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firecracker-microvm / firecracker

Secure and fast microVMs for serverless computing.
http://firecracker-microvm.io
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Create RW disk snapshots of running Firecracker microVMs #886

Closed s3rj1k closed 3 years ago

s3rj1k commented 5 years ago

A way to do disk snapshoting on a runnig VM

ad-m commented 5 years ago

Let's do that. It's just file.

raduweiss commented 5 years ago

I assume you're thinking of snapshots while the guest is still running? Asking since if you stop the guest / microVM the file representing the microVMs file system that stays behind is effectively a snapshot.

s3rj1k commented 5 years ago

@raduweiss yes, while VM is running

acatangiu commented 5 years ago

What's the usecase for this?

Please always bear in mind that Firecracker is designed for short-lived specialized tasks and not a general-purpose VM.

s3rj1k commented 5 years ago

being able to make point in time backup is always a good thing

raduweiss commented 5 years ago

@s3rj1k , I thought about this for a bit, and indeed a proper backup image can't be achieved without changes in Firecracker. This is something we've also talked about in the team, and we're going to continue looking at. I'll leave the issue open so we have it on our radar (we're going to organize ourselves with some milestones in the near future).

s3rj1k commented 5 years ago

@raduweiss cool, sounds great :)

raduweiss commented 5 years ago

@s3rj1k, @ad-m, we've added something like this to the roadmap, see #1184. Figuring out exactly how this will work (e.g., if/how you rw disk snapshots) will probably be discussed as part of that issue.

acatangiu commented 3 years ago

@s3rj1k we've released dev-preview snapshotting functionality in v0.23 with full support coming up in v0.24.

Does that cover this issue?

s3rj1k commented 3 years ago

@acatangiu Yea, that's great news, thanks! https://github.com/firecracker-microvm/firecracker/blob/v0.23.0/docs/snapshotting/snapshot-support.md