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I have encountered a similar issue. Admission controllers(mutating/validating) and kube-apiserver only communicate over HTTPS. The admission controller needs TLS certs.
I have few solutions to this problem that don't come natively with EKS but you can use Open source solutions
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Use Cert-manager (X.509 certificate management for Kubernetes) ; cert-manager is a certificate management controller that can run on EKS. cert-manager will issue certificates from Let’s Encrypt, HashiCorp Vault, Venafi, a simple signing key pair, or self signed. Big benefit is it will ensure certificates are valid and up to date, and attempt to renew certificates at a configured time before expiry
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An open source tool called k8s-webhook-cert-manager can also be used in this scenario Link: https://github.com/newrelic/k8s-webhook-cert-manager
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Another open source tool is available which is based on the above tool called k8s-webhook-certificator Link: https://github.com/Trendyol/k8s-webhook-certificator
I would recommend using cert-manager on EKS which is a CNCF project. If not other 2 tools mentioned.
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