Support Checkpoint/Restore in Firecracker

[jtestard]

Checkpoint/Restore functionality exists in Docker and other container runtimes.

It does not exist yet for kata-containers, but is planned.

Is there any plan to implement such functionality in firecracker?

[jtestard]

And as a follow up, could it be done using KVM's own migration tools

[iggy]

A docker runtime running inside firecracker could do that. I'll let one of the devs speak to whether it's a planned feature (I think the answer is very long from now if ever).

Regarding using KVM support for that, there's a lot of userspace code required for migration/save/restore. Qemu spent a long time getting that right (and it's still not perfect).

[raduweiss]

@jtestard, @iggy, we've added something like this to the roadmap, see #1184. Figuring out exactly how this will work (e.g., if/how you can achieve the checkpoint restore as requested here) will probably be discussed as part of that issue.

[dianpopa]

Hi @jtestard ,

Firecracker added support for creating a snapshot of a microVM and later start a new one from that. This is still in developer preview but if you are interested you can read the details here.