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Stop Mythbackend
http://forums.linhes.org/viewtopic.php?f=25&t=22731		 Page 1 of 1
Author:  sparks [ Sat Aug 25, 2012 9:46 am ]
Post subject:  Stop Mythbackend
This question also applies to most any daemon since I have run into the problem with mythexport and mysql too. Simply put, how do i shut down a service in LinHES? At times when I am trying to do various maintenance work I would like the backend shutdown. I have tried:

sudo sv stop mythbackend
sudo sv exit mythbackend
sudo sv force-stop mythbackend

I get something like
ok: down: mythbackend: 80s, normally up
which doesn't mean a whole to me. A check of running processes show the backend still running. If I issue a kill command, the service stops but is back up and running very shortly which is, I guess, the whole point of runsv. So my experience is good when I want something to keep running and bad if if I want to stop it. How do I administrate services?

s
Author:  nbdwt73 [ Sat Aug 25, 2012 11:27 am ]
Post subject:  Re: Stop Mythbackend
alt-2 = stop backend
alt-1 = start backend
alt-3 = restart backend
Author:  sparks [ Sat Aug 25, 2012 11:49 am ]
Post subject:  Re: Stop Mythbackend
1) This doesn't address how to deal with other services

2) Alt+2 has the same effect as working from the command line. I could see the stop command running in the list of processes but the backend is still kept running. :cry:

I guess I should mention that this is a stock install of 7.4. I haven't made any changes except for copying non-system files (recordings, files to the home directory, etc). I have had this problem since the switch was made to the archlinux platform. I switch to mythbuntu about 15 months ago but decided to try LinHES again. Now that I am back, I thought it was time to get to the bottom of this.
Author:  brfransen [ Sat Aug 25, 2012 12:08 pm ]
Post subject:  Re: Stop Mythbackend
sudo sv stop mythbackend is exactly what Alt-2 does. Here is an output using pidof to show if mythbackend is running:
Code:
[mythtv@mythtv ~]$ pidof mythbackend
19915
[mythtv@mythtv ~]$ sudo sv stop mythbackend
ok: down: mythbackend: 0s, normally up
[mythtv@mythtv ~]$ pidof mythbackend
[mythtv@mythtv ~]$ sudo sv start mythbackend
ok: run: mythbackend: (pid 20047) 0s
[mythtv@mythtv ~]$ pidof mythbackend
20091


What does ps aux | grep mythbackend show before and after sudo sv stop mythbackend?
Author:  sparks [ Sat Aug 25, 2012 1:11 pm ]
Post subject:  Re: Stop Mythbackend
It shows the backend running with the same pid before and after the command. If I issue a kill command the after shows the backend running but with, of course, a different pid.

I will add that I see nothing in the logs except that I ran the command using sudo. Nothing about the disposition of the execution failing or succeeding.

s
Author:  sparks [ Sat Aug 25, 2012 1:23 pm ]
Post subject:  Re: Stop Mythbackend
Maybe I've got this all wrong. If I do a ps ax | grep mythback I get a line that says runsv mythbackend is running. I thought this was the backend process but now I think that it is the runsv supervisor running and it's handling the backend service whether it is up or down. IOW, I would see a separate process for the backend when it is actually running. Is this true?

s
Author:  brfransen [ Sat Aug 25, 2012 2:00 pm ]
Post subject:  Re: Stop Mythbackend
That is correct, runsv should always be running. That is why I did a pidof mythbackend specifically.

With mythbackend running:
Code:
[mythtv@mythtv ~]$ ps aux | grep mythbackend
root      1182  0.0  0.0   1632   316 ?        Ss   05:45   0:00 runsv mythbackend
root     20047  0.0  0.0   4120   980 ?        S    13:22   0:00 su mythtv -c /usr/bin/mythbackend -q --syslog local6
mythtv   20091  0.4  2.9 458540 60760 ?        Sl   13:22   0:31 /usr/bin/mythbackend -q --syslog local6
mythtv   26371  0.0  0.0   4064   828 pts/2    S+   15:15   0:00 grep mythbackend
The mythbackend is pid 20091.

With mythbackend stopped:
Code:
[mythtv@mythtv ~]$ ps aux | grep mythbackend
root      1182  0.0  0.0   1632   316 ?        Ss   05:45   0:00 runsv mythbackend
mythtv   26499  0.0  0.0   4064   824 pts/2    S+   15:18   0:00 grep mythbackend
Author:  sparks [ Sat Aug 25, 2012 5:01 pm ]
Post subject:  Re: Stop Mythbackend
Thanks for setting me straight. Sometimes I problems with the simplest things. <*sigh*>

s
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