Setting up a buildfarm with chroot

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Different virtual machines is definitely going to be the more reliable way to run all three build farm roles on one hardware system. I'm pretty sure that chroots alone won't be sufficient unless you're also doing process and network isolation.

I haven't tried to run docker within an lxc/lxd container but if you set up your container permissions sufficiently to allow that you might be able to use lxc/lxd. I'd recommend that over docker containers because docker containers generally don't run a full system complete with init and process supervision, which the buildfarm_deployment expects and essentially requires.

I'd have to dig in deeper on whether I'd expect chroot's to be enough isolation. There are likely going to be issues with port numbers once you start trying to run things even if the files don't overlap.

I don't think that there's anything inherently impossible, but I'd suggest using VMs instead to get full isolation. The chroot's will be a lot more work as it's something that's never been tested and likely will have corner cases that will need to be figured out.