Mtls Configuration

mTLS Configuration

Comprehensive guide to implementing mutual TLS for zero-trust service mesh communication.

When to Use This Skill

• Implementing zero-trust networking
• Securing service-to-service communication
• Certificate rotation and management
• Debugging TLS handshake issues
• Compliance requirements (PCI-DSS, HIPAA)
• Multi-cluster secure communication

Core Concepts

1. mTLS Flow

┌─────────┐                              ┌─────────┐│ Service │                              │ Service ││    A    │                              │    B    │└────┬────┘                              └────┬────┘     │                                        │┌────┴────┐      TLS Handshake          ┌────┴────┐│  Proxy  │◄───────────────────────────►│  Proxy  ││(Sidecar)│  1. ClientHello             │(Sidecar)││         │  2. ServerHello + Cert      │         ││         │  3. Client Cert             │         ││         │  4. Verify Both Certs       │         ││         │  5. Encrypted Channel       │         │└─────────┘                              └─────────┘

2. Certificate Hierarchy

Root CA (Self-signed, long-lived)    │    ├── Intermediate CA (Cluster-level)    │       │    │       ├── Workload Cert (Service A)    │       └── Workload Cert (Service B)    │    └── Intermediate CA (Multi-cluster)            │            └── Cross-cluster certs

Templates and detailed worked examples

Full template library and detailed worked examples live in references/details.md. Read that file when you need the concrete templates.

Best Practices

Do's

• Start with PERMISSIVE - Migrate gradually to STRICT
• Monitor certificate expiry - Set up alerts
• Use short-lived certs - 24h or less for workloads
• Rotate CA periodically - Plan for CA rotation
• Log TLS errors - For debugging and audit

Don'ts

• Don't disable mTLS - For convenience in production
• Don't ignore cert expiry - Automate rotation
• Don't use self-signed certs - Use proper CA hierarchy
• Don't skip verification - Verify the full chain