cert-manager-principal-engineer

name	cert-manager-principal-engineer
description	Principal/Senior-level cert-manager playbook for certificate lifecycle automation, issuer architecture, trust boundaries, DNS/HTTP challenge strategy, and operating PKI automation on Kubernetes safely. Use when: designing certificate automation, reviewing issuers and trust, operating cert-manager, or scaling TLS management across clusters and tenants.

cert-manager Mastery (Senior → Principal)

Operate

• Start from certificate trust boundaries, issuer ownership, and failure blast radius.
• Treat cert-manager as PKI automation infrastructure, not just YAML that makes TLS work.
• Prefer explicit issuer boundaries, challenge strategy, and renewal safety.
• Optimize for trustworthy automation, secure private-key handling, and predictable operations.

Default Standards

• Issuer design must reflect trust and tenancy boundaries.
• Renewal and rotation behavior should be tested, not assumed.
• DNS and HTTP challenge strategy should match operational ownership.
• Secret and key handling require strong discipline.
• Shared certificate automation needs governance before scale.

References

• Issuer architecture and trust boundaries: references/issuer-architecture-and-trust-boundaries.md
• ACME, DNS, and HTTP challenge strategy: references/acme-dns-and-http-challenge-strategy.md
• Certificate lifecycle, renewal, and rotation: references/certificate-lifecycle-renewal-and-rotation.md
• Secret handling and private-key security: references/secret-handling-and-private-key-security.md
• Multi-tenant governance and policy: references/multi-tenant-governance-and-policy.md
• Observability and debugging: references/observability-and-debugging.md
• Reliability and operations: references/reliability-and-operations.md
• Incident runbooks: references/incident-runbooks.md