Elastic beanstalk is not reading environment variables.

Question

Hello,  
I'm running a Rails 6 app on AWS Elastic Beanstalk, but I get from puma log the following (repeats every few seconds)  
  
\[X] + Gemfile in context: /var/app/current/Gemfile  
\[X] Early termination of worker  
  
The version numbers:  
Rails 6.0.3.3  
puma 4.3.5  
ElasticBeanstalk Ruby 2.7 running on 64bit Amazon Linux 2/3.1.1  
ruby 2.7.1p83  
  
The server is unresponsive from outside the instance, and there's nothing on log/production.log.  
Running on a dev machine on production mode there's no errors, and the database is reachable (no migration failure).  
I ran the Rails console (production) on the instance and found that the database settings were missing. When I hardcoded them, the database was reachable and working.  
I then found that none of the environment variables set on ElasticBeanstalk web console are present (as opposed to what the documentation describes).  
  
Is this a platform bug, or am I missing a way to define environment variables?  
  
Edited by: arsawatt on Sep 21, 2020 5:19 PM  
  
Edited by: arsawatt on Sep 21, 2020 10:29 PM

Accepted Answer

I have the same problem with the same configuration. However I have all the environment variables properly set.  
  
Rails 6.0.3.3  
puma 4.3.5  
ElasticBeanstalk Ruby 2.7 running on 64bit Amazon Linux 2/3.1.1  
ruby 2.7.1p83  
  
No problems in dev, but puma/nginx are not working properly. In /var/app/puma/puma.log, I get the same occurence:  
  
\[X] + Gemfile in context: /var/app/current/Gemfile  
\[X] Early termination of worker  
  
---------------------------------------------  
  
SOLVED!  
In my case, the problem was a puma dependency that has been silently updated.   
I ssm'ed into the machine, executed 'pumactl start' and got an error:  
  
/opt/rubies/ruby-2.7.1/lib/ruby/site_ruby/2.7.0/bundler/runtime.rb:312:in `check_for_activated_spec!': You have already activated nio4r 2.5.2, but your Gemfile requires nio4r 2.5.4. Prepending `bundle exec` to your command may solve this. (Gem::LoadError)  
  
then I doublechecked the pull request and noticed that the gem nio4r was updated.  
  
The solution was forcing the nio4r to 2.5.2 in the Gemfile.  
  
Hope it is suitable for you too.  
  
Best Regards,  
Pedro  
  
Edited by: pedrorgomes on Sep 22, 2020 8:51 AM

Answer

follow up question:  
upgrading to ElasticBeanstalk Linux 2/3.1.2 broke things again.  
  
have you seen this? thanks!

Answer

A thousand thanks!

Answer

Beware if you `bundle update` in August 2021, as **nio4r** bumped to version 2.5.8 during the last month, and this doesn't match the version on the current Beanstalk platform **Ruby 2.7 AL2 version 3.3.4**  
  
Edited by: philayres on Aug 31, 2021 4:35 PM

Elastic beanstalk is not reading environment variables.

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