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.

Alternate KRB5.conf Location June 27, 2017

Alternate KRB5.conf Location

Java reads its Kerberos configuration from a fixed set of paths before falling back to the system default. Setting KRB5_CONFIG lets you point a Java application at a custom krb5.conf without touching the OS-level file.
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Are Unix Users Required for Hadoop June 27, 2017

Are Unix Users Required for Hadoop

Hadoop requires OS-level user accounts on every cluster node regardless of security configuration. This post explains why, covering both secure and simple mode, and addresses whether the requirement can be removed.
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Check Entropy Levels on Linux June 27, 2017

Check Entropy Levels on Linux

Learn how to check and interpret the kernel entropy pool on Linux, why low entropy can slow down SSL handshakes and SSH sessions, and what to do when the pool runs dry.
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Check Hostname Resolution Forward and Backward Using Python or Java June 27, 2017

Check Hostname Resolution Forward and Backward Using Python or Java

Inconsistent forward and reverse DNS lookups can cause a cascade of cluster and security issues. This guide walks through quick Python and Java one-liners to verify that your hostname, IP, and reverse record all line up.
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Checking AES-NI Availability June 27, 2017

Checking AES-NI Availability

A quick reference for verifying AES-NI hardware acceleration across Java, OpenSSL, and the CPU itself. Includes benchmark commands to confirm the instruction set is actually being used.
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Checking Host Resolution Using getent June 27, 2017

Checking Host Resolution Using getent

A quick reference for using getent to verify how your Linux system resolves hostnames, short names, and IP addresses through the full NSS chain.
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