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Security · Devops / AGENT SKILL
mtls-configuration
0
Configure mutual TLS and certificate management for secure service-to-service communication.
Configure mutual TLS (mTLS) for zero-trust service-to-service communication. Use when implementing zero-trust networking, certificate management, or securing internal service communication.
Understand the trade-offs.
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Original instructions from the publisher’s SKILL.md
# 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