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gem install capistrano-scalr

set :gateway, "<gateway_host>"
role :gw, gateway, :no_release => true
set :gateway_type, "<centos|ubuntu>"
require 'capistrano-scalr'

role :lb, :no_release => true do
  scalr_hosts['loadbalancer']
end
role :web, :no_release => true do 
  scalr_hosts['www'] 
end 
role :app do 
 scalr_hosts['app'] 
end 
role :db, :no_release => true do 
 scalr_hosts['mysql'] 
end
role :memcached, :no_release => true do 
  scalr_hosts['memcached'] 
end

set :ssh_options, { :forward_agent => true }

$ cap scalr:enum
  * executing `scalr:enum'
 ** SCALR Hosts:
  * executing "find /etc/aws/hosts | cut -d\"/\" -f5,6 | grep \"/\""
    servers: ["scalrgw.domain.net"]
  * establishing connection to gateway `scalrgw.domain.net'
  * Creating gateway using scalrgw.domain.net
  * establishing connection to `scalrgw.domain.net' via gateway
    [scalrgw.domain.net] executing command
 ** app/10.0.0.1
 ** app/10.0.0.2
 ** www/10.0.0.3
 ** www/10.0.0.4
 ** mysql/10.0.0.5
 ** mysql/10.0.0.6
 ** mysql-slave/10.0.0.5
 ** mysql-master/10.0.0.6
    command finished