System Time

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It's nice if the clock is more-or-less right before services start.

bind/named resolver doesn't resolve if the clock is horribly out
(DNSSEC?) and it doesn't fix itself after a systemctl restart chronyd,
you need to actually bounce named.  Without named things like
'ntp.pool.fedora' don't work, so there's a catch-22.

postgresql can be unhappy on boot.  This is clock related, but I can't
replicate it 100% yet.

journald will rotate logs as soon as chronyd syncs the clock.  So any
logs from bootup (1970) are lost.  That's another reason to get the
clock +- correct as soon as possible.


I'm currently using a cron script to touch a file every 10 minutes, and
read that on bootup (before chronyd), and I've added a
'Requires=touchClock' to some systemd services.

The script is smart enough to refuse to run if it'll move the time
backwards.
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