SysAdmin

When MAT UI fails to handle very large heap dumps, the Memory Analyzer CLI provides a reliable alternative on Linux. This post walks through the setup and commands needed to parse multi-gigabyte dumps and generate shareable HTML reports.

An overview of how Docker’s built-in DNS resolver enables container-to-container communication and service discovery. Covers default configurations, custom DNS setups, and practical use cases.

Multiple Content-Security-Policy headers do not combine; the most restrictive one always wins. Learn how to correctly configure CSP in nginx by consolidating directives into a single header.

A plain-English walkthrough of how SAML authentication works, using the analogy of buying a beer at a concert. Covers IdP and SP configuration, IdP-initiated vs SP-initiated flows, and practical troubleshooting steps.

Configure a legacy SysV init script to wait for network availability in RHEL 7 by adding the Required-Start LSB directive. This guide shows how systemd honors those headers so third-party initscripts start in the correct order.

Learn how to safely override systemd unit and timer files using systemctl edit, avoiding the pitfalls of editing package-managed files directly. Covers creating drop-in overrides, full replacements, and reverting changes.