[mythtv-users] Brand new install - Mythbackend doesn't start

Ashu Desai ashu.desai at gmail.com
Wed Aug 2 13:44:23 UTC 2017


On Wed, Aug 2, 2017 at 5:48 AM, Mike Perkins <mikep at randomtraveller.org.uk>
wrote:

> On 02/08/17 08:25, Stephen Worthington wrote:
>
>> On Wed, 2 Aug 2017 01:03:17 -0500, you wrote:
>>
>> On Tue, Aug 1, 2017 at 11:10 PM, Mark Perkins <perkins1724 at hotmail.com>
>>> wrote:
>>>
>>> On 2 August 2017 1:17:13 pm Ashu Desai <ashu.desai at gmail.com> wrote:
>>>>
>>>> On Tue, Aug 1, 2017 at 8:45 PM, Hika van den Hoven <hikavdh at gmail.com>
>>>>> wrote:
>>>>>
>>>>> Did you check on mysql/mariadb responding to the external ip (check
>>>>>> the wiki on how to do this.
>>>>>>
>>>>>> The frontend/backend are on the same box - and there isn't any
>>>>>> external
>>>>>>
>>>>> IP. i am testing everything all from home network.
>>>>> Here's what I did find though:
>>>>>
>>>>> ---------------
>>>>> Aug  1 22:27:32 mythmaster systemd: Started MythTV backend service.
>>>>> Aug  1 22:27:32 mythmaster systemd: Starting MythTV backend service...
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.824647 C
>>>>>  mythbackend version: fixes/0.28 [v28.0-35-g812ec08] www.mythtv.org
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.824669 C
>>>>> Qt
>>>>> version: compile: 5.6.1, runtime: 5.6.1
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.824671 N
>>>>>  Enabled verbose msgs:  general
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.824938 N
>>>>>  Setting Log Level to LOG_INFO
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.837289 I
>>>>>
>>>> Added
>>>>
>>>>> logging to the console
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838125 I
>>>>>
>>>> Setup
>>>>
>>>>> Interrupt handler
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838131 I
>>>>>
>>>> Setup
>>>>
>>>>> Terminated handler
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838136 I
>>>>>
>>>> Setup
>>>>
>>>>> Segmentation fault handler
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838138 I
>>>>>
>>>> Setup
>>>>
>>>>> Aborted handler
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838142 I
>>>>>
>>>> Setup
>>>>
>>>>> Bus error handler
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838150 I
>>>>>
>>>> Setup
>>>>
>>>>> Floating point exception handler
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838152 I
>>>>>
>>>> Setup
>>>>
>>>>> Illegal instruction handler
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838160 I
>>>>>
>>>> Setup
>>>>
>>>>> Real-time signal 0 handler
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838165 I
>>>>>
>>>> Setup
>>>>
>>>>> Hangup handler
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838198 N
>>>>>
>>>> Read
>>>>
>>>>> conf dir = /etc/mythtv
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838229 N
>>>>>
>>>> Using
>>>>
>>>>> runtime prefix = /usr
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838231 N
>>>>>
>>>> Using
>>>>
>>>>> configuration directory = /etc/mythtv
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838288 I
>>>>>  Assumed character encoding: en_US.UTF-8
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838604 E
>>>>>
>>>> Error
>>>>
>>>>> parsing: /etc/mythtv/config.xml at line: 1  column: 1
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838607 E
>>>>>
>>>> Error
>>>>
>>>>> Msg: unexpected end of file
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838666 E
>>>>>  DBHostName is not set in config.xml
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838674 E
>>>>>  DBHostName is not set in config.xml
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838687 N
>>>>>
>>>> Empty
>>>>
>>>>> LocalHostName.
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.838693 I
>>>>>
>>>> Using
>>>>
>>>>> localhost value of mythmaster.localdomain
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.848276 N
>>>>>  Setting QT default locale to en_US
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.848287 I
>>>>>  Current locale en_US
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.848497 N
>>>>>  Reading locale defaults from /usr/share/mythtv//locales/en_us.xml
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.852404 I
>>>>>  Loading en_us translation for module mythfrontend
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.858057 I
>>>>>  Current MythTV Schema Version (DBSchemaVer): 1344
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.858296 I
>>>>>  Loading en_us translation for module mythfrontend
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.860040 N
>>>>>  MythBackend: Starting up as the master server.
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.860795 W
>>>>>  MythBackend: No valid capture cards are defined in the database.
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.861100 E
>>>>>  Scheduler: No capture cards are defined in the database.
>>>>> Aug  1 22:27:32 mythmaster mythbackend: Perhaps you should re-read the
>>>>> installation instructions?
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.861186 E
>>>>>
>>>> Error
>>>>
>>>>> parsing: /etc/mythtv/config.xml at line: 1  column: 1
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.861188 E
>>>>>
>>>> Error
>>>>
>>>>> Msg: unexpected end of file
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.940295 I
>>>>>
>>>> Added
>>>>
>>>>> logging to /var/log/mythtv/mythbackend.20170802032732.23638.log
>>>>> Aug  1 22:27:32 mythmaster mythbackend: 2017-08-01 22:27:32.945104 I
>>>>>  Removed logging to /var/log/mythtv/mythbackend.20
>>>>> 170802032732.23638.log
>>>>> Aug  1 22:27:32 mythmaster systemd: mythbackend.service: main process
>>>>> exited, code=exited, status=1/FAILURE
>>>>> Aug  1 22:27:32 mythmaster systemd: Unit mythbackend.service entered
>>>>>
>>>> failed
>>>>
>>>>> state.
>>>>> Aug  1 22:27:32 mythmaster systemd: mythbackend.service failed.
>>>>>
>>>>> --------------
>>>>>
>>>>> I am running this as root - so i thought the dir should show
>>>>>
>>>> /root/.mythtv/
>>>>
>>>>> Looking at the dir, there is no "config.xml" under /etc/mythtv
>>>>>
>>>>> Maybe because I never ran this as anything but root?
>>>>>
>>>>>
>>>>> [root at mythmaster ~]# ls -ahl /etc/mythtv/
>>>>> total 32K
>>>>> drwxr-xr-x.   6 mythtv mythtv 4.0K Aug  1 22:27 .
>>>>> drwxr-xr-x. 140 root   root    12K Aug  1 22:23 ..
>>>>> drwxr-xr-x.   2 mythtv mythtv 4.0K Aug  1 20:00 3rdParty
>>>>> drwxr-xr-x.   2 mythtv mythtv 4.0K Aug  1 20:00 channels
>>>>> -rw-r--r--.   1 mythtv mythtv    0 Aug  1 22:27 config.xml
>>>>> drwxr-xr-x.   2 mythtv mythtv 4.0K Aug  1 20:00 themes
>>>>> drwxr-xr-x.   3 mythtv mythtv 4.0K Aug  1 20:00 tmp
>>>>>
>>>>> I looked into the config file - it was empty. So i created a link (ln
>>>>> -s)
>>>>> from /root/.mythtv/config.xml to /etc/mythtv
>>>>>
>>>>> That didn't work either.
>>>>>
>>>>>
>>>>> Also, try to bottom post, this to keep the thread readable for future
>>>>>> readers. Check the etiquettes.
>>>>>>
>>>>>>
>>>>>> Apologies.
>>>>>
>>>>> _______________________________________________
>>>>>> mythtv-users mailing list
>>>>>> mythtv-users at mythtv.org
>>>>>> http://lists.mythtv.org/mailman/listinfo/mythtv-users
>>>>>> http://wiki.mythtv.org/Mailing_List_etiquette
>>>>>> MythTV Forums: https://forum.mythtv.org
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> ----------
>>>>> _______________________________________________
>>>>> mythtv-users mailing list
>>>>> mythtv-users at mythtv.org
>>>>> http://lists.mythtv.org/mailman/listinfo/mythtv-users
>>>>> http://wiki.mythtv.org/Mailing_List_etiquette
>>>>> MythTV Forums: https://forum.mythtv.org
>>>>>
>>>>>
>>>> Are you sure the BE is running as root? Are you using systemd? What is
>>>> in
>>>> your service file?
>>>>
>>>>
>>> Sorry - sent email to Mark by accident:
>>>
>>> Systemd? Yes
>>>
>>> [root at mythmaster ~]# pstree -p | grep system
>>> systemd(1)-+-ModemManager(578)-+-{ModemManager}(604)
>>>           |-systemd-journal(366)
>>>           |-systemd-logind(584)
>>>           |-systemd-udevd(397)
>>>
>>>
>>> Not sure how to find out if BE is running as root. If you mean under the
>>> mythbackend.service file - ( vi /usr/lib/systemd/system/mythba
>>> ckend.service)
>>> -- then I tried both here:
>>> # systemd changes execution from the calling user (possibly root) to this
>>> user
>>> # if you have permissions problems or obscure errors try logging in as
>>> mythtv
>>> User=mythtv
>>> #User=root
>>>
>>> I had commented out "user=mythtv" and put root instead - but that didn't
>>> change anything.
>>>
>>> What's in it - what was default i believe:
>>>
>>> [Unit]
>>> Description=MythTV backend service
>>> After=network-online.target mariadb.service mysqld.service
>>> time-sync.target
>>> # Uncomment the following line if you will be using the mythweb plugin on
>>> the
>>> # same system as mythbackend.
>>> #Wants=httpd.service
>>>
>>> [Service]
>>> # Type=simple is recommended. If using Type=forking you will need to
>>> specify a
>>> # pidfile so systemd knows how to find the forked process PID, otherwise
>>> it
>>> # presumes that the process being started will be the remaining process.
>>> #Type=forking
>>> Type=simple
>>> Environment=MYTHCONFDIR=/etc/mythtv
>>>
>>> # systemd changes execution from the calling user (possibly root) to this
>>> user
>>> # if you have permissions problems or obscure errors try logging in as
>>> mythtv
>>> User=mythtv
>>> #User=root
>>> # Uncomment one of the following...
>>> # Use sysloging rather than separate logging:
>>> #ExecStart=/usr/bin/mythbackend --syslog local7
>>> # If Type=forking is set you must specify the --daemon and --pidfile
>>> options:
>>> #ExecStart=/usr/bin/mythbackend --daemon --logpath /var/log/mythtv
>>> --loglevel crit --pidfile /run/mythbackend.pid
>>> # Default setting for Type=simple.
>>> ExecStart=/usr/bin/mythbackend --logpath /var/log/mythtv
>>>
>>> [Install]
>>> WantedBy=multi-user.target
>>>
>>> --------------------------------
>>>
>>> Also noticed that since the path is /etc/mythtv (not /root/.mythtv)
>>> the permissions are:
>>> [root at mythmaster ~]# ls -ahl /etc/mythtv
>>> total 36K
>>> drwxr-xr-x.   6 mythtv mythtv 4.0K Aug  1 22:44 .
>>> drwxr-xr-x. 140 root   root    12K Aug  1 22:23 ..
>>> drwxr-xr-x.   2 mythtv mythtv 4.0K Aug  1 20:00 3rdParty
>>> drwxr-xr-x.   2 mythtv mythtv 4.0K Aug  1 20:00 channels
>>> -rw-r--r--.   1 mythtv mythtv  513 Aug  1 22:44 config.xml
>>> -rw-r--r--.   1 root   root      0 Aug  1 22:43 config.xml.old
>>> drwxr-xr-x.   2 mythtv mythtv 4.0K Aug  1 20:00 themes
>>> drwxr-xr-x.   3 mythtv mythtv 4.0K Aug  1 20:00 tmp
>>>
>>>
>>> Wondering if there is a need to change either the path or permissions?
>>>
>>
>> The normal way to run mythbackend is to have it run as the mythtv
>> user.  I have never run it as root, but it may not be intended to run
>> that way and it could cause complications.  You do have to have a
>> mythtv user on the system for that to work, but it does not have to be
>> a login enabled user.  The default is to also have a mythtv group (to
>> which the mythtv user and any user that runs mythfrontend must
>> belong).  Then you put all the things that mythbackend needs in the
>> /home/mythtv/.mythtv directory, such as config.xml and the channels
>> directory with all the channel icon files.  If you want to have just
>> one config.xml file, then you can put that in /etc/mythtv and ln -s to
>> it from all the /home/<username>/.mythtv directories.
>>
>> This is what a good config.xml file looks like (copied from my test PC
>> which was installed as a 0.28 system a few months ago):
>>
>> <Configuration>
>>   <Database>
>>     <PingHost>1</PingHost>
>>     <Host>10.0.2.12</Host>
>>     <UserName>mythtv</UserName>
>>     <Password>********</Password>
>>     <DatabaseName>mythconverg</DatabaseName>
>>     <Port>3306</Port>
>>   </Database>
>>   <WakeOnLAN>
>>     <Enabled>0</Enabled>
>>     <SQLReconnectWaitTime>0</SQLReconnectWaitTime>
>>     <SQLConnectRetry>5</SQLConnectRetry>
>>     <Command>echo 'WOLsqlServerCommand not set'</Command>
>>   </WakeOnLAN>
>> </Configuration>
>>
>> There are some other things that can be added to the config.xml file
>> by mythfrontend, but those settings are what is wanted by mythbackend.
>> Fill in the correct names, addresses and password for your system. You
>> may or may not need the pinghost option set on - I have it on because
>> I am connecting via the external IP address for the PC, not localhost,
>> so I do not want mythbackend to try to connect until that address is
>> pingable.
>>
>> There are different older formats for config.xml that also seem to
>> still work, but I believe the above is the current format.
>>
>> I beg to differ. This is mine:
>
> mythtv at jade:/home/mythtv# cat /etc/mythtv/config.xml
> <Configuration>
>   <LocalHostName>jade.example.com</LocalHostName>
>   <Database>
>     <PingHost>1</PingHost>
>     <Host>192.168.NNN.NNN</Host>
>     <UserName>mythtv</UserName>
>     <Password>XXXXXXXXXX</Password>
>     <DatabaseName>mythconverg</DatabaseName>
>     <Port>3306</Port>
>   </Database>
>   <WakeOnLAN>
>     <Enabled>0</Enabled>
>     <SQLReconnectWaitTime>0</SQLReconnectWaitTime>
>     <SQLConnectRetry>5</SQLConnectRetry>
>     <Command>echo 'WOLsqlServerCommand not set'</Command>
>   </WakeOnLAN>
> </Configuration>
>
> mythtv at jade:/home/mythtv#
>
> That LocalHostName entry is important. /Some/ of the checking that reads
> the file uses the hostname (jade) for the 'Hostname' entries in the
> database and /some/ of the checking uses the fully qualified domain name
> [FQDN] (jade.example.com).
>
> (I forgot during a recent upgrade and ended up with the backend using one
> and the frontend using the other. Hilarity ensued? Er, no.)
>
> It is best to make certain that the system knows what the host is called
> by specifying a LocalHostName entry. It doesn't matter what it is; you can
> use the hostname, the FQDN or anything else that is unique on your system.
>

Is there a way to do this? I know we can do this if i log in to mythconverg
db and use the database but wondering if there is a file I need to modify
otherwise to set this?

I have the host name defined under /etc/hosts

>
> Oh, and in mythtv-setup, make certain that the backend has the *same* IP
> address for backend and master backend entries. Putting hostnames or FQDNs
> there can cause other problems.
>
>
I have the actual IP under both.

This only works if backend IP is set to 127.0.0.1 otherwise it keeps
failing.


> --
>
> Mike Perkins
>
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-users
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org
>
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