System Design Patterns: From Fundamentals to Real Systems
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Service Mesh

1. The Incident

The sidecar rollout succeeded: 440 proxies running beside 440 instances, every service speaking uniform mechanics. Six months later, the platform team is overwhelmed by something new: configuration.

  • Certificates. Mutual TLS means every sidecar holds a certificate, and certificates expire. 440 proxies on 90-day certs means rotation is a standing chore: and the quarter it slips, checkout-to-inventory dies at 2 AM with certificate expired: a fully preventable outage caused by a missed routine task.

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