Stale file handle is an identity error, not a generic network outage. The NFS client is presenting a server-issued handle for a file, directory or export root, but the server can no longer resolve that handle to the object it currently exposes. A remount often gives the ...
A Fail2ban ban can look successful while blocking nothing. Behind Cloudflare or another reverse proxy, the web server may receive the proxy as the TCP peer, recover a visitor address from a trusted header, write that visitor into a log, and then ask a host firewall to ...
An etcd NOSPACE alarm means at least one member's backend crossed its configured quota, so the cluster entered limited-operation maintenance mode. Reads and deletes may still work, but normal writes are rejected. Safe recovery is not “clear the alarm and hope”: preserve quorum and a snapshot, compact ...
Immich can create automatic PostgreSQL dumps, but those files do not contain the photos and videos people expect to recover. A usable Immich backup pairs one database recovery point with the matching originals under UPLOAD_LOCATION, any external-library mounts, and enough deployment information to recreate those paths. Until ...
Do not overwrite active SSH host-key files in one step. Generate replacement keys under new filenames, load old and new identities together, publish the new fingerprints through a trusted channel, and retire the old keys only after every important client class has migrated. That overlap preserves access ...
If repeated Docker builds are consuming VPS storage, do not begin with a system-wide prune. First prove that BuildKit owns the missing space, identify the builder that created it, and inspect which records are reclaimable. A builder-specific prune can then recover eligible cache without deleting named volumes ...
nvidia-smi can show a healthy GPU while an Ollama request still runs partly—or entirely—on CPU. That contradiction does not have one universal cause. The loaded model's PROCESSOR field is the starting evidence: it separates full GPU placement, full CPU placement and a mixed split before you touch ...
A Prometheus server can run out of memory even when scrape traffic, retention and disk use look ordinary. The hidden multiplier is often a label whose values grow with users, request paths, containers, pods, sessions or IDs. Every unique metric name plus complete label set is a ...
Two replicas can both report Seconds_Behind_Source: 0 while only one is current. On the healthy replica, the receiver has fetched the source's latest transaction and the applier has committed it. On the stale replica, a slow receiver may be late to the source while the applier is ...
server reached pm.max_children means a PHP-FPM pool used every permitted child process at least once. It does not prove that the limit is too small. During an active WordPress slowdown, confirm a nonzero listen queue and no idle workers, then use the slow log and request timing ...