[libvirt-users] Making remote access to qemu://session easier?

[Lars Kellogg-Stedman]

This is frustrating:

  $ export LIBVIRT_DEFAULT_URI=qemu+ssh://remotehost/session
  $ virsh list
  error: failed to connect to the hypervisor
  error: no valid connection
  error: Operation not supported: Connecting to session instance without socket path is not supported by the ssh connection driver

Has there been any thought given to making this easier?  It seems that
having a simple helper script on the remote host that could make the
same "use $XDG_RUNTIME_DIR or use $HOME/.confg" decision as libvirtd
would be able determine the socket path automatically.

Would that be a reasonable solution?

I see that right now, even support for qemu://remotehost/system
requires that "virsh" knows that path to the remote socket, so having
a remote helper that can read the libvirt configuration might simplify
things in general.

That is, I am envisioning that for .../session connections, virsh
would do something like:

    ssh remotehost libvirt-socket-helper --user

And for .../system connections, virsh would do something like:

    ssh remotehost libvirt-socket-helper --system

Rather than:

   ssh remotehost sh -c 'if nc -q 2>&1 | grep \"requires an argument\"
   >/dev/null 2>&1; then ARG=-q0;else ARG=;fi;nc $ARG -U /var/run/libvirt/libvirt-sock'


And in either of the above cases, "libvirt-socket-helper" would parse
the environment and the libvirtd configuration as necessary and
ultimately act like "nc -U /path/to/some/socket".

-- 
Lars Kellogg-Stedman <lars at redhat.com> | larsks @ {freenode,twitter,github}
Cloud Engineering / OpenStack          | http://blog.oddbit.com/

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