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AWS tech support sent me an answer. Although MinLength is not supported on AvailabilityZone::Name, AllowedPattern is. Here is a pattern that ensures the AvailabilityZone::Name is at least 1 character long. Since this is a popup field it ensures that the popup is populated and not left blank.
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AvailabilityZone:
Type: AWS::EC2::AvailabilityZone::Name
Description: EC2 AvailabilityZone
AllowedPattern: ".+" # -> to have a non blank value
FYI: Using a DefaultValue is not really an option since I don't know what Region the script is being run in.
답변함 4년 전