TLS Certificate Management at Scale: ACME & Let's Encrypt
Automate public key infrastructure: The ACME protocol (RFC 8555), HTTP-01 vs DNS-01 validation challenges, Let's Encrypt 90-day rotation cycles, Kubernetes cert-manager orchestration, OCSP Stapling, and Certificate Transparency logs.
01.1. The Operational Catastrophe of Manual Certificate Renewals
Historically, SSL/TLS certificates were purchased from commercial Certificate Authorities (CAs) for 1 to 2-year terms. System administrators manually created Certificate Signing Requests (CSRs), pasted them into web portals, completed email validation, and copied .pem files onto production servers.
High-Profile Outages Caused by Expired Certificates:
- Microsoft Teams (2020): Global 3-hour outage when an internal authentication certificate expired.
- Spotify (2020): Worldwide streaming disruption caused by an expired TLS certificate on service endpoints.
- Epic Games / Fortnite (2021): Massive multi-hour game launcher outage due to an expired internal wildcard certificate.
The Architectural Lesson: Any security process that relies on human calendar reminders, manual procurement approvals, or manual server file copying is guaranteed to fail at scale.
Automated ACME DNS-01 Certificate Issuance Pipeline 📜
Automated ACME DNS-01 Certificate Issuance Pipeline 📜
Fully automated X.509 certificate issuance and renewal via Kubernetes cert-manager and Let's Encrypt.
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