Confidential Containers on Kubernetes: Running Encrypted Workloads

\n## 🔒 Computing on Encrypted Data

Confidential containers run workloads in hardware-encrypted enclaves. Even the cloud provider or cluster administrator can’t see the data being processed. For AI workloads handling sensitive data — medical records, financial data, PII — this is a game-changer.

How It Works

Confidential computing uses CPU hardware features:

• AMD SEV-SNP: Encrypts entire VM memory with per-VM keys
• Intel TDX: Trust Domain Extensions for VM-level isolation
• ARM CCA: Confidential Compute Architecture (emerging)

The CPU encrypts memory transparently. No code changes needed.

Kubernetes Integration

Confidential Containers Operator

# Install the operator
kubectl apply -f https://github.com/confidential-containers/operator/releases/download/v0.10.0/deploy.yaml

# Create a runtime class
kubectl apply -f - <<EOF
apiVersion: node.k8s.io/v1
kind: RuntimeClass
metadata:
  name: kata-cc
handler: kata-cc
overhead:
  podFixed:
    memory: "256Mi"
    cpu: "250m"
scheduling:
  nodeSelector:
    cc.kata/enabled: "true"
EOF

Deploy a Confidential Pod

apiVersion: v1
kind: Pod
metadata:
  name: confidential-inference
  annotations:
    io.katacontainers.config.hypervisor.firmware: "OVMF_CODE.cc.fd"
spec:
  runtimeClassName: kata-cc
  containers:
  - name: inference
    image: registry.internal/ai-inference:v1.0
    resources:
      limits:
        memory: "4Gi"
        cpu: "2"
    env:
    - name: MODEL_ENCRYPTION_KEY
      valueFrom:
        secretKeyRef:
          name: model-key
          key: encryption-key

Use Cases for AI/ML

1. Multi-party ML training: Train on combined datasets without any party seeing the other’s data
2. Confidential inference: Process sensitive queries (medical, legal, financial) without exposing data to the infrastructure operator
3. Model IP protection: Protect proprietary model weights from extraction by the hosting environment
4. Regulatory compliance: Meet GDPR/HIPAA requirements for data processing

Attestation: Proving Trust

Remote attestation verifies the hardware is genuine and the software is unmodified:

import requests

def verify_attestation(attestation_report):
    # Verify with AMD/Intel attestation service
    result = requests.post(
        "https://attestation.amd.com/verify",
        json={"report": attestation_report}
    )
    
    if result.json()["trusted"]:
        # Safe to send sensitive data
        return send_encrypted_data()
    else:
        raise SecurityError("Attestation failed")

Current Limitations

• GPU support: Limited — NVIDIA H100 supports confidential computing, older GPUs don’t
• Performance overhead: 2-15% depending on workload (mostly memory encryption)
• Node requirements: Specific CPU models (AMD EPYC 7003+ or Intel Xeon 4th gen+)
• Debugging: Harder to debug — by design, you can’t inspect memory

Getting Started

1. Check your hardware — AMD SEV-SNP or Intel TDX support required
2. Start with non-GPU workloads — data processing, API services
3. Implement attestation — verify the TEE before sending sensitive data
4. Plan for H100 nodes — if you need confidential GPU computing

Confidential containers are moving from experimental to production-ready. For regulated industries processing sensitive data, this is no longer optional — it’s becoming expected.

Need confidential computing for your AI workloads? I help organizations deploy secure, privacy-preserving infrastructure. Get in touch.\n