System Architecture is a Bit About Paranoia

Short summary

A 20-year systems veteran argues that architecture requires 'paranoia'—anticipating worst-case scenarios and building defenses against them. Concrete lessons from production incidents: resource monitoring prevents OOM cascades and disk-full lockouts; redundancy enables fast recovery; proactive security (CVE tracking, kernel hardening) stops attacks before they start. Trade-offs between content freshness and caching performance must be made consciously.

• •Resource monitoring is critical: OOM and disk-full errors cascade through entire systems
• •Build for graceful failure: redundancy, fast recovery, and fault tolerance matter more than preventing every error
• •Security is a systems problem: proactive hardening (CVE tracking, kernel module blacklisting) prevents incidents better than reaction

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