Luke Hebert
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Welcome to the articles section, where business, technology, and everyday problem-solving meet. You’ll find practical how-tos, troubleshooting notes from the trenches, and the occasional take on whatever’s happening in the world. Some posts will save you time, some will spark ideas, and a few will just be me thinking out loud. Grab a coffee and dig in.

hostname and hostname -f (Not Getting FQDN) June 27, 2017

hostname and hostname -f (Not Getting FQDN)

When hostname -f returns a short name instead of a fully qualified domain name, the issue usually traces back to the HOSTNAME variable in /etc/sysconfig/network or a misconfigured /etc/hosts entry. Understanding the difference between the gethostname and gethostbyname system calls makes the fix straightforward.
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How to Enable Kerberos Event Logging (Windows) June 27, 2017

How to Enable Kerberos Event Logging (Windows)

Kerberos authentication failures can be tricky to diagnose without detailed logging. This guide walks you through enabling Kerberos event logging on a Windows machine via the registry so you can capture authentication events in the system log.
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Java (JVM) Debugging Tools June 27, 2017

Java (JVM) Debugging Tools

A quick reference for the most useful JVM debugging commands, including heap inspection, environment introspection, and enabling GC logging on a running Java process.
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JDK Breakdowns for Web UI and SPNEGO (u92, u91, u40, u45) June 27, 2017

JDK Breakdowns for Web UI and SPNEGO (u92, u91, u40, u45)

Specific JDK 1.8.0 builds (u40, u45, u91, u92) are known to break SPNEGO authentication and Hadoop web interfaces. This post documents the affected versions, the symptoms, and the recommended downgrade path.
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JVM SSL Debugging in Hadoop June 27, 2017

JVM SSL Debugging in Hadoop

Enable verbose SSL/TLS handshake logging in a JVM running Hadoop or Cloudera services to diagnose certificate and protocol issues.
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Kerberos CLI Debug Tracing & Hadoop June 27, 2017

Kerberos CLI Debug Tracing & Hadoop

A quick reference for enabling verbose Kerberos and Hadoop debug output on the command line, so you can see exactly where authentication is failing.
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