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<p>The attached systemd unit file from the rpmfusion packages for Fedora have plenty of hints on what to do for various issues.</p>
<p>On 2017-11-02 09:15, Mark van Dijk wrote:</p>
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<div dir="ltr">---------- Forwarded message ----------<br />From: Stephen Worthington <<a href="mailto:stephen_agent@jsw.gen.nz">stephen_agent@jsw.gen.nz</a>><br />To: MythTV in NZ <<a href="mailto:mythtvnz@lists.ourshack.com">mythtvnz@lists.ourshack.com</a>><br />Cc: <br />Bcc: <br />Date: Wed, 01 Nov 2017 13:29:21 +1300<br />Subject: Re: [mythtvnz] MythTV 0.29 and HDHomeRun<br />On Wed, 1 Nov 2017 11:15:31 +1300, you wrote:<br />
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<p class="MsoNormal" style="margin-bottom: 12pt;"><span style="color: #404040;">></span>If you set up MythTV to use the external IP address of the PC (as you<br /> <span style="color: #404040;">></span>do if you are using external frontends), then in v29 that problem<br /> <span style="color: #404040;">></span>should go away. I suspect that you are just using localhost<br /> <span style="color: #404040;">></span>(127.0.0.1) to connect to the backend, and the localhost interface<br /> <span style="color: #404040;">></span>comes up virtually instantly compared to the real interfaces like<br /> <span style="color: #404040;">></span>Ethernet cards. In 0.28 and before, if you used the external address<br /> <span style="color: #404040;">></span>of the PC, then mythbackend could come up before it was ready and<br /> <span style="color: #404040;">></span>would decided to drop back to using localhost. In v29 that should<br /> <span style="color: #404040;">></span>have been fixed and it will wait quite a long time for the specified<br /> <span style="color: #404040;">></span>IP address to become available to bind to.<br /> <span style="color: #404040;">></span><br /> <span style="color: #404040;">></span>In 0.28 and before, the normal fix on Ubuntu with systemd was to<br /> <span style="color: #404040;">></span>create a systemd override file for mythtv-backend.service to make it<br /> <span style="color: #404040;">></span>wait for NetworkManager to be running. NetworkManager normally only<br /> <span style="color: #404040;">></span>signals it is running after the Ethernet interfaces are up. There are<br /> <span style="color: #404040;">></span>threads on the mythtv-users mailing list that tell you how to do that<br /> <span style="color: #404040;">></span>- it is a bit involved. But try just changing to using the external<br /> <span style="color: #404040;">></span>IP address of the box first.<br /> <span style="color: #404040;">></span><br /> <span style="color: #404040;">></span>If mythbackend ever comes up before a tuner is ready, then it will<br /> <span style="color: #404040;">></span>mark the tuner as unavailable and will not use it. So if you have<br /> <span style="color: #404040;">></span>tuners that are slow to come up, it can be a good idea to have a<br /> <span style="color: #404040;">></span>systemd override file for mythtv-backend.service that tells it to wait<br /> <span style="color: #404040;">></span>for those tuners before starting mythbackend. I do not know of any<br /> <span style="color: #404040;">></span>way to do that with HDHomerun tuners, so you will need to make sure<br /> <span style="color: #404040;">></span>they are on and fully up before mythbackend gets started. For<br /> <span style="color: #404040;">></span>internal tuners, you create a /etc/udev/rules.d/99-tuner.rules file<br /> <span style="color: #404040;">></span>containing this:<br /> <span style="color: #404040;">></span><br /> <span style="color: #404040;">></span>#<br /> <span style="color: #404040;">></span># Create systemd device units for capture devices<br /> <span style="color: #404040;">></span>#<br /> <span style="color: #404040;">></span>SUBSYSTEM=="video4linux", TAG+="systemd"<br /> <span style="color: #404040;">></span>SUBSYSTEM=="dvb", TAG+="systemd"<br /> <span style="color: #404040;">></span>SUBSYSTEM=="firewire", TAG+="systemd"<br /> <span style="color: #404040;">></span><br /> <span style="color: #404040;">></span>and then in your systemd override file you put things like this in the<br /> <span style="color: #404040;">></span>[Unit] section:<br /> <span style="color: #404040;">></span><br /> <span style="color: #404040;">></span>Wants=dev-dvb-adapter0-frontend0.device<br /> <span style="color: #404040;">></span>After=dev-dvb-adapter0-frontend0.device<br /> <span style="color: #404040;">></span>Wants=dev-dvb-adapter1-frontend0.device<br /> <span style="color: #404040;">></span>After=dev-dvb-adapter1-frontend0.device<br /> <span style="color: #404040;">></span><br /> <span style="color: #404040;">></span>A Wants line tells systemd that this unit wants that other unit<br /> <span style="color: #404040;">></span>started. An After line tells systemd to wait until that other unit<br /> <span style="color: #404040;">></span>signals it is started before starting this unit.<br /> <br /> <span style="color: #404040;">Thanks very much Stephen! This is really useful. I have now verified (via mythbackend.log and kern.log) that the mythbackend is definitely trying to connect to the HDHomeRun before the eth0 interface is ready. </span><span></span></p>
<p class="MsoNormal"><span style="color: #404040;">As you suggest, I changed the IP address in my MythBackend setup to point to the real IP address rather than 127.0.0.1. I had to modify the MYSQL config file to bind to 0.0.0.0 rather than 127.0.0.1 so that the backend could actually connect. Unfortunate there was no change – the issue persists and the backend is still trying to connect to the HDHomeRun before the network is up.<span></span></span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: Arial,sans-serif; color: #404040;"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: Arial,sans-serif; color: #404040;">I shall have a hunt around online to see how I can delay the mythbackend via systemmd.<span></span></span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: Arial,sans-serif; color: #404040;"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: Arial,sans-serif; color: #404040;">Cheers<span></span></span></p>
<div class="gmail_extra">Mark<br />
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