木偶有迭代和循环吗？ [英] are there iterators and loops in puppet?

问题描述

当我定义（？）一个资源，例如为了确保dir结构，有没有可用的循环？

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

像：

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

我有几十个目录，我真的厌倦了声明它在木偶..它将需要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

在木偶语言中，没有任何循环。

In the puppet language, no there are no loops.

但是您可以使用数组而不是标题的简单字符串，并使用相同的参数声明多个资源：

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,
}

您还可以通过不同的参数声明同一类型的许多资源使用; 结束每个资源，这比重复文件和 { s和} s：

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;
}

在具体的文件中，您可以设置源代码并使用递归：

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

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

（这将需要该木马的目录结构的源代码用作来源）

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

您可以定义新的资源类型多次重用参数的一部分：

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"]: } 

从Puppet 2.6开始，有一个可用的Ruby DSL，具有所有循环功能要求： http://www.puppetlabs.com/blog/ruby-dsl/实验循环，但这些功能可能会改变或在以后的版本中消失。

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.

这篇关于木偶有迭代和循环吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！