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Kubelet streaming connection timeout disabled

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Metadata

Id: kubernetes-kubelet-streaming-connection-timeout-disabled

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: Medium

Category: Networking and Firewall

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Description

The --streaming-connection-idle-timeout flag should not be set to 0. The rule also checks container command entries in containers and initContainers, and the KubeletConfiguration field streamingConnectionIdleTimeout should not be set to 0s. Setting the timeout to zero disables the idle timeout and can allow connections to remain open indefinitely, increasing the risk of resource exhaustion or unintended exposure.

Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: foo/bar
      command: ["kubelet"]
      args: [""]
  restartPolicy: OnFailure

apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: "192.168.0.8"
port: 20250
serializeImagePulls: false
evictionHard:
    memory.available:  "200Mi"

{
    "address": "192.168.0.8",
    "apiVersion": "kubelet.config.k8s.io/v1beta1",
    "evictionHard": {
        "memory.available": "200Mi"
    },
    "kind": "KubeletConfiguration",
    "port": 20250,
    "serializeImagePulls": false
}

Non-Compliant Code Examples

apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: "192.168.0.8"
port: 20250
serializeImagePulls: false
evictionHard:
    memory.available:  "200Mi"
streamingConnectionIdleTimeout: 0s

{
    "apiVersion": "kubelet.config.k8s.io/v1beta1",
    "evictionHard": {
        "memory.available": "200Mi"
    },
    "kind": "KubeletConfiguration",
    "serializeImagePulls": false,
    "address": "192.168.0.8",
    "port": 20250,
    "streamingConnectionIdleTimeout": "0s"
}

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: foo/bar
      command: ["kubelet"]
      args: ["--streaming-connection-idle-timeout=0"]
  restartPolicy: OnFailure