps for your Kubernetes project. This guide assumes the root of your project already has a Dockerfile
and a Kubernetes Deployment configuration file. For an example, see google-github-actions.
Creating a GKE cluster
To create the GKE cluster, you will first need to authenticate using the gcloud
CLI. For more information on this step, see the following articles:
For example:
$ gcloud container clusters create $GKE_CLUSTER \
--project=$GKE_PROJECT \
--zone=$GKE_ZONE
Enabling the APIs
Enable the Kubernetes Engine and Container Registry APIs. For example:
$ gcloud services enable \
containerregistry.googleapis.com \
container.googleapis.com
Configuring a service account and storing its credentials
This procedure demonstrates how to create the service account for your GKE integration. It explains how to create the account, add roles to it, retrieve its keys, and store them as a base64-encoded encrypted repository secret named GKE_SA_KEY
.
-
Create a new service account:
$ gcloud iam service-accounts create $SA_NAME
-
Retrieve the email address of the service account you just created:
$ gcloud iam service-accounts list
-
Add roles to the service account. Note: Apply more restrictive roles to suit your requirements.
$ gcloud projects add-iam-policy-binding $GKE_PROJECT \ --member=serviceAccount:$SA_EMAIL \ --role=roles/container.admin $ gcloud projects add-iam-policy-binding $GKE_PROJECT \ --member=serviceAccount:$SA_EMAIL \ --role=roles/storage.admin $ gcloud projects add-iam-policy-binding $GKE_PROJECT \ --member=serviceAccount:$SA_EMAIL \ --role=roles/container.clusterViewer
-
Download the JSON keyfile for the service account:
$ gcloud iam service-accounts keys create key.json --iam-account=$SA_EMAIL
-
Store the service account key as a secret named
GKE_SA_KEY
:$ export GKE_SA_KEY=$(cat key.json | base64)
For more information about how to store a secret, see "Encrypted secrets."
Storing your project name
Store the name of your project as a secret named GKE_PROJECT
. For more information about how to store a secret, see "Encrypted secrets."
(Optional) Configuring kustomize
Kustomize is an optional tool used for managing YAML specs. After creating a kustomization
file, the workflow below can be used to dynamically set fields of the image and pipe in the result to kubectl
. For more information, see kustomize usage.
(Optional) Configure a deployment environment
環境は、一般的なデプロイ ターゲットを記述するために使用されます (例: production
、staging
、または development
)。 GitHub Actions ワークフローが環境にデプロイされると、その環境がリポジトリのメイン ページに表示されます。 環境を使用して、ジョブの続行に対する承認の要求、ワークフローをトリガーできるブランチの制限、シークレットへのアクセスの制限を実行できます。 環境の作成の詳細については、「デプロイに環境を使用する」を参照してく� さい。
Creating the workflow
Once you've completed the prerequisites, you can proceed with creating the workflow.
The following example workflow demonstrates how to build a container image and push it to GCR. It then uses the Kubernetes tools (such as kubectl
and kustomize
) to pull the image into the cluster deployment.
Under the env
key, change the value of GKE_CLUSTER
to the name of your cluster, GKE_ZONE
to your cluster zone, DEPLOYMENT_NAME
to the name of your deployment, and IMAGE
to the name of your image.
デプロイ環境を構成した� �合は、environment
の値を環境の名前に変更します。 環境を構成しなかった� �合 を使わない� �合は、environment
キーを削除します。
# このワークフローはGitHubによって認定されていないアクションを使用します。
# それらはサードパーティによって提供され、
# 別個の利用規約、プライバシーポリシー、
# ドキュメントを参照してく� さい。
# GitHub では、コミット SHA にアクションをピン留めすることが推奨されます。
# 新しいバージョンを取得するには、SHA を更新する必要があります。
# タグまたはブランチを参照することもできますが、アクションは警告なしに変更される可能性があります。
name: Build and Deploy to GKE
on:
push:
branches:
- main
env:
PROJECT_ID: ${{ secrets.GKE_PROJECT }}
GKE_CLUSTER: cluster-1 # Add your cluster name here.
GKE_ZONE: us-central1-c # Add your cluster zone here.
DEPLOYMENT_NAME: gke-test # Add your deployment name here.
IMAGE: static-site
jobs:
setup-build-publish-deploy:
name: Setup, Build, Publish, and Deploy
runs-on: ubuntu-latest
environment: production
steps:
- name: Checkout
uses: actions/checkout@v2
# Setup gcloud CLI
- uses: google-github-actions/setup-gcloud@94337306dda8180d967a56932ceb4ddcf01edae7
with:
service_account_key: ${{ secrets.GKE_SA_KEY }}
project_id: ${{ secrets.GKE_PROJECT }}
# Configure Docker to use the gcloud command-line tool as a credential
# helper for authentication
- run: |-
gcloud --quiet auth configure-docker
# Get the GKE credentials so we can deploy to the cluster
- uses: google-github-actions/get-gke-credentials@fb08709ba27618c31c09e014e1d8364b02e5042e
with:
cluster_name: ${{ env.GKE_CLUSTER }}
location: ${{ env.GKE_ZONE }}
credentials: ${{ secrets.GKE_SA_KEY }}
# Build the Docker image
- name: Build
run: |-
docker build \
--tag "gcr.io/$PROJECT_ID/$IMAGE:$GITHUB_SHA" \
--build-arg GITHUB_SHA="$GITHUB_SHA" \
--build-arg GITHUB_REF="$GITHUB_REF" \
.
# Push the Docker image to Google Container Registry
- name: Publish
run: |-
docker push "gcr.io/$PROJECT_ID/$IMAGE:$GITHUB_SHA"
# Set up kustomize
- name: Set up Kustomize
run: |-
curl -sfLo kustomize https://github.com/kubernetes-sigs/kustomize/releases/download/v3.1.0/kustomize_3.1.0_linux_amd64
chmod u+x ./kustomize
# Deploy the Docker image to the GKE cluster
- name: Deploy
run: |-
./kustomize edit set image gcr.io/PROJECT_ID/IMAGE:TAG=gcr.io/$PROJECT_ID/$IMAGE:$GITHUB_SHA
./kustomize build . | kubectl apply -f -
kubectl rollout status deployment/$DEPLOYMENT_NAME
kubectl get services -o wide
Additional resources
For more information on the tools used in these examples, see the following documentation:
- For the full starter workflow, see the "Build and Deploy to GKE" workflow.
- For more starter workflows and accompanying code, see Google's GitHub Actions example workflows.
- The Kubernetes YAML customization engine: Kustomize.
- "Deploying a containerized web application" in the Google Kubernetes Engine documentation.