This article has a few tips for hardening your GKE setup:
1. Network policies.
2. Custom service accounts.
3. Workload identities.
4. Pod Security admissions and admission controllers.
5. GKE sandbox.
More: https://medium.com/@pbijjala/considerations-for-hardening-your-gke-a-workload-perceptive-943be26949d2
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