The status page in Airtime does not show a status for some services: airtime_analyzer, airtime-playout, airtime-liquidsoap. The services might be running correctly though. You can check via our own monitoring or service SERVICE-NAME status and journalctl -u SERVICE-NAME | tail
Error 500 / No PHP logs
You would suspect PHP logs in /var/log/airtime/zendlog.log. But there is none (or it is not up to date). Check /var/log/apache2/error.log: It might show:
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[Mon Dec 16 16:36:41.959122 2019] [:error] [pid 26398] [client 127.0.0.1:39688] PHP Fatal error: Uncaught exception 'Zend_Log_Exception' with message '"/var/log/airtime/zendphp.log" cannot be opened with mode "a"' in /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Log/Writer/Stream.php:81\nStack trace:\n#0 /usr/share/airtime/php/airtime_mvc/application/logging/Logging.php(11): Zend_Log_Writer_Stream->__construct('/var/log/airtim...')\n#1 /usr/share/airtime/php/airtime_mvc/application/logging/Logging.php(83): Logging::getLogger()\n#2 /usr/share/airtime/php/airtime_mvc/application/logging/Logging.php(166): Logging::error('Uncaught except...')\n#3 [internal function]: Logging::loggingShutdownCallback()\n#4 {main}\n thrown in /usr/share/airtime/php/vendor/zendframework/zendframework1/library/Zend/Log/Writer/Stream.php on line 81
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Check the permissions on /var/log/airtime/zendlog.log. It should be 0777, probably.
DNS Problems
2019-05-20
Recently the HfK-network experienced isses with its DNS Servers (172.16.0.1 + 172.16.0.2). Local streaming services (darkice, airtime, icecast) were affecetd. Resolved by adding additional 3rd-party DNS Servers form Digitalcourage (46.182.19.48) + Chaos Computer Club (213.73.91.35) to /etc/netplan/XX.yaml.
If the Airtime logs indicate failures to connect to the RabbitMQ server, such as:
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2013-10-31 08:21:11,255 ERROR - [pypomessagehandler.py : main() : line
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99] - Error connecting to RabbitMQ Server. Trying again in few seconds
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2013-10-31 08:21:11,255 ERROR - [pypomessagehandler.py : main() : line 99] - Error connecting to RabbitMQ Server. Trying again in few seconds - See more at: http://forum.sourcefabric.org/discussion/16050/#sthash.W8OJrNFm.dpuf
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but the RabbitMQ server is running normally, this error might be due to a change in the server's hostname since Airtime installation. Directory names under /var/lib/rabbitmq/mnesia/ indicate that RabbitMQ's database files are organised according to the hostname of the server, for example:
where the hostname is airtime.example.com. If the hostname has changed, it may be necessary to reconfigure RabbitMQ manually, as follows:
Delete the files in /var/lib/rabbitmq/mnesia/
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sudo rm -r /var/lib/rabbitmq/mnesia/*
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Restart RabbitMQ:
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sudo invoke-rc.d rabbitmq-server restart
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Enter the following commands to set up authentication and grant permissions. The rabbitmqctl add_user command requires the RabbitMQ password from the /etc/airtime/airtime.conf file as an argument. The rabbitmqctl set_permissions command should be entered on one line, with the list of Airtime services repeated three times:
Libretime logs PHP errors into /var/log/airtime/zendphp.log You can use Libretimes log controller to add custom log statements to the code. (Native echo() and print_r() will not help much.) Use Logging::error(), Logging::warn(), Logging::info() or Logging::debug() from anywhere in the Libretime codebase.
Error 500 in airtime-playout (pypo) and Invalid argument supplied for foreach() zendphp.log
2019-06-21
Phenomenon
airtime-playout (sudo -u www-data python /usr/bin/airtime-playout) is outputting 500 errors for all API requests:
2019-06-01 19:38:06,323 [api_client] [ERROR] HTTP Error 500: Internal Server Error
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2019-06-01 19:38:06,373 [api_client] [ERROR] HTTP Error 500: Internal Server Error
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zendphp.log is showing errors like:
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2019-06-01T19:36:06+00:00 ERR (3): studio.radioangrezi.de [ErrorController.php:54 - errorAction()] - An internal application error has occurred.: exception 'ErrorException' with message 'Invalid argument supplied for foreach()' in /usr/share/airtime/php/airtime_mvc/application/models/ListenerStat.php:98
for ListenerStat.php:98 and ApiController.php:1870
Not-the-solution
Checked files: ListenerStat.php and ApiController.php -> POST getParams() always empty. -> no data -> null / true object (which is not iterable).
Also checked: airtime-playout.py / listenerstat.py and api_client.py -> all not faulty, because dumped (tcpdump) http packets showed correct payload.
Notices on the side, but not related: SQLSTATE[55P03]: Lock not available: 7 ERROR: could not obtain lock on row in relation "cc_pref" (#465)
in place updated of Airtime / Libretime will not be easy. (#623)
Solution
The hostname and default apache vhost was changed. Since than the error occured. Apache was 301 forwarding requests made to anregzistudio.hfk-bremen.de to studio.radioangrezi.de. POST data is lost when forwarding!
Put correct hostname in base_url of /etc/airtime.conf. This would go for a port change as well (e.g. HTTPS)!
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3 [general]
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4 api_key = ...
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5 web_server_user = www-data
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6 base_url = studio.radioangrezi.de
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7 base_port = 80
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Helpful
Dump local http requests with payload: sudo tcpdump -s 0 -A 'tcp dst port 80 and (tcp[((tcp[12:1] & 0xf0) >> 2):4] = 0x504f5354)' -i lo