redis persistence_error ai_generated true

MISCONF Redis is configured to save RDB snapshots, but it can't persist to disk

ID: redis/misconf-rdb-snapshots

Also available as: JSON · Markdown
85%Fix Rate
88%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
7 active — — —

Root Cause

Redis cannot save to disk. Disk full, permission error, or insufficient memory for BGSAVE fork.

generic

Workarounds

  1. 92% success Fix the underlying disk/memory issue 
    df -h /var/lib/redis  # check disk; free -m  # check memory for fork

    Sources: https://redis.io/docs/

  2. 88% success Set vm.overcommit_memory=1 for Linux fork behavior 
    echo 1 > /proc/sys/vm/overcommit_memory  # allows Redis BGSAVE fork to succeed
  3. 80% success Use AOF persistence as alternative if RDB fork fails 
    CONFIG SET appendonly yes  # AOF does not require fork for every write

Dead Ends

Common approaches that don't work:

  1. Disable persistence entirely with CONFIG SET save '' 60% fail

    Data will be lost on restart. Only appropriate for pure cache use cases.

  2. Set stop-writes-on-bgsave-error no 72% fail

    Allows writes to continue but data is not being persisted; silent data loss risk