DevOps & CI/CD

Zero-Egress Kubernetes Pod Network Policy

DevOps & CI/CD diagram · made in Skemio

Kubernetes network architecture diagram showing untrusted pod traffic blocked by CNI filter, while whitelisted egress routes to CoreDNS, internal API, and managed DB.
Kubernetes network architecture diagram showing untrusted pod traffic blocked by CNI filter, while whitelisted egress routes to CoreDNS, internal API, and managed DB.
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What it shows

  • Default-allow networking enables attackers to exfiltrate data after RCE
  • Block all egress first; explicitly permit internal CoreDNS on UDP/TCP port 53
  • Whitelist database and cloud API endpoints by exact CIDR and namespace labels

The takeaway

Enforce default-deny egress policies per namespace to contain compromised containers instantly.

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