Puppet参数化类案例和create_resources详解

# tree modules/foo

modules/foo

└── manifests

    └── init.pp

class foo (

    $a = 'aaa',

    $b = 'bbb',

    $c = 'ccc',

) {

    notify { "\na=${a}\nb=${b}\nc=${c} ": }

}

执行结果

# puppet apply --modulepath=modules  production/production.pp 

Notice: Compiled catalog for xxxx in environment production in 0.02 seconds

Notice: 

a=aaa

b=bbb

c=ccc
......

Notice: Finished catalog run in 0.01 seconds.

现在来实现override参数化类的default值。

cat production/production.pp 

node default {

 class { foo:

    a => 'tom',

    b => 'jerry',

    c => 'None'

  }

}

结果为 ：
...... ### 省略若干###

message: defined 'message' as '

a=tom

b=jerry

c=None '

现在实现create_resources的案例。

production.pp

node default {

  $foo_params = { foo => { a => 'alan', b => 'bill', c => 'carl' } }

  create_resources('class', $foo_params)

}

结果关键部分如下：

a=alan

b=bill

c=carl 

具体解释 Converts a hash into a set of resources and adds them to the catalog.