System Design Patterns: From Fundamentals to Real Systems
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Service Mesh

1. The Incident

The sidecar rollout succeeded, placing 440 proxies beside 440 service instances with consistent networking mechanics. Six months later, the platform team faces a different problem: coordinating all their configuration.

Certificates. Mutual TLS requires every sidecar to hold a certificate, and those certificates expire. Rotating 440 certificates every 90 days becomes a permanent manual responsibility. One missed quarter can stop checkout from calling inventory at 2 AM with `certificate expired

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