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We have an issue tracking additional security groups for node groups in <https://github.com/pulumi/pulumi-eks/issues/275>, but not additional ones for the cluster. That said, you can pass in your own `clusterSecurityGroup` as you pointed out.
What is your use case for providing more security groups to the cluster? Generally speaking, the cluster security group should be primarily locked down to only the nodes.

the use case is that we have sgs that are specific to purpose and we want to institute scanning that ensures they exist

at the moment we're having to copy rules from those sg's to a single sg