SOA_EN Encrypting an RDS DB instance – Step Functions version
Step Function is used to build a method for encrypting RDS DB instances with CloudFormation.
EC2(Linux)
SOA_EN 
AWS_EN Mix on-demand/spot instances in EC2 Auto Scaling Group
Learn how to mix on-demand/spot instances in an EC2 Auto Scaling group using CloudFormation.
SAA_EN Three ways to start/stop EC2 instances periodically
Here are three ways to use CloudFormation to start/stop EC2 instances on a regular basis.
AWS_EN Aurora Serverless v2 creation using CloudFormation
Learn how to create Aurora Serverless v2 using CloudFormation.
SOA_EN Use S3 bucket policy to allow or deny access on an address basis – aws:SourceIp
Use CloudFormation to build a configuration to allow or deny access on an address basis (aws:SourceIp) using an S3 bucket policy.
AWS_EN Restrict access to ALB to via CloudFront
Learn how to use CloudFormation to limit access to the ALB to via CloudFront.
SAA_EN Specify ALB as the origin of CloudFront
Learn how to use CloudFormation to specify ALB as the CloudFront origin.
AWS_EN Connect to RDS from EC2 (Linux)/Lambda using IAM authentication
How to connect to RDS from EC2 (Linux)/Lambda with IAM authentication using CloudFormation.
SAA_EN Two ways to access DynamoDB from private subnets
Two ways to access DynamoDB from private subnets using CloudFormation.
DVA_EN Scaling based on CloudWatch custom metrics – number of connections version
Learn how to scale based on CloudWatch custom metrics (number of user connections) using CloudFormation.