kubectl port forwarding timeout issue

kubernetes kubectl
Stanley picture Stanley · Nov 25, 2017 · Viewed 19.2k times · Source

While using kubectl port-forward function I was able to succeed in port forwarding a local port to a remote port. However it seems that after a few minutes idling the connection is dropped. Not sure why that is so.

Here is the command used to portforward:

kubectl --namespace somenamespace port-forward somepodname 50051:50051

Error message:

Forwarding from 127.0.0.1:50051 -> 50051
Forwarding from [::1]:50051 -> 50051
E1125 17:18:55.723715    9940 portforward.go:178] lost connection to pod

Was hoping to be able to keep the connection up

Answer

akauppi picture akauppi · Feb 16, 2018

Seems there is a 5 minute timeout that can be overridden with kubelet parameters:

https://github.com/kubernetes/kubernetes/issues/19231

If you want to pass something higher than 5 minutes (or unlimited) into your kubelets, you can specify the streaming-connection-idle-timeout. E.g. --streaming-connection-idle-timeout=4h to set it to 4 hours. Or: --streaming-connection-idle-timeout=0 to make it unlimited. (DEPRECATED: This parameter should be set via the config file specified by the Kubelet's --config flag. See https://kubernetes.io/docs/tasks/administer-cluster/kubelet-config-file/ for more information.)

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