Re: [PATCH] Do not keep empty log files for deleted domains

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On Wed, Jul 03, 2019 at 03:26:36PM +0000, Jim Fehlig wrote:
> On 7/3/19 2:42 AM, Daniel P. Berrangé  wrote:
> > On Wed, Jul 03, 2019 at 08:55:15AM +0200, Peter Krempa wrote:
> >> On Wed, Jul 03, 2019 at 08:32:21 +0200, Jan Zerebecki wrote:
> >>> On 03/07/2019 08.03, Peter Krempa wrote:
> >>>> I'm not sure that this is the right thing to do. virtlogd has some
> >>>> internal log rotation mechanisms
> >>>
> >>> logrotate is already in use here and this patch doesn't change what is
> >>> rotated nor how often it is rotated.
> >>>
> >>>> and also the SIGUSR1 action is reserved
> >>>> for re-exec updates and not for dealing with modified files
> >>>
> >>> The mechanism (re-exec) and implementation details for both uses do not
> >>> conflict.
> >>
> >> The problem is that the logrotate configs predate use of virtlogd and I
> >> don't think they were adapted to be used together. In fact if I remember
> >> correctly the idea of virtlogd was to avoid using logrotate altogether.
> > 
> > Yes, logrotate should not be in effect when virtlogd is running. We should
> > ensure that logrotate rollover size is *larger* than the rollover size
> > configured for virtlogd. This would ensure virtlogd rolls over first, and
> > thus when logrotate runs it should see nothing todo.
> 
> Hmm, it sounds like the proper fix is to simply remove
> src/remote/libvirtd.qemu.logrotate.in?

We didn't want to remove it because whether or not to use virtlogd is
a config file tunable. Hence we want to make sure that its default
settings end up being a no-op if virtlogd has already done its own
rollover

Regards,
Daniel
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