When should you use the DependsOn attribute in a CloudFormation template?

You can use DependsOn to explicitly specify dependencies, which overrides the default parallelism and directs CloudFormation to operate on those resources in a specified order….DependsOn attribute

1. Resource B is created before resource A.
2. Resource A is deleted before resource B.
3. Resource B is updated before resource A.

What section is required in every CloudFormation template?

A CloudFormation template consists of 6 sections – Description, Parameters, Mappings, Conditions, Resources and Outputs. Only the Resources section is required. However, as a good practice, we highly recommend using all the sections of a template.

Which AWS CloudFormation asset specifies that a resource must wait to be created until after another resource has been created?

When you add a DependsOn attribute to a wait condition, you specify that the wait condition is created only after the creation of a particular resource has completed. When the wait condition is created, AWS CloudFormation begins the timeout period and waits for success signals.

Why would I use parameter files with cloud formation templates?

Use the optional Parameters section to customize your templates. Parameters enable you to input custom values to your template each time you create or update a stack.

Does order matter in CloudFormation template?

When the Resources Have an Implicit Dependency Here, Ref function ensured this, before returning a valid physical id for the security group. Simply, to be able to attach a security group during EC2 instance creation; first of all, that security group should exist.

What is the difference between Elastic Beanstalk vs CloudFormation?

Elastic Beanstalk is intended to make developers’ lives easier. CloudFormation is intended to make systems engineers’ lives easier. Elastic Beanstalk is a PaaS-like layer on top of AWS’s IaaS services which abstracts away the underlying EC2 instances, Elastic Load Balancers, auto-scaling groups, etc.

Which section of a CloudFormation template does not allow for conditions?

According to the docs, Conditions should be used at the top level of the resource you want to conditionally create. Putting a Condition inside the Instance UserData section isn’t supported. To use Conditions in your situation, you’d want separate Resources conditionally created based on the Parameter.

What is the purpose of a wait condition in an AWS CloudFormation template?

Wait Conditions, as the name suggests, is a tool used to control the order of creation of the AWS resources in a CloudFormation stack. It can pause the creation of a stack and wait for a signal to ensure that specific resources and configurations were properly launched before resuming the stack creation process.

Which of the following services rely on CloudFormation to provision resources?

AWS CloudFormation helps model and provision all the cloud infrastructure resources needed for your business. Which of the following services rely on CloudFormation to provision resources (Select two)? AWS Elastic Beanstalk. AWS Serverless Application Model (AWS SAM).

Are CloudFormation parameters case sensitive?

Parameters are separated with a space and the key names are case sensitive. If you mistype a parameter key name when you run aws cloudformation create-stack , AWS CloudFormation doesn’t create the stack and reports that the template doesn’t contain that parameter.

When is the dependson attribute required in CloudFormation?

For more information, see When a DependsOn attribute is required . Override default parallelism when creating, updating, or deleting resources. AWS CloudFormation creates, updates, and deletes resources in parallel to the extent possible.

When should I override default parallelism in AWS CloudFormation?

Override default parallelism when creating, updating, or deleting resources. AWS CloudFormation creates, updates, and deletes resources in parallel to the extent possible. It automatically determines which resources in a template can be parallelized and which have dependencies that require other operations to finish first.

Why does AWS CloudFormation fail to create an API key?

Without this dependency, AWS CloudFormation might create the API key first, which would cause the association to fail because the deployment and stage wouldn’t exist. The following example creates an API key, and enables you to specify a customer ID and whether to create a distinct ID.

What is a CloudFormation resource?

A CloudFormation resource is a description of an AWS resource. It has all the settings for that resources. Resources can depend on other resources, and you can specify this dependency in the template. Ultimately, I want to build an AWS AppSync API for my notes app.