On 2019-03-11T13:27:23 -0400 Shawn Webb <shawn.w...@hardenedbsd.org> wrote: > > Both FreeBSD and Linux supports virtio_console(4). I have no idea > about OpenBSD, but I'm sure they'd be open to an implementation if > asked.
Right. > > The NFS solution would work, but it would be somewhat fragile. What > happens when a VM crashes? What happens when the host crashes? At least in my case: If the VM crashes, it'll be restarted by a process supervisor (runit, here). If the host crashes, I likely have bigger problems. In any case, I think that's still fine because all the host would care about is if the guest's file was touched more recently than the last time the host tried to start a bhyve process for it. I suppose I should elaborate a bit: I do have monitoring via Prometheus in place, but I'd like to try to stagger VM startups a little as starting up a lot of them in parallel on boot tends to overwhelm the machine slightly. Once they're all up and running in a steady state, things are fine. I would typically stagger the startup of ordinary services (inside a jail, for example) by using dependencies in runit - it has a facility to pause a service until a dependent service has been started. Unfortunately, that can't work in this case because once the bhyve process has been started, the host can't tell if/when the guest has actually fully started up. As far as runit is concerned, the service is up and so any dependent services should be started too. -- Mark Raynsford | http://www.io7m.com
pgpJ0XYUfieQs.pgp
Description: OpenPGP digital signature
