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DNS Security in Kubernetes

CoreDNS is Kubernetes’ default DNS provider. Securing it prevents DNS-based attacks like spoofing and cache poisoning.

Best Practices for DNS Security

1. Restrict External DNS Access

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: block-dns-egress
spec:
  podSelector:
    matchLabels:
      app: sensitive-app
  policyTypes:
    - Egress
  egress:
    - to:
        - namespaceSelector: {}
          podSelector:
            matchLabels:
              k8s-app: kube-dns

2. Enable DNS-over-TLS (DoT)

Encrypt DNS queries to prevent interception.
Use Knot Resolver or CoreDNS plugins for DoT support.

3. Monitor CoreDNS Logs

Enable logging to detect suspicious DNS queries.

DNS security is critical to preventing DNS-based threats and securing Kubernetes service discovery.

Best Practices for DNS Security