Automated Certificate Management: ACME and Auto-Renewal

Certificate expiry outages often occur not because renewal was absent but because renewed certificates were not deployed, services were not reloaded, or monitoring checked files or jobs rather than the certificate clients actually received. The need for end-to-end automation is increasing as publicly trusted TLS certificate lifetimes fall to 200 days in 2026, 100 days in 2027, and 47 days in 2029, with shorter domain-validation reuse periods requiring frequent automated validation. The text describes ACME as the standard protocol for automated issuance and renewal, explains HTTP-01 validation for publicly reachable web servers and DNS-01 for wildcard, internal, or CDN-backed services, and notes that deployment remains outside ACME and must explicitly reload certificate-consuming services. It highlights cert-manager for declarative Kubernetes certificate management, Certbot deploy hooks and external endpoint checks for conventional hosts, and zero-touch options in Caddy, Traefik, cloud certificate services, and HAProxy. It recommends maintaining a certificate inventory, testing renewals and reloads, monitoring live endpoints for served-certificate expiration, limiting DNS credentials, and centralizing policy, discovery, alerting, and private-CA operations as fleets grow. Infisical is presented as one platform that can provide centralized certificate profiles, private CA issuance, ACME compatibility, agent-based deployment and reload hooks, inventory, and expiry alerts across mixed environments.

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