How to force complete recreation of custom resource during stack updates?

Question

I have a CF template with a custom resource (backed by a lambda function).

I would like this custom resource to be deleted and the newly created when I update my stack. How can I achieve this?

To make this practical, let's assume I have a custom resource which simply produces a random string.
More or less as described here:

https://www.itonaut.com/2018/01/03/generate-passwords-in-aws-cloudformation-template/

So I have a resource like:

  RandomSuffix:
    Type: AWS::CloudFormation::CustomResource
    DeletionPolicy: Delete
    Properties:
      Length: 3
      ServiceToken: !ImportValue
        'Fn::Sub': 'cf-utils-RandomStringFunction-Arn'

In general, this works, I get some random string as RandomSuffix.Value.

However, after an update, this values stays the same.

Is there any way to force deletion and recreation of my custom resource during update?

Tim Bassett Tim Bassett · Accepted Answer · 2019-12-11T02:08:51

1

votes

You need to change it's name. e.g. RandomSuffix=>RandomSuffix20191210

How to force complete recreation of custom resource during stack updates?

1 Answers