For AI agents: A markdown version of this page is available at https://docs.datadoghq.com/security/code_security/iac_security/iac_rules/kubernetes-audit-log-maxbackup-not-properly-set.md. A documentation index is available at /llms.txt.

Audit log maxbackup not properly set

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Metadata

Id: kubernetes-audit-log-maxbackup-not-properly-set

Platform: Kubernetes

Severity: Low

Category: Observability

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Description

When a container or initContainer runs kube-apiserver, the --audit-log-maxbackup flag should be set to 10 or more. The rule reports a MissingAttribute when the flag is not defined and an IncorrectValue when the flag is defined with a value less than 10. Setting the flag to at least 10 helps retain rotated audit logs for a longer period.

Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: ["--audit-log-maxbackup=10"]
  restartPolicy: OnFailure

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver","--audit-log-maxbackup=15"]
      args: []
  restartPolicy: OnFailure

Non-Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: ["--audit-log-maxbackup=5"]
  restartPolicy: OnFailure

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: []
  restartPolicy: OnFailure

apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: dummy
  namespace: knative-sequence
spec:
  template:
    spec:
      containers:
      - name: command-demo-container
        image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
        command: ["kube-apiserver"]
        args: ["--audit-log-maxbackup=5"]
    restartPolicy: OnFailure
---
apiVersion: serving.knative.dev/v1
kind: Configuration
metadata:
  name: dummy-config
  namespace: knative-sequence
spec:
  template:
    spec:
      containers:
        - name: command-demo-container
          image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
          command: ["kube-apiserver"]
          args: ["--audit-log-maxbackup=5"]
      restartPolicy: OnFailure
---
apiVersion: serving.knative.dev/v1
kind: Revision
metadata:
  name: dummy-rev
  namespace: knative-sequence
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: ["--audit-log-maxbackup=5"]
  restartPolicy: OnFailure
---
apiVersion: sources.knative.dev/v1
kind: ContainerSource
metadata:
  name: dummy-cs
  namespace: knative-sequence
spec:
  template:
    spec:
      containers:
        - name: command-demo-container
          image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
          command: ["kube-apiserver"]
          args: ["--audit-log-maxbackup=5"]
      restartPolicy: OnFailure