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.

AWS Volume Juggling for Impaired Nodes and Node Health Check July 28, 2021

AWS Volume Juggling for Impaired Nodes and Node Health Check

A practical guide to diagnosing impaired EC2 instances by detaching and reattaching EBS root volumes to a rescue instance. Covers the full workflow from stopping the impaired node to restoring it to normal service.
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Delete Existing Users From Ranger July 6, 2021

Delete Existing Users From Ranger

A quick walkthrough of using the Ranger REST API to bulk-delete existing users, including how to capture an auth cookie and loop through a user list with curl.
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Debug Kerberos Gen Credentials in CM February 10, 2021

Debug Kerberos Gen Credentials in CM

Learn how to enable Kerberos trace logging in Cloudera Manager’s credential generation scripts to diagnose authentication failures quickly.
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Spark Token Debug February 4, 2021

Spark Token Debug

Enable verbose Kerberos and token logging on Spark driver and executor nodes to capture the diagnostic data you need when authentication is failing. Covers log4j configuration files and the exact spark-submit flags to wire them in.
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Explain Kerberos Like I'm 5 December 10, 2020

Explain Kerberos Like I'm 5

A plain-English walkthrough of how Kerberos authentication works, using a simple analogy to make the ticket-granting process click. Perfect for anyone who has stared at a KDC diagram and felt lost.
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LDAPS and UnicodePWD December 1, 2020

LDAPS and UnicodePWD

LDAPS is a hard requirement when setting passwords via unicodePwd on Active Directory. Non-TLS connections are rejected by AD itself, and SASL is not a supported alternative.
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