TLS Certificates for Internal Services Done Right: A Comprehensive Guide for Secure DevOps

Short summary

Secure internal service-to-service communication by implementing a private PKI with root and intermediate CAs. The guide covers certificate lifecycle automation, zero-trust architecture, and practical tools like Vault and Smallstep for managing TLS at scale without relying on public CAs.

• •Internal services require their own PKI separate from public CAs to avoid scale costs and enable organizational trust boundaries
• •Automation via CI/CD integration prevents manual errors and enables certificate renewal at scale
• •HashiCorp Vault and Smallstep step-ca provide production-ready solutions for Kubernetes and microservices environments

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