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Re: Script vs command line behaviour

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Le duodi 22 vendémiaire, an CCXXV, Mark Fletcher a écrit :
> You bring up a good point, actually. I'm calling systemctl stop and 
> systemctl start to stop and start mysql -- and I'm doing that in a 
> script that is itself being called by a systemd unit (the one triggered 
> by the timer). I wonder if that is in some way naughty and contributing 
> to the problem? Hmmm, is there a better way to ensure these services are 
> stopped before the backup starts and started again afterwards?

This is exactly the correct way of proceeding: with systemctl start, you are
not directly starting the service (like you did with /etc/init.d/something
start, with all the drawbacks it implies, like user environment bleeding
into the service); instead, you are sending a message to systemd to tell it
to start the service.

From your point of view, it does not change anything, but as a design, it is
much cleaner.

> Although that said, MySQL and SVNServe (which are started by systemd) go 
> down and come back up fine, it is the one that ISN'T currently 
> controlled by systemd that I am having problems with.

It IS controlled by systemd, everything is. But you neglected to inform
systemd there was something special about it.

You can debug what happens to your script by adding this line near the
beginning:

strace -f -e execve -s 10000 -o /tmp/my_script.$$.$(date +%Y%m%d%H%M%S) &

Tomorrow, the file in /tmp will tell you what happened.

Note that the idea of the stale PID file is worth checking still.

Regards,

-- 
  Nicolas George

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Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-12 14:40 +0200
  Re: Script vs command line behaviour Greg Wooledge <wooledg@eeg.ccf.org> - 2016-10-12 14:50 +0200
    Re: Script vs command line behaviour Frédéric Marchal <frederic.marchal@wowtechnology.com> - 2016-10-12 15:30 +0200
    Re: Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-12 15:50 +0200
      Re: Script vs command line behaviour Greg Wooledge <wooledg@eeg.ccf.org> - 2016-10-12 16:00 +0200
        Re: Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-12 16:20 +0200
          Re: Script vs command line behaviour Nicolas George <george@nsup.org> - 2016-10-12 16:30 +0200
            Re: Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-12 17:10 +0200
              Re: Script vs command line behaviour Darac Marjal <mailinglist@darac.org.uk> - 2016-10-12 17:20 +0200
              Re: Script vs command line behaviour Nicolas George <george@nsup.org> - 2016-10-12 17:20 +0200
                Re: Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-13 16:50 +0200
                Re: Script vs command line behaviour Nicolas George <george@nsup.org> - 2016-10-13 17:00 +0200
                Re: Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-14 01:10 +0200
            Re: Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-13 01:30 +0200
              Re: Script vs command line behaviour Henrique de Moraes Holschuh <hmh@debian.org> - 2016-10-14 02:50 +0200
      Re: Script vs command line behaviour Gene Heskett <gheskett@shentel.net> - 2016-10-12 16:40 +0200
        Re: Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-12 17:20 +0200
          Re: Script vs command line behaviour Frank <zuiderduin@gmx.com> - 2016-10-12 18:00 +0200
            Re: Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-13 01:20 +0200
    Re: Script vs command line behaviour Andre Majorel <aym-naibed@teaser.fr> - 2016-10-15 11:50 +0200
      Re: Script vs command line behaviour Henrique de Moraes Holschuh <hmh@debian.org> - 2016-10-15 15:50 +0200
  Re: Script vs command line behaviour Jude DaShiell <jdashiel@panix.com> - 2016-10-12 23:00 +0200
    Re: Script vs command line behaviour Mark Fletcher <mark27q1@gmail.com> - 2016-10-13 01:00 +0200

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