System Design Patterns: From Fundamentals to Real Systems
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Service Mesh

1. The Incident

The sidecar rollout succeeded. 440 proxies run beside 440 instances, and every service speaks with the same 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 makes rotation, replacing each certificate before it expires, a standing chore. The quarter it slips, checkout-to-inventory dies at 2 AM with certificate expired

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