15.3. 使用多个 Pod 预设置

创建 pod 预设置，类似于以下内容，以及环境变量、挂载点和/或存储卷：

kind: PodPreset
apiVersion: settings.k8s.io/v1alpha1
metadata:
  name: allow-database
spec:
  selector:
    matchLabels:
      role: frontend 1
  env:
    - name: DB_PORT
      value: "6379"
  volumeMounts:
    - mountPath: /cache
      name: cache-volume
  volumes:
    - name: cache-volume
      emptyDir: {}

创建第二个 pod 预先设置，如下所示：

kind: PodPreset
apiVersion: settings.k8s.io/v1alpha1
metadata:
  name: proxy
spec:
  selector:
    matchLabels:
      role: frontend 1
  volumeMounts:
    - mountPath: /etc/proxy/configs
      name: proxy-volume
  volumes:
    - name: proxy-volume
      emptyDir: {}

创建标准 pod 规格：

apiVersion: v1
kind: Pod
metadata:
  name: website
  labels:
    app: website
    role: frontend 1
spec:
  containers:
    - name: website
      image: ecorp/website
      ports:
        - containerPort: 80

创建 pod：

$ oc create -f pod.yaml

创建后检查 pod 规格：

apiVersion: v1
kind: Pod
metadata:
  name: website
  labels:
    app: website
    role: frontend
  annotations:
    podpreset.admission.kubernetes.io/allow-database: "resource version" 1
    podpreset.admission.kubernetes.io/proxy: "resource version" 2
spec:
  containers:
    - name: website
      image: ecorp/website
      volumeMounts:
        - mountPath: /cache
          name: cache-volume
        - mountPath: /etc/proxy/configs
          name: proxy-volume
      ports:
        - containerPort: 80
      env:
        - name: DB_PORT
          value: "6379"
  volumes:
    - name: cache-volume
      emptyDir: {}
    - name: proxy-volume
      emptyDir: {}