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Making sure NGINX and MongoDB are running
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In order for AEN to run, the dependencies `mongodb` and `nginx` must be up and running. If
either of these fail to start, AEN will not be served on port 80.

Check if `nginx` and `mongod` are both running (RHEL 6x)::

  $ sudo service nginx status
  nginx (pid  25956) is running...

  $ sudo service mongod status
  mongod (pid 25928) is running...


If either of these failed to start, tail the log files. The default location of log files is::

  $ tail -n 50 /var/log/mongodb/mongod.log

  # nginx errors reported in error.log
  $ tail -n 50 /var/log/nginx/error.log
