[openstack-dev] [nova] Change from Mitaka: Expected UNIX signal to generate Guru Meditation (error) Reports
davanum at gmail.com
Wed Oct 21 17:58:46 UTC 2015
If you are using the GMR code from oslo-incubator, please switch over to
the new oslo.service. I don't see any pending reviews.
On Wed, Oct 21, 2015 at 1:29 PM, Sean McGinnis <sean.mcginnis at gmx.com>
> On Wed, Oct 21, 2015 at 02:43:39PM +0200, Kashyap Chamarthy wrote:
> > Background
> > ----------
> > Oslo Guru Meditation (error) Reports (GMR)[*] are a useful debugging
> > mechanism that allows one to capture the current state of a Nova
> > process/executable (e.g. `nova-compute`, `nova-api`, etc).
> > The way to generate the error report is to supply the 'User-defined
> > signal', SIGUSR1, when killing a Nova process. E.g.
> > $ kill -USR1 `pgrep nova-compute`
> > which results in GMR being printed to your standard error ('stderr')
> > stream, wherever it ends up being redirected to (e.g. to a corresponding
> > Nova process-specific log file, otherwise, on systemd-enabled systems,
> > to its journal).
> > Change in Mitaka (and above)
> > ----------------------------
> > From the upcoming Mitaka release onwards, the default expected UNIX
> > signal to generate GMR has been changed from USR1 to USR2 (another
> > User-defined singal), because the USR1 is reserved by Apache 'mod_wsgi'
> > for its own purpose.
> > So, to generate GMR, from Mitaka release:
> > $ kill -USR2 `pgrep nova-compute`
> > A corresponding Nova documentation change has been submitted to
> > reflect this new reality.
> Do you know if anyone is working on updating all projects that GMR was
> added to? Or should we each look at our own projects and make the
> necessary changes?
> >  https://review.openstack.org/#/c/223133/ -- guru_meditation_report:
> > Use SIGUSR2 instead of SIGUSR1
> >  https://review.openstack.org/#/c/227779/ -- doc: gmr: Update
> > instructions to generate GMR error reports
> > [*] References
> > --------------
> > Related reading:
> > - http://docs.openstack.org/developer/nova/gmr.html
> > - http://docs.openstack.org/developer/oslo.reports/usage.html
> > - https://wiki.openstack.org/wiki/GuruMeditationReport
> > -
> > --
> > /kashyap
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Davanum Srinivas :: https://twitter.com/dims
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