Functions

Some of the Intrinsic functions in CloudFormation

• Fn::GetAtt
  • Get attribute of any resources.
    • AvailabilityZone,
    • DNSName
  • More in the documentation
  • For example: !GetAtt EC2Instance.AvailabilityZone
• Fn::FindInMap
  • Find value of mappings
  • !FindInMap[mapName, TopLevelKey, SecondLevelKey]
• Fn::ImportValue
  • Import values that are exported in other templates
  • !ImportValue SSHSecurityGroup
• Fn::Join
  • Join values with parameters
  • !Join[":", [a,b,c] = "a:b:c"
• Fn::Sub
  • Substitue value within a string
  • String must contain ${VariableName}
• Conditions
  • Fn::And
  • Fn::Equals
  • Fn::If
  • Fn::Not
  • Fn::Or