Kubectl Exec Times Out After 4 Hours

Problem

The **kubectl exec **command is timing out after exactly 4 hours.

Below is the output of the default config map:

$ kubectl describe cm worker-default-kubelet-config -n kube-system
Name: worker-default-kubelet-config
Namespace: kube-system
Labels: <none>
Annotations: <none>

Data
====
kubelet:
----
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
authentication:
anonymous:
enabled: false
webhook:
enabled: true
x509:
clientCAFile: "/etc/pf9/kube.d/certs/kubelet/server/ca.crt"
authorization:
mode: AlwaysAllow
clusterDNS:
- "10.21.0.10"
clusterDomain: "cluster.local"
featureGates:
PodPriority: true
DynamicKubeletConfig: true
maxPods: 200
readOnlyPort: 0
tlsCertFile: "/etc/pf9/kube.d/certs/kubelet/server/request.crt"

Environment

  • Platform9 Managed Kubernetes - All Versions

Cause

The value for streaming-connection-idle-timeout parameter is not set in Kubelet configuration which is responsible for the maximum time a streaming connection can be idle before the connection is automatically closed. The value "0" indicates no timeout. As the value is not defined the command kubectl exec is timing out after 4 hours.

Resolution

Update the configmap and set the value of streamingConnectionIdleTimeout and verify if the change is successful.

# kubectl edit cm worker-default-kubelet-config -n kube-system

# kubectl describe cm worker-default-kubelet-config -n kube-system | grep "streamingConnectionIdleTimeout"
streamingConnectionIdleTimeout: "672h"

Additional Information

Refer the Dynamic Kubelet Configuration for more information.

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Kubectl Exec Times Out After 4 HoursProblemEnvironmentCauseResolutionAdditional Information