[ovirt-devel] [VDSM] dynamic tuning of logging

[Nir Soffer]

----- Original Message -----
> From: "Francesco Romani" <fromani at redhat.com>
> To: devel at ovirt.org
> Sent: Wednesday, March 4, 2015 10:21:00 AM
> Subject: [ovirt-devel] [VDSM] dynamic tuning of logging
> 
> Hi everyone,
> 
> I'd like to allow VDSM to change the verbosity of its loggers at runtime,
> without restarting the daemon.
> 
> Doing so, we could make the default silent, and we'll also offer a convenient
> way for users to enable/disable debug log. When something has to be debugged
> or better understood, one can temporarily increase verbosiness, and then
> restore
> the normal level, with minimal service disruption (= no vdsmd restart).
> 
> Currently vdsm uses the standard 'logging' module, which, to best of my
> knowledge,
> allows to tune levels at runtime since forever.
> 
> So, the main concern is the interface. I see these options, from the one I
> like
> the most to the one I like the least:
> 
> 1. add a inotify helper/trigger, just reload the config file when changed.
>    Seems safe and convenient, but will lead to a "complex" patch.
> 
> 2. just add a new verb to be used by Engine/vdsClient/whatever.
>    Tuning log levels is not more dangerous than a truckload of verbs we
>    already
>    expose

vdsClient -s 0 setLogLevel 20

> 
> 3. build on the manhole integration (https://gerrit.ovirt.org/#/c/32147/).
> 
> 4. use signals (SIGUSR? SIGHUP?)
> 
> Thoughts welcome
> 
> --
> Francesco Romani
> RedHat Engineering Virtualization R & D
> Phone: 8261328
> IRC: fromani
> _______________________________________________
> Devel mailing list
> Devel at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/devel
>