CRE-2025-0176
Redis Persistence Failure - MISCONF Disk Write ErrorsCriticalImpact: 9/10Mitigation: 7/10
Description
Detects Redis MISCONF errors when the server cannot persist data to disk due to RDB/AOF write failures. This critical error prevents Redis from saving snapshots and may lead to data loss on restart.\n
Mitigation
IMMEDIATE ACTIONS:\n- Check disk space: `df -h /var/lib/redis`\n- Review Redis persistence status: `redis-cli INFO persistence`\n- Check last save status: `redis-cli LASTSAVE`\n- Verify file permissions: `ls -la /var/lib/redis/`\n\nRECOVERY:\n- Free disk space:\n ```\n # Clean old logs\n find /var/log -name "*.gz" -delete\n # Remove old backups\n rm /var/lib/redis/dump.rdb.old\n ```\n- Fix permissions:\n `chown redis:redis /var/lib/redis/*`\n- Temporarily disable persistence (RISKY):\n ```\n redis-cli CONFIG SET save ""\n redis-cli CONFIG SET stop-writes-on-bgsave-error no\n ```\n- Force manual save after fixing:\n `redis-cli BGSAVE`\n\nDISK TROUBLESHOOTING:\n- Check disk errors: `dmesg | grep -i error`\n- Verify filesystem: `fsck /dev/sda1`\n- Monitor I/O: `iostat -x 1`\n- Check mount options: `mount | grep redis`\n\nPREVENTION:\n- Monitor disk usage with alerts at 80% capacity\n- Regular disk cleanup automation\n- Separate partition for Redis data\n- Configure appropriate save intervals\n- Use both RDB and AOF for redundancy\n- Regular backup verification\n