[mythtv-users] Fedora, ceton, systemd, and mythbackend

[Gary Buhrmaster]

On Mon, Jan 26, 2015 at 3:18 AM, Rich Freeman
<r-mythtv at thefreemanclan.net> wrote:
.....
> Your network management software (not systemd, unless systemd-networkd
> IS your network management software) decides when
> network-online.target is reached.  That might be configurable.

Some distros provide a "systemd-networkd-wait-online" and/or a
"NetworkManager-wait-online" service which, if enabled, enforce
some dependencies.  Your distro (and systemd release) will vary.

> The other issue I was struggling with was poor dependencies in
> mythbackend units, and the poor design of the mysql units in use in
> most places.  Often mythbackend would fail due to mysql not being up.

I recall seeing a discussion where mysql (mariadb) is marked
ready before it listens on some sockets.  This was generally
agreed to be a mysql issue, but various hacks (such as yours)
were proposed until a longer term fix was integrated.  Since
mariadb (in latest Fedora, have not checked legacy releases)
use type=simple, changing that to be type=notify and a
sd_notify(0, "READY=1") call at the appropriate place
in the mariadb code path (when sockets have been opened)
might be a better (long term) fix.  I have not followed the
mariadb dev lists to know if such fixes are already in place.