[mythtv-users] One step forward, two steps back - Frontends not woring properly

Fri Apr 29 22:09:59 UTC 2016

On Fri, Apr 29, 2016 at 2:55 PM Damian Surr <damian at surr.co.uk> wrote:

> On 29/04/2016 22:31, Damian wrote:
> > I LOVE MythTV when it's all set up and working properly.
> >
> > Is there anything more frustrating when it's not??
> >
> > OK, here's the latest problem. (all using Xubuntu 16.04, MythTV 0.28,
> > via Mythbuntu, all updates to latest versions etc).
> >
> > Things were going well. Server all set up. Backend working well. Local
> > frontend (on the server) seeming to work fine.
> >
> > One remote frontend set up and seeming fine.
> >
> > Second (main) remote frontend setup, but just wouldn't connect to the
> > backend! I couldn't work it out. Everything seemed fine, but it
> > couldn't connect.
> >
> > In desperation (never a good place to make decisions), I thought about
> > how Mythbuntu seems to install a slave backend (which I had removed on
> > the frontends) by default. So, I installed and set up slave backends
> > on both of the remote frontend machines.
> >
> > This seemed to work well. Now both remote frontends could connect and
> > I thought that I was heading in the right direction. However, now the
> > frontends were suddenly SO SLOW and couldn't connect to 'Videos' or
> > watch TV.
> >
> > After failing to fix this, I thought that the slave backends may have
> > been the problem, so I uninstalled them from both of the remote
> > frontends.
> >
> > This didn't change anything. I could still connect (so I was further
> > on than before I affed the slave backends), but everything was still
> > unusable.
> >
> > I tried changing the <LocalHostName> on one of the frontends to see if
> > being effectively a 'new user' would clean things up. It didn't. I was
> > just a new user with a system that was still broken.
> >
> > I ran one of the remote frontends from the command line to see what
> > error messages I was getting while things were freezing, and I got
> > lots of copies of messages like this ...
> >
> > 2016-04-29 21:49:14.102196 I MythCoreContext::ConnectCommandSocket():
> > Connecting to backend server: 192.168.0.2:6543 (try 1 of 1)
> > 2016-04-29 21:49:21.121452 E  MythSocket(3b91410:68): ReadStringList:
> > Error, timed out after 7000 ms.
> > 2016-04-29 21:49:21.121843 C  Protocol version check failure.
> >             The response to MYTH_PROTO_VERSION was empty.
> >             This happens when the backend is too busy to respond,
> >             or has deadlocked due to bugs or hardware failure.
> > 2016-04-29 21:49:21.122406 W  Backend : gingerserver currently
> > Unreachable. Skipping this one.
> > 2016-04-29 21:49:21.122558 I MythCoreContext::ConnectCommandSocket():
> > Connecting to backend server: 192.168.0.2:6543
> >
> > I've just gone back to the server (backend system) and run the
> > frontend on there. Now that's having the same trouble. Almost
> > completely unresponsive. I haven't even touch this machine while I've
> > been trying other stuff!
> >
> > $ sudo service mythtv-backend status
> >
> > returns ...
> >
> > ● mythtv-backend.service - MythTV Backend
> >    Loaded: loaded (/lib/systemd/system/mythtv-backend.service;
> > enabled; vendor preset: enabled)
> >    Active: active (running) since Fri 2016-04-29 20:34:26 BST; 1h
> > 53min ago
> >      Docs: https://www.mythtv.org/wiki/Mythbackend
> >  Main PID: 822 (mythbackend)
> >     Tasks: 34 (limit: 512)
> >    CGroup: /system.slice/mythtv-backend.service
> >            └─822 /usr/bin/mythbackend --quiet --syslog local7
> >
> > Apr 29 21:45:05 gingerserver mythbackend[822]: mythbackend[822]: I
> > TVRecEvent tv_rec.cpp:3685 (TuningFrequency) TVRec[3]: TuningFrequency
> > Apr 29 21:50:18 gingerserver mythbackend[822]: mythbackend[822]: I
> > TVRecEvent tv_rec.cpp:3685 (TuningFrequency) TVRec[3]: TuningFrequency
> > Apr 29 21:55:31 gingerserver mythbackend[822]: mythbackend[822]: I
> > TVRecEvent tv_rec.cpp:3685 (TuningFrequency) TVRec[3]: TuningFrequency
> > Apr 29 22:00:43 gingerserver mythbackend[822]: mythbackend[822]: I
> > TVRecEvent tv_rec.cpp:3685 (TuningFrequency) TVRec[3]: TuningFrequency
> > Apr 29 22:05:55 gingerserver mythbackend[822]: mythbackend[822]: I
> > TVRecEvent tv_rec.cpp:3685 (TuningFrequency) TVRec[3]: TuningFrequency
> > Apr 29 22:11:08 gingerserver mythbackend[822]: mythbackend[822]: I
> > TVRecEvent tv_rec.cpp:3685 (TuningFrequency) TVRec[3]: TuningFrequency
> > Apr 29 22:11:11 gingerserver mythbackend[822]: mythbackend[822]: E
> > TVRecEvent tv_rec.cpp:3964 (TuningSignalCheck) TVRec[3]:
> > TuningSignalCheck: SignalMonitor timed out
> > Apr 29 22:14:14 gingerserver mythbackend[822]: mythbackend[822]: I
> > TVRecEvent tv_rec.cpp:3685 (TuningFrequency) TVRec[3]: TuningFrequency
> > Apr 29 22:19:20 gingerserver mythbackend[822]: mythbackend[822]: I
> > TVRecEvent tv_rec.cpp:3685 (TuningFrequency) TVRec[3]: TuningFrequency
> > Apr 29 22:24:25 gingerserver mythbackend[822]: mythbackend[822]: I
> > TVRecEvent tv_rec.cpp:3685 (TuningFrequency) TVRec[3]: TuningFrequency
> >
> > Any ideas?
> >
> > I had some mysql problems earlier, which I posted about, but they seem
> > to be resolved now. I can connect with both root and mythtv.
> >
> > My daughter is supposed to be having a cinema party fro her 16th
> > birthday on Wednesday. If I don't get this sorted, I'm 'bad dad', big
> > time. :-)
> >
> > Please let me know if you can see what's wrong or know what I should
> > do next.
> >
> > Thanks,
> > Damian
> Brief success, then back to failure.
>
> Looking at the backend setup, I saw that I'd set the IPv6 address back
> to "::1". This must have been when I was trying and failing to get the
> second remote frontend to connect. I don't really know what that big
> long IPv6 address is (the one that's selectable on the backend), but
> must have assumed at some point that it should be moved away from the
> default value just as the IPv4 address needs to be changed.
>
> Looking at https://www.mythtv.org/wiki/Setup_General indicates that I
> should have left this at the default value "::1", and I must have
> changed that earlier.
>
> I just changed it back to the long IPv6 address, and suddenly everything
> was great, for about 3 minutes. All frontends connected fine, were
> responsive, and things looked good.
>
> Then it all turned to sludge again.
>
> Does this point to the source of the problem?
>
> Thanks,
> Damian
>
>
On your backend, is mysql listening on the right addresses?
-- 
Thomas Mashos
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