Modify the stack--CloudFormation

Now, we will modify/update the stack. For modifying, we will use the same template and add one more subnet into the VPC. CloudFormation provides two methods for modifying your stack:

1. Direct update:
   • When you submit the changes, CloudFormation deploys them immediately
   • You want to have a quick update on the stack
   • Works well when you are sure of the changes
2. Change sets:
   • Will allow you to preview the changes
   • Will not make the changes until you execute the change set
   • Provides a JSON formatted document to summarize the changes
   • Creates multiple change sets of different changes by providing a modified template

Getting ready

Before going forward into this recipe, make sure you know how you want...