Google Container Engine 中的 pod 如何相互通信/链接

Question

我摆弄这个例子：https://cloud.google.com/container-engine/docs/tutorials/persistent-disk/

我的修改： - 我正在使用我自己的 Wordpress 图片 [x] Works

服务启动（它需要更多的 CPU 0.8 而不是 0.5，但现在它可以工作了）

• 我想使用 mariadb 而不是 mysql [ ] 失败！

我无法弄清楚两个 pod 是如何连接在一起的！！！！ ~5h + 仍然失败

这是我的 .yaml 文件

apiVersion: v1
kind: Pod
metadata:
  name: wpsite
  labels:
    name: wpsite
spec:
  containers:
    - image: <my image on gcr.io>
      name: wpsite

      env:
        - name: WORDPRESS_DB_PASSWORD
          # Change this - must match mysql.yaml password.
          value: example
      ports:
        - containerPort: 80
          name: wpsite

      volumeMounts:
          # Name must match the volume name below.
        - name: wpsite-disk
          # Mount path within the container.
          mountPath: /var/www/html

  volumes:
    - name: wpsite-disk
      gcePersistentDisk:
        # This GCE persistent disk must already exist.
        pdName: wpsite-disk
        fsType: ext4

服务：

apiVersion: v1
kind: Service
metadata:
  labels:
    name: wpsite
  name: wpsite
spec:
  type: LoadBalancer
  ports:
    # The port that this service should serve on.
    - port: 80
      targetPort: 80
      protocol: TCP

  # Label keys and values that must match in order to receive traffic for this service.
  selector:
    name: wpsite

mariadb:

apiVersion: v1
kind: Pod
metadata:
  name: mariadb
  labels:
    name: mariadb
spec:
  containers:
    - resources:
        limits:
          # 0.5 hat nicht funktioniert
          # Fehlermeldung in: kubectl describe pod mariadb
          cpu: 0.8

      image: mariadb:10.1
      name: mariadb
      env:
        - name: MYSQL_ROOT_PASSWORD
          # Change this password!
          value: example

      ports:
        - containerPort: 3306
          name: mariadb

      volumeMounts:
          # This name must match the volumes.name below.
        - name: mariadb-persistent-storage
          mountPath: /var/lib/mysql
  volumes:
    - name: mariadb-persistent-storage
      gcePersistentDisk:
        # This disk must already exist.
        pdName: mariadb-disk
        fsType: ext4

maria-db-服务：

apiVersion: v1
kind: Service
metadata:
  labels:
    name: mariadb
  name: mariadb
spec:
  ports:
    # The port that this service should serve on.
    - port: 3306

  # Label keys and values that must match in
  # order to receive traffic for this service.
  selector:
    name: mysql

kubectl logs wpsite 显示如下错误消息：Warning: mysqli::mysqli(): php_network_getaddresses: getaddrinfo failed: Name or service not known in - on line 10

Answer 1

好的 - 找到了！

这是 mariadb-service.yaml 中的名称 metadata.name 必须是 mysql 而不是 mariadb，mariadb-service 中的选择器必须指向 mariadb（pod）

这里是工作文件：

mariadb.yaml

apiVersion: v1
kind: Pod

metadata:
  name: mariadb

  labels:
    name: mariadb
spec:
  containers:
    - resources:
        limits:
          # 0.5 hat nicht funktioniert
          # Fehlermeldung in: kubectl describe pod mariadb
          cpu: 0.8

      image: mariadb:10.1
      name: mariadb
      env:
        - name: MYSQL_ROOT_PASSWORD
          # Change this password!
          value: example

      ports:
        - containerPort: 3306
          name: mariadb

      volumeMounts:
          # This name must match the volumes.name below.
        - name: mariadb-persistent-storage
          mountPath: /var/lib/mysql
  volumes:
    - name: mariadb-persistent-storage
      gcePersistentDisk:
        # This disk must already exist.
        pdName: mariadb-disk
        fsType: ext4

mariadb-service.yaml

apiVersion: v1
kind: Service

metadata:
  name: mysql

  labels:
    name: mysql
spec:
  ports:
    # The port that this service should serve on.
    - port: 3306

  # Label keys and values that must match in
  # order to receive traffic for this service.
  selector:
    name: mariadb

wpsite.yaml

apiVersion: v1
kind: Pod

metadata:
  name: wpsite

  labels:
    name: wpsite
spec:
  containers:
    - image: <change this to your imagename on gcr.io>
      name: wpsite

      env:
        - name: WORDPRESS_DB_PASSWORD
          # Change this - must match mysql.yaml password.
          value: example
      ports:
        - containerPort: 80
          name: wpsite

      volumeMounts:
          # Name must match the volume name below.
        - name: wpsite-disk
          # Mount path within the container.
          mountPath: /var/www/html

  volumes:
    - name: wpsite-disk
      gcePersistentDisk:
        # This GCE persistent disk must already exist.
        pdName: wpsite-disk
        fsType: ext4

wpsite-service.yaml

apiVersion: v1
kind: Service

metadata:
  name: wpsite

  labels:
    name: wpsite
spec:
  type: LoadBalancer
  ports:
    # The port that this service should serve on.
    - port: 80
      targetPort: 80
      protocol: TCP

  # Label keys and values that must match in order to receive traffic for this service.
  selector:
    name: wpsite

使用这些设置我运行：（我的 yaml 文件在 gke 下）

$ kubectl create -f gke/mariadb.yaml

# Check
$ kubectl get pod

$ kubectl create -f gke/mariadb-service.yaml

# Check 
$ kubectl get service mysql!!!! (name in mariadb = mysql)

$ kubectl create -f gke/wpsite.yaml

# Check
$ kubectl get pod

$ kubectl create -f gke/wpsite-service.yaml

# Check
$ kubectl describe service wpsite

希望这对某人有所帮助...