Is there a tool for copying files directly from any running Kubernetes pod to another?

Asked Nov 17 '22 at 02:37

Active Nov 17 '22 at 15:06

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I would like to move a large file set from a running Kubernetes pod to another (possibly in another cluster) in order to migrate quickly from one Storage Class to another with little or no downtime.

I want the files to be copied directly from one pod to the other, preferably with rsync.

I have figured out how to accomplish the task, but I am wondering if there is an existing tool before I embark on writing one.

Is there a simple tool for reliably copying files directly from any running Kubernetes pod to another?

NB: 'kubectl cp' cannot accomplish this task as of kubectl v1.25.1

➜  ~ kubectl run --image nginx nginx1       
pod/nginx1 created
➜  ~ kubectl run --image nginx nginx2
pod/nginx2 created
➜  ~ kubectl cp nginx1:/etc/nginx.conf nginx2:/etc/nginx.conf 
error: one of src or dest must be a local file specification

edited Nov 17 '22 at 15:06

asked Nov 17 '22 at 02:37

Richard Fairthorne

use `kubectl cp` for example `kubectl cp pod-1:my-file pod-2:my-file` – asktyagi Nov 17 '22 at 07:49
@asktyagi - kubectl cp does not accomplish this task as of kubctl v1.25.1. See amendment to question a above for an example. – Richard Fairthorne Nov 17 '22 at 15:08

Is there a tool for copying files directly from any running Kubernetes pod to another?

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