puppet: 测试ENC的scope.

  Talks is cheap, show me the code. 

class sample($users, $password, $port) {

# defaults for a resource
  File {
    owner => root,
    group => root,
    mode => "0644",
   }

  file { "/tmp/t1.conf":
         # source =>puppet:///, a sample needs to be located at ${modulename}/files/
         content => template("${module_name}/t1.conf.erb"),
        #content => "hello,$ports",
     }

    notify { "$users":}



}

#  /templates/t1.conf.erb
you come from [<%= @location %>]
Server passed == [<%= @password %>]
Userlist:
<% @users.each do |key,val| -%>
    Home for <%= key %> is <%= @users[key]['home'] %>
    userid == <%= val['uid'] %>
<% end -%>

# ENC

---
classes:
  sample:
    port: 9999
    password: fake
    users:
      alex:
        home: /home/alex
        uid: 502
      jane:
        home: /home/jane
        uid: 201

environment: production
parameters:
  location: beijing

puppet agent -t
Info: Using configured environment 'production'
Info: Retrieving pluginfacts
Info: Retrieving plugin
Info: Caching catalog for   xxxx
Info: Applying configuration version '1472271742'
Notice: {alex => {home => /home/alex, uid => 502}, jane => {home => /home/jane, uid => 201}}
Notice: /Stage[main]/Sample/Notify[{alex => {home => /home/alex, uid => 502}, jane => {home => /home/jane, uid => 201}}]/message: defined 'message' as '{alex => {home => /home/alex, uid => 502}, jane => {home => /home/jane, uid => 201}}'
Notice: Applied catalog in 0.05 seconds

 cat /tmp/t1.conf

you come from [beijing]
Server passed == [fake]
Userlist:
    Home for alex is /home/alex
    userid == 502
    Home for jane is /home/jane
    userid == 201

可以看到 1. parameter在ENC里面是top scope,  2. ENC的classes可以带参数。并且是node scope的。

     现在parameterized class有3种办法传递参数了，第一个是默认值，第二个就是本例子所示，还有一个就是hiera的自动lookup了。只要你参数写好，然后对应的hiera的yaml文件有参数的就可以了。之前可能还需要scope.lookupvar之类的，现在4.6版本已经改成scope[ ] 了，而且只在ERB里面用。

    顺带说下parameterized class,

define user::add_user($comment, $home, $shell, $uid, $gid, $password)
{

include user

user { "$name":
name =>"$name",
ensure => absent,
comment => "$comment",
home => "$home",
shell => "$shell",
uid => "$uid",
password => "$password",
gid => "$gid"
}


}

然后init.pp
   class user ($lists
){
create_resources(user::add_user, $lists)

}
### ENC
---
classes:
  user:
    list:
      jeckman:
        comment: Jack
        gid: 100
        home: /home/jeckman
        name: jeckman
        password: xxxxxx
        shell: /bin/bash
        uid: 10146
      saga:
        comment: Arun
        gid: 100
        home: /home/saga
        name: saga
        password: xxxxx
        shell: /bin/bash
        uid: 70960

environment: production
parameters:

结果是：
Notice: /Stage[main]/User/Notify[{jeckman => {comment => Jack, gid => 100, home => /home/jeckman, name => jeckman, password => xxxxxx, shell => /bin/bash, uid => 10146}, saga => {comment => Arun, gid => 100, home => /home/saga, name => saga, password => xxxxx, shell => /bin/bash, uid => 70960}}]/message: defined 'message' as '{jeckman => {comment => Jack, gid => 100, home => /home/jeckman, name => jeckman, password => xxxxxx, shell => /bin/bash, uid => 10146}, saga => {comment => Arun, gid => 100, home => /home/saga, name => saga, password => xxxxx, shell => /bin/bash, uid => 70960}}'
Notice: Applied catalog in 0.05 seconds

此时$list就是参数了，它从ENC读取，然后是个hash给create_resources（）用。

注意define里面的参数不能用$name和$title，
Note that the special variables $title and $name are both set to the defined type’s name automatically, so they can’t be used as parameters.