I've a box with a DoM. I'd like to mount / as ro and create a tmpfs for /var (and /tmp). I don't think anything else NEEDS to be rw (the infrequent changes to /etc can be made by unlocking / to make those changes).
I imagine I can just make a tarball of a skeletal /var and unpack this over /var, once mounted? Is there a preexisting mechanism for this sort of thing? Or, do I roll my own?
