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---
tags:
- puppet
references:
- https://www.puppet.com/docs/puppet/7/lang_classes#lang_class_declare
---
Prefer include over resource-like; more flexible and idempotent. Resource-like to pass args without needing to use hieradata.
> Mixing declaration types for the same class can lead to compilation errors.
# Include-like <- preferred
Relies on external data, e.g hieradata, and defaults.
Idempotent: it is only added to the catalog once.
### `include`
Accepts: single class, class reference (`Class[..]`), comma-seperated list of those or an array of them.
## `require`
Same as above - but the class becomes a dependency of the container. #clarify dependency.
## `contain`
Adheres to same rules as above. Relationships of the containing class extend to the contained class.
See [[Containment]].
# Resource-like
Can be declared only once.
Must be unique to avoid conflicting parameter values.
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