SysAdmin

A practical guide to kubectl JsonPath expressions for extracting, formatting, and combining Kubernetes resource fields. Covers core patterns, array indexing, literal strings, and when to reach for jq instead.

A guide to deploying S3 object storage in Kubernetes using the AWS S3 CSI driver, covering credential setup, StorageClass definition, PVC creation, and volume mounting in pods and deployments.

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.