Puppet

这是本文档旧的修订版！

自定义fact实现的四种方式介绍

Resources and the RAL

Resources: Imagine a system’s configuration as a collection of many independent atomic units; call them “resources.”
- 资源可分类
- 资源类型描述抽离于它的具体操作步骤
- Puppet 指定资源的期望状态，而不是直接指定具体操作
- 以上三点组成 Puppet 的资源抽象层（RAL）， RAL 包括 types（高级别抽象模型）和 providers（平台相关实现），这样可以使用平台无关的方式来描述资源得期望状态。

每个资源（Resource ）的描述包括： resource type, one title, a number of attributes, each attribute has a value

    user { 'dave':
      ensure     => present,
      uid        => '507',
      gid        => 'admin',
      shell      => '/bin/ksh',
      home       => '/home/dave',
      managehome => true,
    }

This syntax is called a resource declaration

Resource Types : puppet_core_types_cheatsheet.pdf, the type references
puppet describe : The puppet describe subcommand can list info about the currently installed resource types on a given machine.
puppet resource: Puppet includes a command called puppet resource, which can interactively inspect and modify resources on a single system. Usage:
```
# puppet resource <TYPE> [<NAME>] [ATTRIBUTE=VALUE ...]
```

Manifests

.pp: Puppet programs are called “manifests,” and they use the .pp file extension.
完整语法链接： lang resources
- 大括号，冒号，逗号要正确
- 大小写敏感。类型（type）和属性（attributes）名必须小写
- 字符串值的书写: datatypes
- All types have a special attribute called the namevar, 该属性缺失就默认以 title 替代
Before being applied, manifests get compiled into a document called a catalog
puppet apply <.pp file >
Puppet agent/master

Resource Ordering

You can embed relationship information in a resource with the before, require, notify, and subscribe metaparameters.
You can also declare relationships outside a resource with the → and ~> chaining arrows.
Relationships can be either ordering (this before that) or ordering-with-notification (this before that, and tell that whether this was changed).
Puppet’s relationship behaviors and syntaxes are documented in the Puppet reference manual page on relationships.
The ordering setting in puppet.conf determines the order in which unrelated resources are applied.

Puppet

facter

Learning Puppet 笔记

Resources and the RAL

Manifests

Resource Ordering

Oakfire Wiki