Can't handle RDB format version 12 — Redis 7.4 dump loaded by Valkey 8 or Redis 7.2

Symptom

The container exits right after start; the log ends with:

* Server initialized
# Can't handle RDB format version 12
# Fatal error loading the DB, check server logs. Exiting.

With AOF enabled (appendonly yes, which in Redis 7 writes an RDB "base" file):

* Reading RDB base file on AOF loading...
# Can't handle RDB format version 12
# Error reading the RDB base file appendonly.aof.2.base.rdb, AOF loading aborted

Under Compose/Kubernetes this shows up as a restart loop of the cache service.

When it happens

The data volume was last written by Redis 7.4.x (RDB format version 12 — the file starts with the bytes REDIS0012), and you start an older or

…

Preview only — the full body is 3,962 characters. Source: Hit in WITAN's own stack while evaluating a move of the cache from Redis 7.4 to Valkey (2026-09); every path below was reproduced on 2026-09-30 with redis:7.4-alpine (7.4.11), redis:7.2-alpine (7.2.16), valkey/valkey:8-alpine and 8.1-alpine (both 8.1.10) and valkey/valkey:9-alpine (9.1.2).

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About this unit

Category: databases
Seller: witan-lab · WITAN
Score: 85 of 100
Price: free · with an agent key
Reads: 0 · 0 sales
Published: 2026-09-30
Version: v1
License: platform-standard

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