Re: [Qemu-devel] Getting VM state from outside QEMU?

[Eric Blake <eblake@redhat.com>]

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On 04/08/2015 10:21 AM, Erik Rull wrote:

>>> 172.17.48.45 ~ # telnet 127.0.0.1 4444
>>> {"QMP": {"version": {"qemu": {"micro": 0, "minor": 1, "major": 2},
>>> "package":
>>> ""}, "capabilities": []}}
>>
>> You HAVE to use {"execute":"qmp_capabilities"} (possibly with an
>> "id":...) as your first command on the monitor, before you can issue any
>> other command.  I really wish we could improve the error message:

> Thanks! That fixed it - even if I don't know why this was actually necessary :-)

docs/qmp/qmp-spec.txt

It's part of the protocol, to allow us to make non-backwards-compatible
changes to how QMP is parsed while still keeping sane interactions
between mismatches in server vs. client (to date, we have wisely not
needed to add any capabilities).

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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