On Wed, Jul 22, 2015 at 5:22 PM, Suvayu Ali <fatkasuvayu+li...@gmail.com> wrote:
> On Wed, Jul 22, 2015 at 07:20:11PM +0100, Ron Yorston wrote: > > Suvayu Ali wrote: > > >That said, I sometimes do not understand what's the harm in getting > > >updates few hours later. dnf already tells you how old the metadata is > > >when it starts, you can choose to get the latest metadata if it is too > > >old. So what's the big deal? > > > > I certainly get the impression that dnf tells me about updates less > > frequently than yum did. It also seems to pull in metadata less > > frequently. > > Everyone seems to picked on this post for me, whereas missing on my > follow-up, with actual numbers: > > <http://mid.gmane.org/20150722160112.gc1...@chitra.no-ip.org> > > > In fedora-updates.repo I have: metadata_expire=6h. I also have the > > dnf-makecache.timer 'masked'. > > In the above post, I say I do not change any of the defaults metadata > related configs. From what people are posting, I have the feeling dnf > relies a lot on _continuous_ network connectivity (which is true in my > case). If that is true, if either the connection at the users end is > intermittent, or the mirrors are unreliable, the cache probably ends up > being stale more often. > > Instead of bashing and complaining, I think trying to analyse why it > works for me (and maybe a few others who are quiet), and not for the > other participants in this thread, it would be a lot more helpful to the > devs. I can't help here since it actually works for me beautifully. > Users who see a problem are the ones in a position to contribute an > effective bug report. > > My 2ยข, cheers, > > -- > Suvayu There is a timer unit, `/usr/lib/systemd/system/dnf-makecache.timer`, that fires ten minutes after each boot then one hour following the execution of each previous run. It triggers `/usr/lib/systemd/system/dnf-makecache.service`, a service that executes `dnf -v makecache timer`. When that command runs, dnf will check the age of the current metadata cache and refresh it if it is older than the value of * metadata_timer_sync* (seconds) in `/etc/dnf/dnf.conf`. So, an always-on computer should never have metadata older than 4 hours; in practical terms, I think values >2 hours are increasingly unlikely. A computer that's been off overnight and turned on in the morning should have a fresh cache within 15 minutes of boot. If you have, say, a laptop that you power down often and often install or update packages immediately after boot, you might adjust the OnBootSec value by copying dnf-makecache.timer to /etc/systemd/system/ and editing accordingly. Or, consider appending --refresh on an as-needed basis. -- Pete
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