AWS CloudFormation Concepts Condition Functions

From NovaOrdis Knowledge Base
Jump to navigation Jump to search

External

Condition Functions

Internal

Overview

As it is the case for intrinsic functions, condition functions have a full function name, and a short form. For more details see:

Intrinsic Functions - Overview

Fn::If: !If

Fn::If: function can be used to conditionally specify a property.

Fn::If is only supported in the metadata attribute, update policy attribute, and property values in the Resources section and Outputs sections of a template.

Fn::And: !And

Fn::Equals: !Equals

!Equals ['something', !Ref SomethingElse]

Fn::Not: !Not

Fn::Or: !Or

Expressions

Expressions can use pseudo-parameters, template input parameters and mappings. Expressions are useful when declaring Conditions. Other conditions can be referenced within conditions.