celery has wrong broker in config files

[Bruno Santos]

After installing mediagoblin and used the systemd init files,
I wasn't able to transcode any files..
After checking the logs /var/log/messages
I get the following error:

ERROR/MainProcess] consumer: Cannot connect to amqp://guest:**@127.0.0.1:5672//: [Errno 111] Connection refused.
Trying again in 14.00 seconds...

[2017-07-28 17:39:06,874: ERROR/MainProcess] consumer: Cannot connect to amqp://guest:**@127.0.0.1:5672//: [Errno 111] Connection refused.
Trying again in 16.00 seconds...

[2017-07-28 17:39:22,912: ERROR/MainProcess] consumer: Cannot connect to amqp://guest:**@127.0.0.1:5672//: [Errno 111] Connection refused.
Trying again in 18.00 seconds.

After searching through the issues, I found issue #859:
https://issues.mediagoblin.org/ticket/859

somewhat related to this problem...

I've checked config_spec.ini and found this:

[celery]
# default result stuff
CELERY_RESULT_BACKEND = string(default="database")
CELERY_RESULT_DBURI = string(default="sqlite:///%(here)s/celery.db")

# default kombu stuff
BROKER_URL = string(default="amqp://")

After changing the kombu stuff to:

BROKER_TRANSPORT = string(default="sqlalchemy")
BROKER_URL = string(default="sqlite:///%(here)s/kombu.db")

now it works...

I've never touched this file, this is configuration by default and there's nothing in the easy deployment wiki page to change something in here...

[Elinvention]

I had the same problem, then I found out that devs made the decision to switch to RabbitMQ, instead of using a sqlite database as a queue for celery's tasks. The discussion is here: ​2016-09-04 meeting and ​2017-03-04 meeting.

So those lines are needed if you want to keep the deprecated sqlite middleware, or you can

apt install rabbitmq-server

and that's it.