# noupdateserviceaccount
#### 基本信息
- 策略类型：合规
- 推荐级别：L1
- 生效资源类型：\*
- 参数： allowedGroups：数组
  allowedUsers：数组
  
 
#### 作用
拒绝白名单外的资源更新ServiceAccount。
#### 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中定义了允许的组列表allowedGroups和允许的用户列表allowedUsers。
```
# IMPORTANT: Before deploying this policy, make sure you allow-list any groups
# or users that need to deploy workloads to kube-system, such as cluster-
# lifecycle controllers, addon managers, etc. Such controllers may need to
# update service account names during automated rollouts (e.g. of refactored
# configurations). You can allow-list them with the allowedGroups and
# allowedUsers properties of the NoUpdateServiceAccount Constraint.
apiVersion: constraints.gatekeeper.sh/v1beta1
kind: NoUpdateServiceAccount
metadata:
  name: no-update-kube-system-service-account
spec:
  match:
    namespaces: ["kube-system"]
    kinds:
    - apiGroups: [""]
      kinds:
      # You can optionally add "Pod" here, but it is unnecessary because
      # Pod service account immutability is enforced by the Kubernetes API.
      - "ReplicationController"
    - apiGroups: ["apps"]
      kinds:
      - "ReplicaSet"
      - "Deployment"
      - "StatefulSet"
      - "DaemonSet"
    - apiGroups: ["batch"]
      kinds:
      # You can optionally add "Job" here, but it is unnecessary because
      # Job service account immutability is enforced by the Kubernetes API.
      - "CronJob"
  parameters:
    allowedGroups: []
    allowedUsers: []
```
#### 符合策略实例的资源定义
没有更新ServiceAccount，符合策略实例。
```
# Note: The gator tests currently require exactly one object per example file.
# Since this is an update-triggered policy, at least two objects are technically
# required to demonstrate it. Due to the gator requirement, we only have one
# object below. The policy should allow changing everything but the
# serviceAccountName field.
kind: Deployment
apiVersion: apps/v1
metadata:
  name: policy-test
  namespace: kube-system
  labels:
    app: policy-test
spec:
  replicas: 1
  selector:
    matchLabels:
      app: policy-test-deploy
  template:
    metadata:
      labels:
        app: policy-test-deploy
    spec:
      # Changing anything except this field should be allowed by the policy.
      serviceAccountName: policy-test-sa-1
      containers:
      - name: policy-test
        image: ubuntu
        command:
        - /bin/bash
        - -c
        - sleep 99999
```