Using Capistrano to deploy a Rails application to multiple web servers

Question

I\'m currently setting up a new production environment for a Rails application which includes multiple, load-balanced application servers (currently only two, but this will

Answer 1

Yeah. Capistrano manages multiple servers natively. No need for capistrano ext.
You only need to define multiple roles

role :app, "myserver.example.com"
role :db,  "mysecondserver.example.com"

By default your tasks will be executed on every server. But you can limit a task to one or some servers only.

task :migrate, :roles => [:app, :db] do
    # ...
end

Here, the task will be executed only on the app and db roles.

You can do the same with the run method.

run "rake db:migrate", :roles => :db

The rake db:migrate will be run only on the db server.

Answer 2

Assuming capistrano multistage:

In config/deploy/production:

role :app, "server1", "server2", "server3"

Now a cap deploy production will deploy to all 3 servers.

Answer 3

This is what I have tried in rails 4:

config/deploy.rb:

role :app, %w{server1 server2 server3}