[mythtv-users] Ver 31 frontend cannot connect to the database

[Mike Carron]

On 11/22/20 7:14 PM, Bill Meek wrote:
>> On 11/22/20 5:20 PM, Bill Meek wrote:
>>> On 11/22/20 6:23 PM, Mike Carron wrote:
>>>> My backend host recently failed badly enough that I was not able to
>>>> salvage anything so I replaced the hardware and installed a new Ubuntu
>>>> 20.04 and a new v31 mythtv-backend-master with xmltv.
>>>>
>>>> I then upgraded a remote frontend (Ubuntu 18.04) from MythTV 30 to 31
>>>> but that frontend will not connect to the database.
>>>>
>>>> I've checked and rechecked the frontend setup screen and everything is
>>>> correct. The config.xml files for both look like they should work. I've
>>>> tried the backend config with </host> = localhost and = 192.168.0.222
>>>> (the backend machine IP). The frontend config host is 192.168.0.222.
>>>>
>>>> I know the ip addresses are good. I can load 192.168.0.222:6544 into the
>>>> address line of the Firefox on the frontend machine and it finds the
>>>> database immediately.
>>>>
>>>> I'm no doubt missing something obvious but I can't find it. It seems
>>>> like I have worn out 2 search engines trying.
>>>>
>>>> Suggestions?
>>>>
>>>> mike
>>> On the backend's config.xml, always use localhost (or 127.0.0.1 if localhost
>>> can't be resolved). That causes a socket to be used.
>>>
>>> See if mysql is running on the backend: systemctl status mysql mysqld mariadb
>>> Probably is if the backend is running OK.
>>>
>>> One of the above ^^^ should be running. All three will work if
>>> using mariadb and the Alias= lines in the service are setup.
>>>
>>> On the frontend, the following three must work: ping 192.168.0.222,
>>> nmap --reason -p 3306 192.168.0.222 (expect a syn-ack) and then:
>>>
>>>     mysql --host=192.168.0.222 --user=mythtv --password=<from config.xml> mythconverg
> On 11/22/20 8:50 PM, Mike Carron wrote:
>> backend's config.xml uses localhost.
>>
>> status for mysql, mysqld and mariadb: active (running)
>>
>> ping 192.168.0.222 works
>>
>> nmap --reason -p 3306 192.168.0.222 produces:
>>
>> PORT     STATE  SERVICE REASON
>> 3306/tcp closed mysql   reset ttl 64
>> MAC Address: A8:5E:45:E3:5A:9F (Unknown)
>>
>> mysql --host=192.168.0.222 --user=mythtv --password=<from config.xml>
>> mythconverg produces:
>>
>> ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.0.222' (111)
>>
>> This looks like the problem but I have no idea how to fix it.
> See the answer from Ramesh.
>
> grep --recursive bind.address /etc/mysql
>
> My choice, which allows connections from any host
> including IPv6:
>
> $ cat /etc/mysql/mariadb.conf.d/mythtv.cnf
> [mysqld]
> bind_address=::
>
> Restart mysql for it to take affect.
>

On my backend /etc/mysql/mariadb.conf.d contains: 50-client.cnf
50-mysql-clients.cnf  50-mysqld_safe.cnf  50-server.cnf.

mythtv.cnf is in /etc/mysql/conf.d/,  the contents are:

[mysqld]
bind-address=::
max_connections=100

I restarted mysql. Nothing changed.

mike