[mythtv-users] Upgrade Ubuntu 14 to 16 LTS and errors with MYSQL

Wed Jan 17 03:18:39 UTC 2018

> On Jan 16, 2018, at 9:59 PM, Mitchell Gore <mitchell.gore at gmail.com> wrote:
> 
> doing more troubleshooting.  What i have found out is this is 100% related to MySQL network options.  if change my config.xml file to 127.0.0.1 mythtv can connect to the database.  The issue there is my remote frontends dont connect.
> 
> I dont understand why this wont work:
> 
> mitchell at mythtv:/etc/mysql/mysql.conf.d$ cat /home/mitchell/.mythtv/config.xml
> <Configuration>
>   <LocalHostName>mythtv</LocalHostName>
>   <Database>
>     <PingHost>1</PingHost>
>     <Host>127.0.0.1</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>
> mitchell at mythtv:/etc/mysql/mysql.conf.d$ cat mythtv.cnf
> [mysqld]
> bind-address=0.0.0.0
> max_connections=100
> 
> 
> but when i change the host entry to the IP in config.xml to the sql/mythtvbackend  IP it fails to connect.  Doesn't setting the bind address to all 0's allow connections from any system?
> 
> 

With v29 of mythtv mysql switched to mariadb and the location of the bind-address=:: has changed. So what got installed is overridden.

From my install directions blog:
1.                Before you build a remote v29 mythtv-frontend, you need to fix a mysql or rather mariadb issue to allow remote frontends. Move the mythtv.cnf file from /etc/mysql/conf.d to /etc/mysql/mariadb.conf.d.  Then edit mythtv.cnf and make sure it has a “bind-address=::” that isn’t commented out. You need to override the bind-address=127.0.0.1 statement is a file setup by the install.

There is an explanation on the wiki about the search order for the options. Since /etc/mysql/mariadb.conf.d is searched last you need you cnf file there. And it need to be alphabetically last.  

Jim A

> On Tue, Jan 16, 2018 at 6:14 PM, Mitchell Gore <mitchell.gore at gmail.com <mailto:mitchell.gore at gmail.com>> wrote:
> any other ideas on troubleshooting sql access?
> 
> On Tue, Jan 16, 2018 at 9:36 AM, Jim Abernathy <jfabernathy at outlook.com <mailto:jfabernathy at outlook.com>> wrote:
> 
> 
> On 01/16/2018 09:39 AM, Mitchell Gore wrote:
>> Hello,
>> 
>> initially i wanted to just upgrade MythTV .28 to .29.  After enabling the .29 repo i was getting dependency errors around libmyth.  I ended up doing a Ubuntu release upgrade to 16.04 LTS.  That was all going well until i ran into upgraded MySQL to 5.7 and got the table_cache=128 error from the mythtv-tweaks.cnf file.  I got this error:
>> 
>> Setting up mysql-server-5.7 (5.7.20-0ubuntu0.16.04.1) ...
>> Renaming removed key_buffer and myisam-recover options (if present)
>> ERROR: Unable to start MySQL server:
>> 2018-01-16T00:28:57.390552Z 0 [ERROR] unknown variable 'table_cache=128'
>> 2018-01-16T00:28:57.392762Z 0 [ERROR] Aborting
>> Please take a look at https://wiki.debian.org/Teams/MySQL/FAQ <https://wiki.debian.org/Teams/MySQL/FAQ> for tips on fixing common upgrade issues.
>> Once the problem is resolved, run apt-get --fix-broken install to retry.
>> dpkg: error processing package mysql-server-5.7 (--configure):
>>  subprocess installed post-installation script returned error exit status 1
>> dpkg: dependency problems prevent configuration of mysql-server:
>>  mysql-server depends on mysql-server-5.7; however:
>>   Package mysql-server-5.7 is not configured yet.
>> 
>> dpkg: error processing package mysql-server (--configure):
>>  dependency problems - leaving unconfigured
>> Errors were encountered while processing:
>>  mysql-server-5.7
>>  mysql-server
>> 
>> I cleared that line from the file and reran the sudo apt-get upgrade and all seamed okay.  I was able to upgrade to .29 without issue.
>> 
>> The problems began when i went to upgrade the database by running mythbackend from command line.  For some reason mythbackend was unable to log into the database.  I am able to log into MySQL as root and my MythTV user using the password in /etc/mythtv/config.xml.  The database is still there as well.
>> 
>> I have tried downgrading MythTV to .28 and still get the same errors.  I have also removed MySQL and reinstalled.  At this point i am lost.  Any ideas?
>> 
>> Thanks,
>> Mitchell
> 
> I also have had problems with the upgrading process.  I never could get the upgrade from .27 to .28.  So I just backed up all recordings and the database and completely started over and restored the recording and database.  Had no problems after that.
> 
> I tried to upgrade in place from 16.04 mythtv .28 to v29, but again too many errors.  So I again backed up all the recordings to a NAS and backed up the database. I created a new Ubuntu 16.04 system and went straight to v29 of mythtv.  Restored the recordings and database and all is well.
> 
> That's the only process that I've had work for me.  If you are interested I documented what I did recently so I'd have it somewhere to reference if I had to do it all again due to failed hardware or something. http://mythtvinstall.blogspot.com/2018/01/creating-combined-mythtv-headless.html <http://mythtvinstall.blogspot.com/2018/01/creating-combined-mythtv-headless.html>
> 
> Jim A
> 
>> 
>> 
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