bhyve Inside a Jail: The FreeBSD Feature Nobody Uses

Table of Contents Table of Contents What bhyve Is, and What It Is Not Loading the modules Raw bhyve, Once vm-bhyve as the Daily Interface Storage: zvol or Raw Image Networking, and the Diagram That Explains Everything The Actual Subject: bhyve Inside a Jail Why bother The four things that have to line up The fifth thing, which is deliberately absent The full jail configuration Bringing vm-bhyve up inside it What this does not buy you Failure Modes What I Would Keep I have written about jails on this blog often enough that the position is not in doubt. Jails are cheap, they are fast, they are the right default, and the vast majority of what people run in virtual machines would be happier in a jail. That is still what I believe. It is also, occasionally, wrong. A jail shares the host kernel. That single sentence is the whole boundary of the technology. The moment your workload needs a kernel that is not the host’s kernel, no amount of enthusiasm for jails will help you, and you need a…