Meta parameters
by Thomas Uphillis, Jaime Soriano Pastor, Alessandro Franceschi, Martin Alfke, Feli
Puppet: Mastering Infrastructure Automation
- Puppet: Mastering Infrastructure Automation
- Table of Contents
- Puppet: Mastering Infrastructure Automation
- Puppet: Mastering Infrastructure Automation
- Credits
- Preface
- 1. Module 1
- 1. Writing Your First Manifests
- 2. The Master and Its Agents
- 3. A Peek under the Hood – Facts, Types, and Providers
- 4. Modularizing Manifests with Classes and Defined Types
- 5. Extending Your Puppet Infrastructure with Modules
- An overview of Puppet's modules
- Maintaining environments
- Building a specific module
- Naming your module
- Making your module available to Puppet
- Implementing basic module functionality
- Creating utilities for derived manifests
- Enhancing the agent through plugins
- Enhancing Puppet's system knowledge through facts
- Refining the interface of your module through custom functions
- Making your module portable across platforms
- Finding helpful Forge modules
- Summary
- 6. Leveraging the Full Toolset of the Language
- 7. New Features from Puppet 4
- 8. Separating Data from Code Using Hiera
- 2. Module 2
- 1. Puppet Essentials
- The Puppet ecosystem
- Puppet components
- Installing and configuring Puppet
- Puppet in action
- Variables, facts, and scopes
- Meta parameters
- Managing order and dependencies
- Reserved names and allowed characters
- Conditionals
- Comparison operators
- Iteration and lambdas
- Exported resources
- Modules
- Restoring files from a filebucket
- Summary
- 2. Managing Puppet Data with Hiera
- 3. Introducing PuppetDB
- 4. Designing Puppet Architectures
- 5. Using and Writing Reusable Modules
- 6. Higher Abstraction Modules
- 7. Puppet Migration Patterns
- 8. Code Workflow Management
- 9. Scaling Puppet Infrastructures
- 10. Extending Puppet
- 11. Beyond the System
- 12. Future Puppet
- 1. Puppet Essentials
- 3. Module 3
- 1. Dealing with Load/Scale
- 2. Organizing Your Nodes and Data
- 3. Git and Environments
- 4. Public Modules
- 5. Custom Facts and Modules
- 6. Custom Types
- 7. Reporting and Orchestration
- 8. Exported Resources
- 9. Roles and Profiles
- 10. Troubleshooting
- A. Bibliography
- Index
Meta parameters are general-purpose parameters available to any resource type, even if not explicitly defined. They can be used for different purposes:
- Manage dependencies and resources ordering (more on them in the next section):
before,require,subscribe,notify, andstage - Manage resources' application policies:
audit(audit the changes done on the attributes of a resource),noop(do not apply any real change for a resource),schedule(apply the resources only within a given time schedule), andloglevel(manage the log verbosity) - Add information to a resource:
alias(adds an alias that can be used to reference a resource) andtag(add a tag that can be used to refer to group resources according to custom needs; we will see a usage case later in this chapter in the external resources section)
-
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