# k8spspcapabilities
#### 基本信息
- 策略类型：安全
- 推荐级别：L3
- 生效资源类型：Pod
- 参数： allowedCapabilities：数组
  exemptImages：字符串数组
  requiredDropCapabilities：数组
  
 
#### 作用
限制PodSecurityPolicy中的"allowedCapabilities"和"requiredDropCapabilities"字段。
#### 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中定义了allowedCapabilities和requiredDropCapabilities的列表。
```
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: K8sPSPCapabilities
metadata:
  name: capabilities-demo
spec:
  match:
    kinds:
      - apiGroups: [""]
        kinds: ["Pod"]
    namespaces:
      - "default"
  parameters:
    allowedCapabilities: ["something"]
    requiredDropCapabilities: ["must_drop"]
```
#### 符合策略实例的资源定义
示例capabilities中的各项参数符合策略实例。
```
apiVersion: v1
kind: Pod
metadata:
  name: opa-allowed
  labels:
    owner: me.agilebank.demo
spec:
  containers:
    - name: opa
      image: openpolicyagent/opa:0.9.2
      args:
        - "run"
        - "--server"
        - "--addr=localhost:8080"
      securityContext:
        capabilities:
          add: ["something"]
          drop: ["must_drop", "another_one"]
      resources:
        limits:
          cpu: "100m"
          memory: "30Mi"
```
#### 不符合策略实例的资源定义
示例capabilities中的参数不符合策略实例。
```
apiVersion: v1
kind: Pod
metadata:
  name: opa-disallowed
  labels:
    owner: me.agilebank.demo
spec:
  containers:
    - name: opa
      image: openpolicyagent/opa:0.9.2
      args:
        - "run"
        - "--server"
        - "--addr=localhost:8080"
      securityContext:
        capabilities:
          add: ["disallowedcapability"]
      resources:
        limits:
          cpu: "100m"
          memory: "30Mi"
```