Error restoring container from checkpoint

[NikolaBo]

I have a container running in runc, and I am able to checkpoint it: runc checkpoint containername. But when I go to restore it I get ERRO[0000] JSON specification file config.json not found .

Any advice on where to start troubleshooting this? I know that my kernel supports CRIU. It seems odd that the dump/checkpoint succeeds but the restore complains about missing a config in the checkpoint.

Version:

runc version 1.1.2
commit: a916309
spec: 1.0.2-dev
go: go1.18.3
libseccomp: 2.5.3

[kolyshkin]

When you create a container, runc takes its configuration from OCI spec, which is in a file named config.json residing in either the current directory or the directory specified via the --bundle option.

When you restore a container, you are essentially re-creating it, so config.json (same as used to create this container) is required.

Hope that makes sense.

[NikolaBo]

Thanks!