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.

Kerberos Cross-Realm Trust June 27, 2017

Kerberos Cross-Realm Trust

Kerberos cross-realm authentication relies entirely on TGS exchanges between KDCs. Understanding the three-step ticket flow makes it easier to troubleshoot trust relationships between domains.
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Kerberos Debug Mode for the JVM, Spark, and SPNEGO June 27, 2017

Kerberos Debug Mode for the JVM, Spark, and SPNEGO

Enable Kerberos debug logging in a JVM, Spark driver, and Spark executors to troubleshoot SPNEGO and authentication issues. Covers the exact Java system properties, Spark configuration keys, and how to redirect Spark logs to stdout so Kerberos output interleaves with application logs.
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Kerberos Shortname Mapping (Auth_to_Local) June 27, 2017

Kerberos Shortname Mapping (Auth_to_Local)

A practical walkthrough of how Hadoop maps Kerberos principals to short names via the auth_to_local property, including rule syntax, acceptance filters, and common troubleshooting patterns.
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keyctl: Key Has Been Revoked June 27, 2017

keyctl: Key Has Been Revoked

A quick guide to diagnosing and resolving the ‘Key has been revoked’ error in the Linux kernel keyring using keyctl commands.
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Mount Output in Columns: Formatted Output for Mount List June 27, 2017

Mount Output in Columns: Formatted Output for Mount List

Pipe the mount command through column -t to get a clean, aligned table of all mounted filesystems. A quick sysadmin trick for scanning devices, mount points, and options at a glance.
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Multiple HTTP Service Principal Names June 27, 2017

Multiple HTTP Service Principal Names

How to verify and manage HTTP service principal names in Active Directory using ldapsearch and setspn, including a note about Centrify’s uppercase requirement.
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