ubuntu - development, staging, and production environments rails app -

i'm creating app in addition live production environment requires development , staging environment. production environment live , on own vps instance. record:

myapp.com  1.2.3.4 

the development , staging environments on own vps instance. i've configured appropriate dns records each environment has own sub-domain (a record in myapp.com domain pointing dev/staging server:

dev.myapp.com 5.6.7.8 staging.myapp.com 5.6.7.8 

the nginx confix (rails, passenger) sets root each server (wild card ssl configure in http definition , port 80 redirects port 443):

server {    listen 443;    server_name dev.myapp.com    root /apps/myapp/dev/public }  server {    listen 443;    server_name staging.myapp.com    root /apps/myapp/staging/public } 

i'm bit confused on rails side else need configure environments can access individual dev , staging environments url:

staging.myapp.com dev.myapp.com 

i know capistrano allows set production , staging environments need both dev , staging urls live or should sufficient?

you can set environment each instance using rails_env option. example:

server {   listen 443;   server_name staging.myapp.com;   root /apps/myapp/staging/public;   passenger_enabled on;   rails_env staging; }