[libvirt-users] "failed to connect to the hypervisor"

Martin Kletzander mkletzan at redhat.com
Tue Oct 20 09:33:19 UTC 2015

On Mon, Oct 19, 2015 at 03:57:39PM -0400, Ken D'Ambrosio wrote:
>Hi, all.  Ubuntu host, attempting to get virsh working with
>VirtualBox... and failing.  Here's what happens:
>root at foobox:~# virsh -c vbox:///session list
>error: failed to connect to the hypervisor
>error: internal error: unable to initialize VirtualBox driver API

What version of VirtualBox do you have installed?  The logging in that
driver is not particularly loud, so this won't tell you much more than
the fact that the initialization just failed.  It's most probably
something missing in your system or you have to new version installed.

>Now, most of the docs I read about "failed to connect to the
>hypervisor" have other errors that happen *before* the "failed to
>connect" one, that are the root cause (e.g., unable to open socket, or
>bad cert, or whatever).  But that's not the case, here.  And what
>puzzles me more is that -- while I don't know what the output *should*
>look like -- to my eye, strace seems to say that we're getting
>information back:
>1940  read(5, "Node 1 MemTotal:       33011680 kB\nNode 1 MemFree:
>32565612 kB\nNode 1 MemUsed:          446068 kB\nNode 1 Active:
>57948 kB\nNode 1 Inactive:          77036 kB\nNode 1 Active(anon):
>27688 kB\nNode 1 Inactive(anon):       84 kB\nNode 1 Active(file):
>30260 kB\nNode 1 Inactive(file):    76952 kB\nNode 1 Unevictable:
>52 kB\nNode 1
>In my googling, I see mention of per-VM XML files that... do
>something.  But what they do, and how they're generated, doesn't seem
>clear.  (E.g., XML mentioned here: http://libvirt.org/drvvbox.html --
>it just sort of sits there, with no context.)  Is that something I
>Thanks for any enlightenment you might be able to offer me,
>libvirt-users mailing list
>libvirt-users at redhat.com
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