How to write a shell script to checkpoint a running process in ubuntu?

Question

CRIU or any other checkpoint/restore command cannot be used. I need to be able to restore the process on a different system.

Answer 1

That is what CRIU should be able to do. I mean create checkpoint and restore it at another machine. See CRIU documentation for container live migration:

This is the use case from what the whole checkpoint/restore project appeared. Container is checkpointed, then the image is copied on another box, then restored. From the remote observer point of view the container is just frozen for a while.

It is quite challenging to write an application that migrates a process to another machine. It would be necessary to recover process hierarchy, privileges, file descriptors, network connections, signals...

It is too many issues to describe in a single answer.