CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3deploymentcapistrano
ngw
ngw

Reputation: 1282

How do I separate roles in Capistrano?

I am trying to deploy my RoR application with Capistrano. Everything was fine until I introduced another role in my Capistrano config, the :web role, which supposedly would be my HTTP/reverse proxy server.

My understanding is that the :app role should refer to the application server (thin, mongrel, whatever) and the :web role should refer to the frontend server (nginx, apache), so I'm rather confused by the choice of running all tasks on all roles, even though capistrano separates them by default.

Right now my problem is that I'm not able to make the deploy:update_code run only on the servers that have an :app role, for example, and capistrano errors out because it tries to run update_code on my web server, where I didn't even install git (I don't need it ...). Has anyone suceeded in doing that? Can someone share the code?

TIA, ngw

Upvotes: 2

Views: 616

Answers (2)

Roger Rohrbach
Roger Rohrbach

Reputation: 21

This problem arises because the built-in tasks don't respect the role limitations on your custom tasks that invoke them, i.e.,

task my_task, :roles => :web do
    run "some command"  # will only be executed on servers with the :web role
    update              # will be executed for all roles
end

You will, as you intuited, have to override all the built-in tasks. Or you can try Rodney Koch's patch to Capistrano.

Upvotes: 1

Macho Matt
Macho Matt

Reputation: 1306

Are you explicitly specifying the role in the task name? 

task :task_A, :roles => :web do
  #do stuff here
end

task :task_B, :roles => :app do
  #do stuff here
end

Upvotes: 0

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