[RACKSPACE] Added a ghetto-dns setup for Rackspace Cloud

 Modified from: http://blog.bitfluent.com/post/196658820/using-chef-server-indexes-as-a-simple-dns

rackspace/README.rdoc

@@ -1,5 +1,24 @@
 = DESCRIPTION:
 
+Rackspace Cloud Server recipes
+
+== hosts
+This recipe sets up Ghetto DNS. It queries the server index and builds up a list of nodes that
+have a 172.* address on eth1. From there, it generates a /etc/hosts file. The reason to do this
+is to be able to route all requests through the private IP addresses. This recipe was written 
+to assume your FQDN points to the private IP addresses, and you are using DNS aliases to refer
+to the public IP address.
+
+Additionally, you can specify site-wide IP addresses using the databag "cloud-hosts". For example,
+to specify a global "chef-server":
+
+databag: "cloud-hosts"
+  id: "chef-server"
+  ip: 172.172.172.172
+
+The name for the data-bag is subject to change in future releases of this cookbook. Future 
+versions may also include aliases
+
 = REQUIREMENTS:
 
 = ATTRIBUTES: 

rackspace/metadata.rb

@@ -1,6 +1,6 @@
-maintainer       "Example Com"
-maintainer_email "ops@example.com"
+maintainer       "Ho-Sheng Hsiao"
+maintainer_email "hosh@sparkfly.com"
 license          "Apache 2.0"
-description      "Installs/Configures rackspace"
+description      "Installs/Configures Rackspace Cloud-specific stuff"
 long_description IO.read(File.join(File.dirname(__FILE__), 'README.rdoc'))
 version          "0.1"

rackspace/recipes/hosts.rb

@@ -0,0 +1,54 @@
+#
+# Cookbook Name:: rackspace
+# Recipe:: hosts
+#
+# Copyright 2010, Sparkfly
+# Modified from: http://blog.bitfluent.com/post/196658820/using-chef-server-indexes-as-a-simple-dns
+# Copyright 2009, Bitfluent
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+global_hosts = {}
+hosts        = {}
+
+data_bag('cloud-hosts').each do |host|
+  n = data_bag_item('cloud-hosts', host)
+  global_hosts[n['ip']] = host
+end
+
+# NOTE: According to the 0.8 source code, there is a default row limit of 20. If the interface (via Couchdb) is what
+# I think it is, then this will turn into a sleeping defect. We should be using djdns or PowerDNS by that point
+
+# Structure:
+# network
+#   interfaces
+#     eth1
+#       addresses
+#         locallink
+#         ipv4 addr
+#            addr
+#            netmask
+#            ...
+#         ipv6 addr
+search(:node, "network_interfaces_eth1_addresses:172.*") do |n|
+  addresses = n['network']['interfaces']['eth1']['addresses'].map { |addr| addr[0] }
+  ip = addresses.select { |addr| addr.to_s =~ /172.*/ }.first
+  hosts[ip] = n
+end
+
+template "/etc/hosts" do
+  source "hosts.erb"
+  mode 0644
+  variables(:global_hosts => global_hosts, :hosts => hosts)
+end

rackspace/templates/default/hosts.erb

@@ -0,0 +1,15 @@
+# Ghetto DNS
+# Auto-generated by chef for <%= @node[:fqdn] %>
+
+127.0.0.1       localhost 
+::1             localhost
+
+# Site-wide hosts
+<% @global_hosts.keys.sort.each do |ip| %>
+<%= ip %>       <%= @global_hosts[ip] %>
+<% end %>
+
+# Private IP nodes
+<% @hosts.keys.sort.each do |ip| %>
+<%= ip %>       <%= @hosts[ip]["fqdn"] %> <%= (@hosts[ip]["dns_aliases"] || []).sort.join(" ") %>
+<% end %>