Appscale fails to start

[Prashant Hegde]

Hello Chris & team,

In one of the appscale deployments, we are seeing the following exception in controller.log, which causes the "appscale up" to stop at "granting privileges stage...".

===

I, [2019-10-16T14:16:51.139590 #28327]  INFO -- : Creating /opt/appscale/apps/appscaledashboard.tar.gz
/var/lib/gems/2.3.0/gems/posixpsutil-0.1.0-x86_64-linux/lib/posixpsutil/process.rb:284:in `name': undefined method `length' for nil:NilClass (NoMethodError)
        from /root/appscale/AppController/lib/ejabberd.rb:64:in `block in ensure_correct_epmd'
        from /root/appscale/AppController/lib/ejabberd.rb:62:in `each'
        from /root/appscale/AppController/lib/ejabberd.rb:62:in `ensure_correct_epmd'
        from /root/appscale/AppController/lib/ejabberd.rb:31:in `start'
        from /root/appscale/AppController/djinn.rb:4500:in `start_ejabberd'
        from /root/appscale/AppController/djinn.rb:3336:in `block in start_stop_api_services'

==== 

Any clues as to what could be wrong?

Thanks in advance

Prashant

[Chris Donati]

This seems like an uncaught exception in the PosixPsutil Ruby gem. I'll see if I can submit a fix upstream.

In the meantime, you can try the following diff to see if it fixes your issue:

https://github.com/AppScale/appscale/compare/release-3.6...cdonati:psutil-fallback

I based it off the 3.6 release branch since the line numbers in your stack trace indicate that might be what you are using.

(Sorry about the double email. I mistakenly omitted the google group from the recipient list on the first email.)

[Prashant Hegde]

As always, thanks Chris for coming to the rescue. This worked like magic. Thank you!

I am wondering - This server was working fine 3 months earlier when it was installed.. ( and was left untouched since). Does this error manifests after some update?

Regards

[Graziano Obertelli]

From the look of it, the error seems a race condition while trying to
get the list of running processes. The upgrade may have triggered it in
the sense that you had to do an up/down.

thanks for reporting, we'll have this fix in the next release :)

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[Prashant Hegde]

Thanks for the clarification !

Regards

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