The DevOps category on Voxfor features guides and resources designed to help professionals automate and streamline software development processes. It includes tutorials on tools, techniques, and best practices for improving workflow, infrastructure management, and continuous integration/deployment (CI/CD), catering to both developers and operations teams.
An illustrative JetStream incident snapshot can look contradictory: num_pending is 18,240, num_ack_pending is fixed at 64, and num_redelivered is 27. One dashboard may call all three values “consumer lag,” but they describe different ownership states. Pending messages have not reached a worker. Ack-pending messages are already held ...
A Docker healthcheck reports whether its command succeeds. It does not stop the container, replace it, or activate a restart policy by itself. Restart policies wait for the container's main process to terminate—or for Docker's own lifecycle to change—so an unhealthy container can remain Up indefinitely.
That separation ...
An nginx access log records status 499 when the downstream client closes its connection before nginx can finish the response. The number tells you who stopped waiting from nginx's point of view; it does not yet tell you why they left or which component was slow.
That distinction ...
HAProxy marks a backend server DOWN when its configured health-check contract fails often enough. That result does not, by itself, prove the application is unavailable to every client. A direct browser request may use another hostname, port, protocol, network path, source address, TLS identity, HTTP method, URI, ...
Grafana No Data means a rule query completed but returned no points. Error means the evaluation failed, timed out, or exhausted its configured attempts. A third case, Missing Series, means one previously seen label set disappeared while other series still returned data. Treating all three as “the ...
Kafka consumer lag is not one queue waiting behind one worker. Lag belongs to a consumer group, topic and partition, so a modest group total can hide a single partition that is hours behind while every neighboring partition is current. Start by capturing committed offsets, log-end offsets ...
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 ...
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 ...
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 ...
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