Technology

A quick reference covering commonly used kubectl commands, flags, and workflows for managing Kubernetes resources. Topics range from shell autocomplete and cluster contexts to creating, viewing, updating, and deleting resources.

A practical reference for pgBackRest backup, restore, and cleanup commands for PostgreSQL. Covers manual cleanup, incremental backups, retention policies, and stanza management.

A practical walkthrough of reading node_cpu_seconds_total from the Prometheus Node exporter, calculating per-second rates, and deriving overall CPU utilization percentages across multiple machines.

A practical guide to the docker exec command, covering background execution, environment variables, interactive sessions, and working directory control. Includes real-world examples to help you get the most out of running commands inside containers.

An overview of the key components that make up a Kubernetes cluster, covering both the control plane and worker nodes. Understanding these pieces is essential for operating and troubleshooting a Kubernetes environment.

A time sequence diagram walks through the sequential steps of pod scheduling in Kubernetes, from the initial kubectl command to the kubelet reporting status back to the API server. The diagram simplifies concurrent control plane and worker node processes into a clear, ordered flow.