Memory limits not defined

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Metadata

Id: b14d1bc4-a208-45db-92f0-e21f8e2588e9

Cloud Provider: k8s

Platform: Kubernetes

Severity: Medium

Category: Resource Management

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Description

Memory limits (resources.limits.memory) should be defined for each container (including initContainers) to prevent resource exhaustion by ensuring containers cannot consume more memory than allotted. Defining memory limits helps maintain cluster stability and predictable resource scheduling.

Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: memory-demo-negative
  namespace: mem-example
spec:
  containers:
  - name: memory-demo-ctr
    image: polinux/stress
    resources:
      limits:
        memory: "200Mi"
      requests:
        memory: "100Mi"
    command: ["stress"]
    args: ["--vm", "1", "--vm-bytes", "150M", "--vm-hang", "1"]

apiVersion: apps/v1
kind: Deployment
metadata:
  name: test-deployment-neg
  labels:
    app: test-neg
spec:
  replicas: 3
  selector:
    matchLabels:
      app: test-neg
  template:
    metadata:
      labels:
        app: test-neg
    spec:
      containers:
        - name:  pause
          image: k8s.gcr.io/pause
          resources:
            limits:
              cpu: 0.5
              memory: 512Mi
            requests:
              cpu: 0.5
              memory: 512Mi

Non-Compliant Code Examples

apiVersion: apps/v1
kind: Deployment
metadata:
  name: test-deployment
  labels:
    app: test
spec:
  replicas: 3
  selector:
    matchLabels:
      app: test
  template:
    metadata:
      labels:
        app: test
    spec:
      containers:
        - name:  pause
          image: k8s.gcr.io/pause
          resources:
            limits:
              cpu: 1
            requests:
              cpu: 0.5
              memory: 512Mi

apiVersion: v1
kind: Pod
metadata:
  name: memory-demo-1
  namespace: mem-example
spec:
  containers:
  - name: memory-demo-ctr
    image: polinux/stress
    resources:
      requests:
        cpu: "0.5"
    command: ["stress"]
    args: ["--vm", "1", "--vm-bytes", "150M", "--vm-hang", "1"]
---
apiVersion: v1
kind: Pod
metadata:
  name: memory-demo-2
  namespace: mem-example
spec:
  containers:
  - name: memory-demo-ctr
    image: polinux/stress
    resources:
      requests:
        cpu: "0.5"
    command: ["stress"]
    args: ["--vm", "1", "--vm-bytes", "150M", "--vm-hang", "1"]
---
apiVersion: v1
kind: Pod
metadata:
  name: memory-demo-3
  namespace: mem-example
spec:
  containers:
  - name: memory-demo-ctr
    image: polinux/stress
    command: ["stress"]
    args: ["--vm", "1", "--vm-bytes", "150M", "--vm-hang", "1"]
---
apiVersion: v1
kind: Pod
metadata:
  name: memory-demo-4
  namespace: mem-example
spec:
  securityContext:
    runAsUser: 1000
    runAsGroup: 3000
    fsGroup: 2000
  volumes:
    - name: sec-ctx-vol
      emptyDir: { }
  containers:
  - name: memory-demo-ctr
    image: polinux/stress
    command: ["stress"]