add syncpod

[hashmap-kz]

Hello! The new plugin page: https://github.com/hashmap-kz/kubectl-syncpod/tree/master

Motivation

There are plenty of tools with seemingly similar functionality at first glance.
Some of them mount PVCs locally, others transfer data between PVCs, perform backups, etc.
However, I was surprised to find that none of them can efficiently transfer files to and from a PVC—especially in a fast and concurrent manner.

Of course, there's always the manual approach: running a debug Pod or building a custom image with the necessary tools—but that's a long and cumbersome way to get things done.

Currently, I'm developing a tool for PostgreSQL WAL archiving, and I ran into a roadblock when I needed to transfer a large amount of data inside a PVC.

If the volume is hostPath-based, it's relatively straightforward—you can simply copy the required files onto the target node. But with CSI-backed volumes, where the PVC is mounted as a block device, things become more complex.

In my case, I have three primary storage classes: hostPath, Ceph RBD, and NFS.
Most of my PostgreSQL instances use RBD volumes, so without a lot of shell magic, you can’t just "copy something in" directly.

I've tested this tool with Ceph RBD, distroless-based images, and hostPath PVCs.
It performs much faster than kubectl cp or kubectl exec. With those, I gave up waiting for even a 100 GiB copy to finish—and that's a relatively small amount of data.

Perhaps someone will find it useful too.
Best regards!

[ahmetb]

🤖 Beep beep! I’m a robot speaking on behalf of @ahmetb. 🤖

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/kind new-plugin

[k8s-ci-robot]

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This pull-request has been approved by: hashmap-kz
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[hashmap-kz]

/assign ahmetb