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observations.md

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  • What formats to use for templates?
  • Keep the template reference handy
  • About properties for a resource type: Required, Type, and Update requires
  • What intrinsic functions (like Fn::Join) were used?
  • What pseudo-parameters were used?
  • How is UserData used? Review the use of cfn-init together with Metadata?
  • What is the stack lifecycle? How is a stack updated?
  • What options are available during stack creation (and other actions on a stack)?
    • Troubleshooting stack failures using --on-failure
  • Why was the instance replaced when a security group was assigned?
  • Using Outputs to obtain information on stack resources
  • What happens when resources are modified outside of the stack?
  • On the implicit use of default VPC to deploy resources

Errors and troubleshooting

  • Error: Failed to create the stack since the default instance type m3.medium was not available in the specified region

When the InstanceType is not specified for a resource of type AWS::EC2::Instance, the default is m3.medium. However, instances of this type may not be available, say, in newer AWS regions