更新图像标签以通过 CloudBuilder 提交 SHA 的最佳方法是什么？

Question

我有一个 deployment.yaml，其中包含 3 个容器 + LB 服务 和 cloudbuild.yaml 的部署包含每次对 Bitbucket git repo 上的某个分支进行新提交时构建容器映像的步骤。

一切正常，除了每当有新的映像版本时我的部署没有更新（我在部署中使用 :latest 标签）并且要更改这一点，我知道我的部署映像应该使用除 :latest 之外的独特的东西，例如 git commit SHA。

问题： 我不确定如何在 GCB CI 过程中执行映像声明更新以包含新的提交 SHA。

YAML 的：https://paste.ee/p/CsETr

Answer 1

通过在部署中使用图像标签或 URI 变量找到解决方案，并在构建时用 sed 替换它们。

deplyment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  namespace: dev
  name: app
  labels:
    app: app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: app
  template:
    metadata:
      labels:
        app: app
    spec:
      initContainers:
      - name: init
        image: INIT_IMAGE_NAME
        imagePullPolicy: Always
        command: ['sh', '-c', 'cp -r /app /srv; chown -R 82:82 /srv/app']
        volumeMounts:
        - name: code
          mountPath: /srv
      containers:
      - name: nginx
        image: NGINX_IMAGE_NAME
        imagePullPolicy: Always
        ports:
        - containerPort: 80
        volumeMounts:
        - name: code
          mountPath: /srv
        - name: php-socket
          mountPath: /var/run
        livenessProbe:
          httpGet:
            path: /health.html
            port: 80
            httpHeaders:
            - name: X-Healthcheck
              value: Checked
          initialDelaySeconds: 5
          timeoutSeconds: 1
          periodSeconds: 15
        readinessProbe:
          httpGet:
            path: /health.html
            port: 80
            httpHeaders:
            - name: X-Healthcheck
              value: Checked
          initialDelaySeconds: 5
          timeoutSeconds: 1
          periodSeconds: 15
      - name: php
        image: PHP_IMAGE_NAME
        imagePullPolicy: Always
        volumeMounts:
        - name: code
          mountPath: /srv
        - name: php-socket
          mountPath: /var/run
        livenessProbe:
          httpGet:
            path: /health.html
            port: 80
            httpHeaders:
            - name: X-Healthcheck
              value: Checked
          initialDelaySeconds: 5
          timeoutSeconds: 1
          periodSeconds: 15
        readinessProbe:
          httpGet:
            path: /health.html
            port: 80
            httpHeaders:
            - name: X-Healthcheck
              value: Checked
          initialDelaySeconds: 5
          timeoutSeconds: 1
          periodSeconds: 15
      volumes:
        - name: code
          emptyDir: {}
        - name: php-socket
          emptyDir: {}
---
apiVersion: v1
kind: Service
metadata:
  namespace: dev
  name: app-service
spec:
  type: LoadBalancer
  ports:
  - port: 80
    targetPort: 80
    protocol: TCP
  selector:
    app: app

cloudbuild.yaml

steps:

# Build Images
- id: Building Init Image
  name: gcr.io/cloud-builders/docker
  args: ['build','-t', 'eu.gcr.io/$PROJECT_ID/init:$SHORT_SHA', '-f', 'init.dockerfile', '.']

- id: Building Nginx Image
  name: gcr.io/cloud-builders/docker
  args: ['build','-t', 'eu.gcr.io/$PROJECT_ID/nginx:$SHORT_SHA', '-f', 'nginx.dockerfile', '.']
  waitFor: ['-']

- id: Building PHP-FPM Image
  name: gcr.io/cloud-builders/docker
  args: ['build','-t', 'eu.gcr.io/$PROJECT_ID/php:$SHORT_SHA', '-f', 'php.dockerfile', '.']
  waitFor: ['-']


# Push Images
- id: Pushing Init Image
  name: gcr.io/cloud-builders/docker
  args: ['push','eu.gcr.io/$PROJECT_ID/init:$SHORT_SHA']

- id: Pushing Nginx Image
  name: gcr.io/cloud-builders/docker
  args: ['push','eu.gcr.io/$PROJECT_ID/nginx:$SHORT_SHA']

- id: Pushing PHP-FPM Image
  name: gcr.io/cloud-builders/docker
  args: ['push','eu.gcr.io/$PROJECT_ID/php:$SHORT_SHA']


# Update Image Tags
- id: 'Setting Init Image Tag'
  name: ubuntu
  args: ['bash','-c','sed -i "s,INIT_IMAGE_NAME,eu.gcr.io/$PROJECT_ID/init:$SHORT_SHA," deployment.yaml']

- id: 'Setting Nginx Image Tag'
  name: ubuntu
  args: ['bash','-c','sed -i "s,NGINX_IMAGE_NAME,eu.gcr.io/$PROJECT_ID/nginx:$SHORT_SHA," deployment.yaml']

- id: 'Setting PHP Image Tag'
  name: ubuntu
  args: ['bash','-c','sed -i "s,PHP_IMAGE_NAME,eu.gcr.io/$PROJECT_ID/php:$SHORT_SHA," deployment.yaml']


# Update Deployment
- id: Updating Deployment
  name: gcr.io/cloud-builders/kubectl
  args: ['apply','-f','deployment.yaml']

  env:
    - CLOUDSDK_COMPUTE_ZONE=europe-west2-b
    - CLOUDSDK_CONTAINER_CLUSTER=clusterx

# Images
images:
  - eu.gcr.io/$PROJECT_ID/init:$SHORT_SHA
  - eu.gcr.io/$PROJECT_ID/nginx:$SHORT_SHA
  - eu.gcr.io/$PROJECT_ID/php:$SHORT_SHA

# Tags
tags:
  - master
  - dev
  - init

Answer 2

我相信 Kubernetes 不会提取它已经拥有的镜像（因为它使用相同的标签 :latest）。

我认为您的系统将受益于使用新标签：

- id: Updating Deployment
  name: gcr.io/cloud-builders/kubectl
  args: ['set', 'image', 'deployment/app', 'nginx=eu.gcr.io/$PROJECT_ID/nginx:$SHORT_SHA']
  env:
    - CLOUDSDK_COMPUTE_ZONE=europe-west1-b
    - CLOUDSDK_CONTAINER_CLUSTER=cluster-1

（您还必须为其他容器设置图像。

另一种技术是使用新标签更新您的部署文件，并应用整个文件。