Example of how to use the vmc library to do an automatic mysql backup of a named service

cf-backup.rb

#!/usr/bin/env ruby

require "rubygems"
require "bundler/setup"

require "vmc"
require "cli"

include VMC::Cli::TunnelHelper
include VMC::Cli::ServicesHelper

class BackupHelper < VMC::Cli::Command::Base
  def backup(service, output_file)

    ps = client.services
    info = ps.select { |s| s[:name] == service }.first

    port = pick_tunnel_port(10000)

    raise VMC::Client::AuthError unless @client.logged_in?

    if not tunnel_pushed?
      auth = UUIDTools::UUID.random_create.to_s
      push_caldecott(auth)
      bind_service_banner(service, tunnel_appname, false)
      start_caldecott
    else
      auth = tunnel_auth
    end

    if not tunnel_healthy?(auth)
      # We don't expect caldecott not to be running, so take the
      # most aggressive restart method.. delete/re-push
      client.delete_app(tunnel_appname)
      invalidate_tunnel_app_info

      push_caldecott(auth)

      bind_service_banner(service, tunnel_appname, false)
      start_caldecott
    end

    if not tunnel_bound?(service)
      bind_service_banner(service, tunnel_appname)
    end

    conn_info = tunnel_connection_info info[:vendor], service, auth
    start_tunnel(port, conn_info, auth)

    cmd = "mysqldump --protocol=TCP --host=localhost --port=#{port} --user=#{conn_info['user']} --password=#{conn_info['password']} #{conn_info['name']} > #{output_file}"
    puts cmd

    `#{cmd}`

    unbind_service_banner(service, tunnel_appname)

  end
end

service_name = ARGV[0]
output_file = ARGV[1]

b = BackupHelper.new
b.backup(service_name, output_file)

Gemfile

source :rubygems
source "http://rubygems.org"

gem 'vmc', '0.3.18'
gem 'caldecott', '>=0.0.5'