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Try adjusting url_timeout in nova.conf, this is a new setting to allow more
time to connect to neutron.

On Sun, Feb 8, 2015 at 9:37 AM, Xinyuan Huang <huangxy0101 at gmail.com> wrote:

> Hi Jon,
>
> Could you please also paste the messages in nova scheduler logs, if
> possible?
>
> It is true that in icehouse instances might get launched individually
> before scheduler realizes no enough hosts are available, but currently this
> has been changed and number of available hosts are checked before launching
> any.
>
> Thanks,
> Xinyuan
>
>
> From: Jonathan Proulx <jon at jonproulx.com>
> Date: Fri, Feb 6, 2015 at 7:25 AM
> Subject: [Openstack] nova-sheduler timeouts in juno ...
> To: "openstack at lists.openstack.org" <openstack at lists.openstack.org>
>
> >
> >
> > Hi All,
> >
> > After upgrading from icehouse to juno I get timeouts when trying to
> > schedule >20 instances at once (20 deterministically works, 30 always
> > fails didn't bother to go finer than that)
> >
> > Note this is a single call with --max-count on the CLI or setting
> > number of instances in Horizon.  If I do parallel batched of 10 or 20
> > instances I can get hundreds to launch successfully as each set gets
> > handled by a different scheduler process.
> >
> > I know under icehouse I could get 100 or so to launch at once (then
> > neutron would start to trip over itself, so kudos on that not
> > happening anymore).  I seem to recall with icehouse instances in a
> > scheduling batch would launch individually as scheduled in juno it
> > seems none get launched until all are scheduled.
> >
> > In any case timeouts appear in nova-conductor.log one set for each
> > instance in the set all with the same message ID
> > (http://paste.openstack.org/show/168157/).
> >
> > Is anyone else seeing this / know a work around?
> >
> > Thanks,
> > -Jon
> >
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