Re: xl with xenstore stubdom

[Daniel De Graaf <dgdegra@tycho.nsa.gov>]

On 04/22/2013 08:19 AM, Ian Campbell wrote:
> On Mon, 2013-04-22 at 13:09 +0100, Andrew Cooper wrote:
>> On 22/04/13 13:05, steve_1991@hushmail.com wrote:
>>> Hi,
>>>
>>> I am running xenstore stubdom on my system. When I try to use xl, it gives me error that xenstore daemon is not running and couldn't stat /var/run/xenstored.pid. I want to ask does xl work with xenstore stubdom and if not then which toolstack to use for VM management?
>>>
>>> S
>>
>> xl unconditionally looks for /var/run/xenstored.pid, even when it
>> doesn't need it.
>
> Wasn't there a patch at one point to make it look
> for /tool/xenstored/domid as an alternative? Can't find it now though...

The domain creation code looks there, but it's rather difficult to
look in xenstore for a path if xenstore isn't running, so that can't
be used to figure out the stubdom is being used.

> There was also talk of init-xenstore-domain daemonising and serving as a
> log message pump to syslog for the stubdom, in which case its pid would
> be somewhat appropriate to store. I think that was only talk though.

Right, init-xenstore-domain just boots the domain and exits. I guess
touching the /var/run/xenstored.pid file might be useful as an addition
to that tool.

>> Simply touching the file is enough to fool xl into working correctly for
>> actions not requiring xenstored, but I have no idea how well xl would
>> cope with xenstored in a different domain.
>
> It should be OK, I'd be interested in hearing if it isn't once this
> issue is fixed.
>
> Ian.

It seems to work with no issues on my test systems (whose startup scripts
include a "touch /var/run/xenstored.pid" to work around this).

-- 
Daniel De Graaf
National Security Agency