A list of availability zones to use in the region. An empty list selects all available zones. Note: Changing the order of zones will result in the cluster being rebuilt. Appending to the list will not affect existing resources.
Set the size of the subnet CIDR blocks. Subnets are spanned across availability zones, and the total size of all the subnets must fit within the VPC’s CIDR block (10.0.0.0/16).