Dev Blog AF83

How to run several instances of a rails app with a single code base?

What is the problem?

Sometimes you want to run several instances of the same application on your server. How to easily do this in rails?

The solution

Rails offers us the environments, allowing to run an application under different status: development, test or production environment.

We just have to create in the database.yml a specific database connection for each new environment:

prod1:
  adapter: mysql
  database: prod_one
  username: root
  password: password

and for another instance

prod2:
  adapter: mysql
  database: prod_two
  username: root
  password: password

and to create a specific configuration file ‘prod1.yml’ in the directory config/environments/.

After this, you just generate the database schema with the following command:

rake db:migrate RAILS_ENV=prod1

And run the server on a specified port:

./script/server -p 4001 -e prod1

Et voilà! an instance running on the specified port (4000).

If you want another one (let’s say prod2).

Let’s create the database instance… rake db:migrate RAILS_ENV=prod2

./script/server -p 4002 -e prod2 … and another instance of the same code base is now running on port 4002.

Bliss.

This entry was posted on Thursday, June 7th, 2007 at 1:39 pm and is filed under configuration, ruby. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.