Sample Chef recipe for configuring the webserver for a LAMP application.

webserver.rb

#
# Cookbook Name:: hello_app
# Recipe:: webserver
#
# Copyright 2012, Jason Grimes
#
# 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.
#

app_name = 'hello_app'
app_config = node[app_name]
app_secrets = Chef::EncryptedDataBagItem.load("secrets", app_name) 

include_recipe "apache2"
include_recipe "apache2::mod_php5" 

# Set up the Apache virtual host 
web_app app_name do 
  server_name app_config['server_name']
  docroot app_config['docroot']
  #server_aliases [node['fqdn'], node['hostname']]
  template "#{app_name}.conf.erb" 
  log_dir node['apache']['log_dir'] 
end

# Determine the master database
if node['roles'].include?('db_master')
  master_db_host = 'localhost'
else
  results = search(:node, "role:db_master AND chef_environment:#{node.chef_environment}")
  master_db_host = results[0]['ipaddress']
end 

#
# Set up the local application config.
# This part is most likely to be different for different applications.
#

directory "#{app_config['config_dir']}" do
  owner "root"
  group "root"
  mode "0755"
  action :create
  recursive true
end

template "#{app_config['config_dir']}/local.config.php" do
  source "local.config.php.erb"
  mode 0440
  owner "root"
  group node['apache']['group']
  variables(
    'db_master' => {
      'user' => app_config['db_user'],
      'pass' => app_secrets[node.chef_environment]['db_pass'],
      'dbname' => app_config['db_name'],
      'host' => master_db_host,
    } 
  )
end

# Copy a test script into the web root
template "#{app_config['docroot']}/test.php" do
  source "test.php.erb"
  mode 0644
  owner "root"
  group node['apache']['group']
  variables 'config_dir' => app_config['config_dir']
end