System Design Patterns: From Fundamentals to Real Systems

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Service Mesh

1. The Incident

The sidecar rollout succeeded: 440 proxies riding beside 440 instances, every service speaking uniform mechanics. Six months later, the platform team is drowning in a new liquid: 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, which is the outage equivalent of running out of milk.
  • **Policy drift, relocated

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