puppet：define + ENC + Hiera实现apache的Vhost

### ENC
---
classes:
  apache::final:

environment: production
parameters:

# hiera 配置
---
:backends:
  - yaml
:hierarchy:
  - "nodes/%{::hostname}"
  - common

:yaml:
# - /etc/puppetlabs/code/environments/%{environment}/hieradata on *nix
# - %CommonAppData%\PuppetLabs\code\environments\%{environment}\hieradata on Windows
# When specifying a datadir, make sure the directory exists.
  :datadir: "/etc/puppetlabs/code/environments/%{::environment}/hieradata"

####### apache module #########


::::::::::::::
final.pp
::::::::::::::
class apache::final{

    $vhost = hiera('apache::vhost', {})
    create_resources('apache::vhost', $vhost)

}
::::::::::::::
init.pp
::::::::::::::
class apache {

   include apache::install
   include apache::service

}
::::::::::::::
install.pp
::::::::::::::
class apache::install {

 include apache::params

 package { 'apache':

        ensure => present,
        name => $apache::params::apache_name,

        }
}
::::::::::::::
params.pp
::::::::::::::
class apache::params {

# install http/apace2 on redhat series and debian respectively.

  if $::osfamily == 'RedHat' {
    $apache_name = 'httpd'
    $conf_dir = '/etc/httpd/conf.d'
    $template = 'vhost-rh.conf.erb'

  }elsif $::osfamily == 'Debian' {
    $apache_name = 'apache2'
    $conf_dir = '/etc/apache2/conf.d'
    $template = 'vhost-deb.conf.erb'

  }else {
    fail( "This is not a supported distro.")
  }

}
::::::::::::::
service.pp
::::::::::::::
class apache::service {
  include apache::params

  service {$apache::params::apache_name :

     ensure => running,
     require => Class['apache::install'],
 }
}
::::::::::::::
vhost.pp
::::::::::::::
define apache::vhost(
  $docroot,
  $httpd_port,
  $ssl=true,
  $serveralias,
){

 include apache

 $conf_dir = $apache::params::conf_dir
 $template = $apache::params::template

 file { "${conf_dir}/${name}.conf":

    content => template("apache/$template"),
    mode => "0644",
    owner => root,
    group => root,
    require => Class['apache::install'],
    notify => Class['apache::service'],

    }

  }


Hiera 的数据

---
apache::vhost:
  www.example.com:
    ssl: true
    httpd_port: 8080
    docroot: /var/www/html/www.example.com
    ssl : true
    serveralias:
      - test.example.com
      - hfu.example.com

  test.example.com:
    ssl: false
    httpd_port: 808
    docroot: /var/www/html/abc.example.com
    ssl : true
    serveralias: test.example.com



###templates/vhost-rh.conf.erb   #下边的erb是随便写的，未必准确，同时省略debian的conf


### NameVirtualHost *:<%= @httpd_port %>>
ServerName <%= @name %>
<%if @serveraliases.is_a? Array -%>
<% @serveraliases.each do |name| -%>
<%= " ServerAlias #{@name}\n" %>
<%- end -%>
<%- elsif @serveraliases != '' -%>
<%= "ServerAlias #{@serveraliases}" -%>
<%- end -%>
    DocumentRoot <%= @docroot %>
    Options Indexes FollowSymLinks MultiViews
    AllowOverride None
    Order allow,deny
    allow from all

<%# This is a comment -%>

<= if @ssl == true -%>
    ssl on    ### For test

<%% print a <% %> section %%>

  ErrorLog /var/log/httpd/<%= @name %>_error.log
  LogLevel warn
  CustomLog /var/log/httpd/<%= @name %>_access.log combined
  ServerSignature On
...

题外话，create_resources的接受必须是hash. 现在用hiera 查一下

hiera -d apache::vhost ::environment=production ::hostname=`hostname -s`

DEBUG: 2016-08-27 00:08:14 -0400: Hiera YAML backend starting
DEBUG: 2016-08-27 00:08:14 -0400: Looking up apache::vhost in YAML backend
DEBUG: 2016-08-27 00:08:14 -0400: Looking for data source nodes/ip-10-0-10-78
DEBUG: 2016-08-27 00:08:14 -0400: Found apache::vhost in nodes/ip-10-0-10-78
{""=>
  {"ssl"=>true,
   "httpd_port"=>8080,
   "docroot"=>"/var/www/html/",
   "serveralias"=>["test.example.com", "hfu.example.com"]},
 "test.example.com"=>
  {"ssl"=>true,
   "httpd_port"=>808,
   "docroot"=>"/var/www/html/abc.example.com",
   "serveralias"=>"test.example.com"}}

    为什么要加2个冒号？ 因为命令行下必须传递标准的puppet能识别的变量名字，没有它，environment/hostname均为空。

     题外话，为什么install.pp里面        name   => $apache::params::apache_name, 这又涉及到变量的scope的问题了，params和install分别class, params的变量作用于是Local的，外加要用其值必须用 ${class}::${var}这种方式了。