Synchronizing root filesystems

Question

I have several testing computers and I want to automaticaly synchronize content of their root filesystems. What are the possible ways to do it? I am changing not only userspace applications and data but alse the Kernel will be changed.

Answer 1

rsync is probably what you want, and Arch wiki has a good, general purpose, document for rsyncing the root directory here.

That being said, doing what you're suggesting may render your systems unusable if hardware differs enough to make configuration files different.