For a summary of the update workflow, see How Does AWS Cloud Formation Work? Note When updating a stack, AWS Cloud Formation might interrupt resources or replace updated resources, depending on which properties you update.
For more information about resource update behaviors, see Update Behaviors of Stack Resources. When you directly update a stack, you submit changes and AWS Cloud Formation immediately deploys them.
When you need to make changes to a stack's settings or change its resources, you update the stack instead of deleting it and creating a new stack.
For example, if you have a stack with an EC2 instance, you can update the stack to change the instance's AMI ID.
When you update a stack, you submit changes, such as new input parameter values or an updated template.
AWS Cloud Formation compares the changes you submit with the current state of your stack and updates only the changed resources.
Change sets are JSON-formatted documents that summarize the changes AWS Cloud Formation will make to a stack.
Use change sets when you want to ensure that AWS Cloud Formation doesn't make unintentional changes or when you want to consider several options.
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