# k8spspvolumetypes
#### 基本信息
- 策略类型：安全
- 推荐级别：L3
- 生效资源类型：Pod
- 参数： volumes：数组
  
 
#### 作用
约束PodSecurityPolicy中的"volumes"字段类型。
#### 策略实例示例
以下策略实例展示了策略定义生效的资源类型，parameters的volumes字段定义了允许的类型列表。
```
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sPSPVolumeTypes
metadata:
  name: psp-volume-types
spec:
  match:
    kinds:
      - apiGroups: [""]
        kinds: ["Pod"]
  parameters:
    volumes:
    # - "*" # * may be used to allow all volume types
    - configMap
    - emptyDir
    - projected
    - secret
    - downwardAPI
    - persistentVolumeClaim
    #- hostPath #required for allowedHostPaths
    - flexVolume #required for allowedFlexVolumes
```
#### 符合策略实例的资源定义
示例中volumes中的类型均在上述定义的允许范围内，符合策略实例。
```
apiVersion: v1
kind: Pod
metadata:
  name: nginx-volume-types-allowed
  labels:
    app: nginx-volume-types
spec:
  containers:
  - name: nginx
    image: nginx
    volumeMounts:
    - mountPath: /cache
      name: cache-volume
  - name: nginx2
    image: nginx
    volumeMounts:
    - mountPath: /cache2
      name: demo-vol
  volumes:
  - name: cache-volume
    emptyDir: {}
  - name: demo-vol
    emptyDir: {}
```
#### 不符合策略实例的资源定义
示例中volumes中的类型（hostPath）不在上述定义的允许范围内，不符合策略实例。
```
apiVersion: v1
kind: Pod
metadata:
  name: nginx-volume-types-disallowed
  labels:
    app: nginx-volume-types
spec:
  containers:
  - name: nginx
    image: nginx
    volumeMounts:
    - mountPath: /cache
      name: cache-volume
  - name: nginx2
    image: nginx
    volumeMounts:
    - mountPath: /cache2
      name: demo-vol
  volumes:
  - name: cache-volume
    hostPath:
      path: /tmp # directory location on host
  - name: demo-vol
    emptyDir: {}
```