deploy.rb

# Requires the presence of a failover node that will get activated when the site is in maintenance mode, and will be disabled when the site is live.

namespace :deploy do

  namespace :web do
    
    desc <<-DESC
      Disable via Cloud Load Balancers
    DESC
    task :lbdisable do 
      filename = File.expand_path(File.dirname(__FILE__) + "/../config/rackspace_cloudfiles.yml")
      creds = YAML.load_file(filename)['development']

      lb = CloudLB::Connection.new(:username => creds['username'], :api_key => creds['api_key'], :region => :dfw, :snet => creds['snet'])
      balancer_ids = []
      lb.load_balancers.each do |load_balancer|
        balancer_ids << load_balancer[:id] if [http_load_balancer,https_load_balancer].include?(load_balancer[:name])
      end
      
      balancer_ids.each do |balancer_id|
        
        # Enable the failover
        balancer = lb.load_balancer(balancer_id)
        balancer_nodes = balancer.nodes
        failover_node = balancer_nodes.select{|n| n[:address] == failover}.first
        if failover_node
          balancer.node(failover_node[:id]).condition = "ENABLED"
        end
        sleep 1
        
        balancer_nodes.delete(failover_node)
        
        # Disable the rest
        balancer_nodes.each do |n|
          balancer.refresh
          until balancer.status == "ACTIVE"
            sleep 1
            balancer.refresh
          end
          balancer.node(n[:id]).condition = "DISABLED"
        end
        sleep 1
      end
    end
    
    desc <<-DESC
      Enable via Cloud Load Balancers
    DESC
    task :lbenable do 
      filename = File.expand_path(File.dirname(__FILE__) + "/../config/rackspace_cloudfiles.yml")
      creds = YAML.load_file(filename)['development']

      lb = CloudLB::Connection.new(:username => creds['username'], :api_key => creds['api_key'], :region => :dfw, :snet => creds['snet'])
      balancer_ids = []
      lb.load_balancers.each do |load_balancer|
        balancer_ids << load_balancer[:id] if [http_load_balancer,https_load_balancer].include?(load_balancer[:name])
      end
      
      balancer_ids.each do |balancer_id|
        balancer = lb.load_balancer(balancer_id)
        balancer_nodes = balancer.nodes
        failover_node = balancer_nodes.select{|n| n[:address] == failover}.first
        balancer_nodes.delete(failover_node)
        sleep 1
        # Enable the regular nodes
        balancer_nodes.each do |n|
          balancer.refresh
          until balancer.status == "ACTIVE"
            sleep 1
            balancer.refresh
          end
          balancer.node(n[:id]).condition = "ENABLED"
          sleep 1
        end
        
        # Disable the failover
        if failover_node
          balancer.refresh
          until balancer.status == "ACTIVE"
            sleep 1
            balancer.refresh
          end
          balancer.node(failover_node[:id]).condition = "DISABLED"
        end
        
      end
    end
    
    
  end