Troubleshooting

Learn how to capture, read, and interpret Java thread dumps using JDK tools like jstack and jcmd. Covers thread states, CPU analysis, deadlock detection, and practical tools for spotting performance issues.

A quick fix for the ’not enough storage available’ error when running jstack on Windows, caused by the JVM running under the Local System Account. Two workarounds using Psexec or JMX remote monitoring.

A practical guide to using the jcmd and jstack utilities for collecting thread dumps, heap data, and CPU information from a running JVM process. Includes ready-to-use scripts and one-liners for troubleshooting slow or hung Java applications.

A practical guide to configuring CPU, memory, and storage requests and limits in Kubernetes, covering container-level, Pod-level, and namespace-level resource controls. Includes troubleshooting steps for common scheduling and OOM issues.

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.