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.

Check Hue Credentials and Flags (Kerberos) August 4, 2017

Check Hue Credentials and Flags (Kerberos)

Walk through inspecting a Hue keytab file, verifying its principals with klist, and confirming that the resulting ticket carries the Renewable flag Hue requires for long-running service operations.
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SAML Custom Attributes in Hue July 21, 2017

SAML Custom Attributes in Hue

Hue returns a Permission Denied error when the IDP sends custom SAML attributes that pysaml2 cannot map. This guide walks through creating an attribute mapping file and configuring Hue to resolve the issue.
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400 Cannot Find Key of Appropriate Type to Decrypt AP REP July 18, 2017

400 Cannot Find Key of Appropriate Type to Decrypt AP REP

A practical troubleshooting guide for the Kerberos AP REP decryption error, covering the most common causes from keytab mismatches to encryption type misconfigurations.
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Trace Kerberos in the CLI June 29, 2017

Trace Kerberos in the CLI

Kerberos authentication failures can be frustrating to debug. Setting the KRB5_TRACE environment variable gives you detailed library-level logging that pinpoints exactly where the exchange breaks down.
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Active Directory Error Types: Kerberos Client Credentials Revoked June 27, 2017

Active Directory Error Types: Kerberos Client Credentials Revoked

A quick reference for diagnosing Kerberos authentication failures in Active Directory, covering the lockout state machine and the specific error codes (5be, 775, 18) that indicate revoked credentials or a locked account.
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AES-NI Encryption in Flight for HDFS June 27, 2017

AES-NI Encryption in Flight for HDFS

Configure AES-NI accelerated encryption in transit for HDFS by setting the cipher suite and key length in hdfs-site.xml on both the NameNode/DataNode and client sides.
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