[cestith]

One of the stated advantages various places of having a unikernel build as a regular ELF binary on Linux or BSD (including the semi-BSD macOS) is that you can use it as your instrumented debug build very easily. Yes, you can instrument your app heavily. You can have console output. You can log to a mounted volume, to an object store, or to a remote log server with rsyslog or something like Elastic. But with an ELF binary on an OS you can strace, dtrace, fence it, run it under gdb or another debugger, instrument the OS under it, or whatever. Then the same source code builds essentially the same program to run right on KVM or Xen with no OS under it for security and efficiency.