Ruby script to change every single IP reference in cloudfoundry VCAP_SETUP to a new IP. Name it: vcap_dev_update_ip -> /home/manu/cloudfoundry/vcap/dev_setup/bin/vcap_dev_update_ip It needs to know the vcap configuration location. The associated script will use: /home/manu/cloudfoundry/.deployments/devbox/config. Chage if needed

gistfile1.txt

#!/usr/bin/env ruby
# Update the IP address in a CF deployed config files.
# Look for an IP address in all the yml files in a 
# particular folder and replace it with the current IP address

DIR = File.dirname(__FILE__)

module VcapUtilities
  
  # Reads the ip of a given interface
  # defaults on eth0 then on wlan0.
  def self.ip_auto(interface='eth0')
    res=`ifconfig | sed -n '/#{interface}/{n;p;}' | grep 'inet addr:' | grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}' | head -1`
    if interface == 'eth0' && res.empty?
      VcapUtilities.ip_auto "wlan0"
    else
      res
    end
  end
  def self.ip_nats_server(config_folder_path)
    # written in nats_server/nats_server.yml
    # net: 38.102.156.55
    nats_server_file_yml = File.join config_folder_path, "nats_server", "nats_server.yml"
    raise "The file #{nats_server_file_yml} does not exist." unless File.exists? nats_server_file_yml
    File.new(nats_server_file_yml).each_line() do |line|
      line =~ /^net\: ([^ ]*)$/
      return $1 unless $1.nil?
    end
  end
  
  class UpdateLocalIP
    attr_accessor :config_folder_path
    attr_accessor :local_ip
    attr_accessor :old_local_ip
    def initialize(config_folder_path="#{DIR}/config", network_interface_name = nil, local_ip = nil, old_local_ip = nil)
      @config_folder_path=config_folder_path
      @local_ip = local_ip
      @old_local_ip = old_local_ip
      @network_interface_name = network_interface_name || "eth0"
      @local_ip ||= VcapUtilities.ip_auto(@network_interface_name)
      count = 0
      while (@local_ip.nil? || @local_ip.empty?) && count <= 3
        puts "Could not detect the local IP on #{@network_interface_name}. Waiting 40 seconds then trying again."
        sleep 40
        @local_ip ||= VcapUtilities.ip_auto(@network_interface_name)
      end
      raise "Unable to read the current IP address on #{@network_interface_name}" if @local_ip.nil? || @local_ip.empty?
      
      @old_local_ip ||= VcapUtilities.ip_nats_server(@config_folder_path)
      raise "Unable to detect the local IP on #{@network_interface_name}" if @local_ip.nil?
      raise "Unable to detect the old IP" if @old_local_ip.nil?
      @local_ip = @local_ip.strip
      @old_local_ip = @old_local_ip.strip
    end
    def update()
      if @local_ip == @old_local_ip
        puts "The IP #{@local_ip} on #{@network_interface_name} is unchanged."
        return
      end
      puts "Updating the IP from #{@old_local_ip} to #{@local_ip} in the CloudFoundry config files in #{@config_folder_path}"
      yaml_files = Dir.glob File.join(config_folder_path, "**", "*.yml")
      raise "No yml file inside #{config_folder_path}" if yaml_files.empty?
      yaml_files.each do |path|
        `sed -i "s/#{@old_local_ip}/#{@local_ip}/g" #{path}`
      end
    end
  end
end

if ARGV.empty?
  configdir = Dir.pwd
else
  configdir = ARGV.shift
  if configdir == '-h' or configdir == '--help'
    puts "Usage: #{$0} [CONFIGDIR=.] [NETWORK_INTERFACE=eth0,wlan0] [LOCAL_IP=auto] [OLD_IP=auto]"
    exit 0
  elsif configdir == '-n' || configdir == '--name'
    runtimeconfig = ARGV.shift
    configdir = File.expand_path(File.join(ENV["HOME"], "cloudfoundry", ".deployments", runtimeconfig, "config"))
  end
  network_interface_name = ARGV.shift
  ip = ARGV.shift
  old_ip = ARGV.shift
end
unless File.exists? configdir
  STDERR.puts "#{configdir}/nats_server/nats_server.yml does not exists."
  exit 1
end
network_interface_name ||= "eth0"
updateLocalIP = VcapUtilities::UpdateLocalIP.new(configdir, network_interface_name, ip, old_ip)
updateLocalIP.update