Different instances of the same Rails app, each using a different database

Question

I have a rails app of which I am running two server instances (different ports, different PID).

rails s -p 8081 -P 12345
rails s -p 8082 -P 54321

However, I would like each of them to connect to a different mongodb database (for example: db12345 and db54321, respectively).

The problem is that I don't know whether this is possible and if so, how to specify it in my mongoid.yml configuration file.

The respective section of my mongoid.yml file, allowing me to use the db12345 database, currently looks like this:

development:
  options:
    raise_not_found_error: false
  sessions:
    default:
      database: **db12345**
      hosts:
        - localhost:27017
      options:
        max_retries: 30
        retry_interval: 1
        timeout: 15
        refresh_interval: 10

What I am having trouble with is finding a way to link each instance of the same rails app to the (different) database it should use. Is this even meant to be dealt with in mongoid.yml?

Thank you!

Sergio Tulentsev · Accepted Answer · 2016-07-01 08:52:15Z

1

You can control this via environment variables. Have your apps launched in this manner:

DBNAME=db12345 rails s -p 8081 -P 12345
DBNAME=db54321 rails s -p 8082 -P 54321

Then just refer to this var in mongoid.yml, with a sane default:

  sessions:
    default:
      database: <%= ENV['DBNAME'] || 'db12345' %>

answered Jul 1, 2016 at 8:52

Sergio Tulentsev

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3 Comments

M T Over a year ago

This is exactly what I was looking for! Thank you so much! There is also a dba stackexchange question related to this. I don't know how this works, but if you want you can answer this question over there as well. Here's the link: dba.stackexchange.com/questions/142445/…

Sergio Tulentsev Over a year ago

@MT: crossposting is discouraged on stackexchange. But this question does look like a valid DBA stuff, so I'm going to post the answer there too.

M T Over a year ago

Thank you! Good to know! I was thinking others might be looking for an answer over there. In any case, thank you for your help!

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