有没有迭代器和循环傀儡？ [英] are there iterators and loops in puppet?

问题描述

当我定义（？）的资源如确保目录结构，是否有任何可用的循环？

When I define(?) a resource e.g. to ensure dir structure, are there any loops available?

像这样：

  for X in [app1,app2] do:
    file { '/opt/app/' + X:
      ensure => directory,
      owner  => 'root',
      group  => 'root',
      mode   => '0644',
    }

我有几十目录，我用木偶宣布它真的累了..这将需要15 LOC的bash。

I have tens of directories and I am really tired with declaring it in puppet.. It would take 15 LOC of bash.

任何想法？

推荐答案

在木偶的语言，没有没有循环。

In the puppet language, no there are no loops.

但是你可以使用一个数组，而不是简单的字符串的称号，并在同一时间以相同PARAMS声明多个资源：

But you can use an array instead of a simple string for the title and declare several resources at the same time with the same params:

$b = '/opt/app'
file { [ "$b/app1", "$b/app2" ]:
  ensure => directory,
  owner  => 'root',
  group  => 'root',
  mode   => 0644,
}

您也可以通过结束与每个资源申报同一类型的不同则params的许多资源; ，这是不是重复的<$ C $更紧凑一点C>文件和 {和} 取值：

You can also declare many resources of the same type with different params by ending each resource with a ;, which is a bit more compact than repeating the file and the {s and }s:

file {
  [ "$b/app1", "$b/app2" ]:
    ensure => directory,
    owner  => 'root',
    group  => 'root',
    mode   => 0755;
  [ "$b/app1/secret", "$b/app2/secret" ]:
    ensure => directory,
    owner  => 'root',
    group  => 'root',
    mode   => 0700;
}

在文件中的特定情况下，你可以设置一个来源和使用递归：

In the specific case of files, you can set up a source and use recursion:

file { "/opt/app":
  source => "puppet:///appsmodule/appsdir",
  recurse => true;
}

（这需要具有目录结构的来源傀儡作为源使用）

(that would require having a source of that directory structure for puppet to use as the source)

您可以定义一个新的资源类型重用帕拉姆多次的一部分：

You can define a new resource type to reuse a portion of the param multiple times:

define foo {
  file {
    "/tmp/app/${title}":
      ensure => directory,
      owner  => 'root',
      mode   => 0755;
    "/tmp/otherapp/${title}":
      ensure => link,
      target => "/tmp/app/${title}",
      require => File["/tmp/app/${title}"]
  }
}

foo { ["app1", "app2", "app3", "app4"]: } 

木偶2.6开始，有可用的Ruby的DSL具有所有功能的循环，你可以问： HTTP：/ /www.puppetlabs.com/blog/ruby-dsl/ （我从来没有使用过它，不过）。在木偶3.2，他们推出了一些试验回路的，然而这些特征可变更或消失，在以后的释放。

Starting with Puppet 2.6, there's a Ruby DSL available that has all the looping functionality you could ask for: http://www.puppetlabs.com/blog/ruby-dsl/ (I've never used it, however). In Puppet 3.2, they introduced some experimental loops, however those features may change or go away in later releases.

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