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Fix Redis Out-Of-Memory Errors and Unexpected Key Eviction

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Self-Hosting & Infra intermediate 7 min read $0.01 Updated 2026-10-18

A diagnostic for Redis memory pressure: read INFO memory, set maxmemory and a matching eviction policy, find big keys and keys without TTLs, understand fork and fragmentation overhead, and separate cache data from durable data.

Redis starts rejecting writes or keys vanish. Check maxmemory and the eviction policy, find the large or immortal keys, and decide whether Redis is a cache or a database before you tune anything.

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#redis#maxmemory#eviction#memory#cache

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