16. CF Deployment Options

When we update a stack, this allow us to see what changes will happen before applying them. It won’t tell us whether the update will be successful.

We can create a ChangeSet when we are creating/updating a stack, an it’ll show the changes.

This will put the stack in a “Review in progress” status, which we can act on in the “Change sets” tab.

If a CF stack fails, it will get to a ROLLBACK_COMPLETE. This means CF tried to create some resources but one failed, so it rolled back all the changed.

This enables CF to rollback stack operations if that operations triggers a CloudWatch Alarm. This alarm can be monitores during:

• Stack create/update.
• The monitoring period from 0 to 180 minutes.

If any of the alarmas goes to the ALARM state, CF will roll back the entire operation.