Hi Pete, On Wed, Jul 22, 2015 at 05:42:15PM -0500, Pete Travis wrote: > > 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`. Thank you for this clear and very nice explanation. > 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. I think this is where things go wrong. OnBootSec handles powerdowns, what about intermittent connections? In principle, it is quite possible everytime the timer triggers the makecache service, the connection is absent. In fact, the probability to hit the sweet spot is directly determined by the reliability of the connection. So a connection that is up 50% of the time, will miss 50% of the makecache jobs. Maybe the makecache jobs can reset the timer to try again in 10 mins in case of no network connectivity. I think that would make the odds more favourable. Essentially I'm suggesting to treat no connectivity as a powercycle. Hopefully this gives the devs some ideas. Cheers, -- Suvayu Open source is the future. It sets us free. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
