[systemd-devel] My experience with MySQL and systemctl

[Lennart Poettering]

On Wed, 12.04.17 21:09, Michael Biebl (mbiebl at gmail.com) wrote:

> 2017-04-12 20:24 GMT+02:00 Tomasz Torcz <tomek at pipebreaker.pl>:
> > On Wed, Apr 12, 2017 at 11:01:04AM -0700, Auke Kok wrote:
> >> The right (or, better) solution IMHO would be for mysqld to signal to
> >> systemd that it's running OK before recovery starts, using type=notify.
> >> This way recovery can take as long as needed, and if it fails, it could
> >> signal this failure as normal back to systemd. Then systemd would retry
> >> the recovery a few times this way and finally give up.
> >
> >   It wouldn't be good solution.  READY=1 means clients can connect and
> > talk to the database. Signalling readiness prematurely would break functionality..
> 
> Maybe we'd need a new state paramenter, like STARTING=1 which could be
> sent by the daemon to systemd in regular intervals and would signal
> systemd that the startup of the daemon is in process and the daemon is
> not actually hung.

There was an RFE somewhere for supporting watchdog messages
(i.e. WATCHDOG=1) during startup too, not just during runtime. I'd be
fine with adding that.

Lennart

-- 
Lennart Poettering, Red Hat