snapd

  1. Bug #1854694
  2. Comment #3

Comment 3 for bug 1854694

Revision history for this message
Robert Liu (robertliu) wrote : Re: Watchdog settings aren't applied immediately

Hi Pawel,

I've checked both systemd and snapd. Here are my findings, but I'm not sure if I missed something.
1. systemd will notify the hardware watchdog if we set the "RuntimeWatchdogSec"[1]
2. Systemd parses the .service file of snapd and pass the value through the WATCHDOG_USEC env variable. By default, the value is 5 minutes. Systemd will restart snapd, if snapd doesn't update the software watchdog within the period.

So, I think it's should be fine that using "systemctl daemon-reexec" to apply the watchdog settings immediately after updating.

[1] https://git.launchpad.net/ubuntu/+source/systemd/tree/src/core/manager.c?h=ubuntu/xenial-updates#n2019