If the full error explicitly names failed RDB snapshots and stop-writes-on-bgsave-error, inspect persistence evidence before rebuilding network connections. Do not treat every configuration error sharing the short MISCONF label as the same incident.
redis-cli INFO persistence
redis-cli INFO memoryThese are read examples for your own Redis instance using its required authentication and TLS settings. Do not put passwords in command arguments or shared logs. Correlate rdb_last_bgsave_status, any save in progress and server logs at the same time. A last-save timestamp alone does not prove that a newly attempted save succeeded.
Separate destination failures from fork failures
For permission denied, align the container-side persistence path, runtime identity and host mount. For space errors, check free bytes, inodes and read-only remounts. For a fork failure, inspect memory, cgroup limits and contemporaneous logs. Repeating chown for a fork problem or adding RAM for a permission problem misses the failing boundary.
Redis’s MISCONF explanation covers write blocking following persistence failure. Disabling write protection may remove a client error without restoring disk persistence. A service that requires persistence must record that distinction explicitly.
Assess recovery after a new persistence result
After correcting the cause, observe the next save through the administration procedure and align status, completion time and logs. BGSAVE is not a read-only diagnostic; fork and copy-on-write can burden a small host. Do not launch repeated concurrent saves. Distinguish reads, an approved small write and persistent storage verification; test restart recovery separately in staging.