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DevOps
Terraform to OpenTofu: Test State Before Switching
Replacing the terraform executable with tofu is easy. Proving that the new engine can read the same configuration, providers and state without…
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DevOps.
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.
The knowledge library
60 articles · Page 2Articles & guides
DevOps
Containers and Virtual Machines Draw Different Isolation Boundaries
A container image and a virtual disk can both make software portable, yet they do not put the same boundary around that…
DevOps
Secondary DNS Resilience Needs More Than Extra Name Servers
Four name servers appear in a domain’s delegation. A provider outage begins, and all four stop answering at once. Nothing contradictory happened:…
DevOps
Kubernetes Ingress to Gateway API: A Parallel Cutover Plan
On March 24, 2026, the ingress-nginx project was retired. Existing controllers did not suddenly stop routing traffic, but retirement ended releases, bug…
DevOps
WHMCS Cron Ran but Daily Automation Did Not Finish
Cron Job: Started proves that WHMCS began a run. It does not prove that invoice generation, payment capture, usage polling, suspensions, notices…
DevOps
Envoy 503 UO: Find the Circuit Breaker That Opened
An Envoy access log with HTTP 503 and response flag UO records a local upstream-overflow decision. Envoy's circuit breaker refused the request;…
DevOps
Nextcloud Cron Can Be Healthy While Background Jobs Run Late
A green cron indicator proves that Nextcloud recently received a trigger; it does not prove that every due background job finished on…
DevOps
Kubernetes DiskPressure: Find the Filesystem Kubelet Sees
Kubernetes sets DiskPressure=True when available bytes or free inodes cross a kubelet eviction threshold on nodefs, imagefs, or containerfs. That condition does…
DevOps
Why Does OpenTelemetry Collector OOM During a Backend Outage?
An OpenTelemetry Collector can run out of memory during a backend outage because exporter queues retain telemetry as live objects while new…
DevOps
NATS JetStream Redelivery Is Not the Same as Consumer Lag
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…
DevOps
Docker Healthchecks Report Failure; Restart Policies Wait for Exit
A Docker healthcheck reports whether its command succeeds. It does not stop the container, replace it, or activate a restart policy by…
DevOps
nginx 499 Means the Client Left Before the Server Replied
An nginx access log records status 499 when the downstream client closes its connection before nginx can finish the response. The number…
DevOps
HAProxy Backend DOWN: Separate Probe Failure from Service Failure
HAProxy marks a backend server DOWN when its configured health-check contract fails often enough. That result does not, by itself, prove the…
DevOps
Grafana No Data and Error Need Different Alert Policies
Grafana No Data means a rule query completed but returned no points. Error means the evaluation failed, timed out, or exhausted its…
DevOps
Kafka Consumer Lag Can Belong to One Hot Partition
Kafka consumer lag is not one queue waiting behind one worker. Lag belongs to a consumer group, topic and partition, so a…
DevOps
When etcd Raises NOSPACE, Compact Before You Defragment
An etcd NOSPACE alarm means at least one member's backend crossed its configured quota, so the cluster entered limited-operation maintenance mode. Reads…
DevOps
Immich Backups Need More Than the Automatic Database Dump
Immich can create automatic PostgreSQL dumps, but those files do not contain the photos and videos people expect to recover. A usable…
DevOps
Docker Build Cache Is Filling Your VPS: Reclaim Space Safely
If repeated Docker builds are consuming VPS storage, do not begin with a system-wide prune. First prove that BuildKit owns the missing…
DevOps
Which Prometheus Label Is Multiplying Your Time Series?
A Prometheus server can run out of memory even when scrape traffic, retention and disk use look ordinary. The hidden multiplier is…
DevOps
A RabbitMQ Disk Alarm Can Block Every Publisher
A RabbitMQ node can be running, answering health checks and delivering messages to consumers while every publishing connection is stalled. That split…
DevOps
Before You Drain a Kubernetes Node, Prove the Workload Can Move
A Kubernetes node drain is safe only when the workload can complete four separate moves: the Eviction API may remove the Pod,…
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