如何在 Kubernetes 中共享每个容器的卷？

Question

例如，运行 Drupal 应用程序使用 nginx:stable-alpine + drupal:8.6-fpm-alpine。

nginx 容器需要共享 /var/www/html 来自 drupal 容器的静态内容。
drupal 容器应该使用 GCP-PD 等卷从外部存储持久化或装载站点数据/var/www/html/sites。

在这种情况下，本地docker-compose.yml在下面。

version: "3"

volumes:
  www-data:

services:
  drupal:
    image: "drupal:8.6-fpm-alpine"
    volumes:
      - "www-data:/var/www/html"
      - "./sites:/var/www/html/sites"
    # ...

  nginx;
    image: "nginx:stable-alpine"
    depends_on:
      - drupal
    volumes:
      - "www-data:/var/www/html"
    # ...
# ...

如何翻译成k8s deployment.yml?

（编辑）我尝试了以下但没有用。

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mydrupal
  labels:
    app.kubernetes.io/name: mydrupal
spec:
  replicas: 2
  selector:
    matchLabels:
      app.kubernetes.io/name: mydrupal
  template:
    metadata:
      labels:
        app.kubernetes.io/name: mydrupal
    spec:
      volumes:
        - name: drupal-data
          persistentVolumeClaim:
            claimName: "drupal-pvc"
      # keep default files for the drupal installer, and chown.
      initContainers:
        - name: init-drupal-data
          image: drupal:8.6-fpm-alpine
          imagePullPolicy: IfNotPresent
          command: ['sh', '-c']
          args: ['cp -r -u /var/www/html/sites/* /tmp/drupal; chown -R www-data:www-data /tmp/drupal']
          volumeMounts:
            - name: drupal-data
              mountPath: /tmp/drupal
              subPath: sites
      securityContext:
        # www-data
        fsGroup: 33
      containers:
        - name: drupal
          image: drupal:8.6-fpm-alpine
          imagePullPolicy: IfNotPresent
          volumeMounts:
            # I want to sharing this directory with nginx container.
            - name: drupal-data
              mountPath: /var/www/html
            # I want to persist this directory using external managed storage.
            - name: drupal-data
              mountPath: /var/www/html/sites
              subPath: sites
          resources:
            limits:
              cpu: 800m
              memory: 512Mi
            requests:
              cpu: 200m
              memory: 256Mi
        - name: nginx
          image: nginx:1.14-alpine
          imagePullPolicy: IfNotPresent
          volumeMounts:
            - name: drupal-data
              mountPath: /usr/share/nginx/html
          ports:
            - name: http
              containerPort: 80
              protocol: TCP
          livenessProbe:
            httpGet:
              path: /
              port: http
            initialDelaySeconds: 120
          readinessProbe:
            httpGet:
              path: /
              port: http
            initialDelaySeconds: 30
          resources:
            limits:
              cpu: 500m
              memory: 512Mi
            requests:
              cpu: 100m
              memory: 256Mi

我阅读了 volume、pv、pvc 文档。但没有找到任何关于如何将容器内的目录公开为卷的解决方案。

有什么想法吗？

Answer 1

查看 hostPath，它将允许您将本地文件夹用作持久存储。 https://kubernetes.io/docs/concepts/storage/volumes/#hostpath

根据您的 kubernetes 集群为其他类型 pv/pvc 设置的方式，存在一些学习曲线和配置差异。

如何在 Kubernetes 中共享每个容器的卷？

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