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.

MySQL Key Constraints (FK) by Database June 27, 2017

MySQL Key Constraints (FK) by Database

A quick reference for querying MySQL information_schema to list all foreign key constraints in a given database, including the referencing and referenced columns.
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Name Node Trash Check Point Interval & TGTs on Non-HA NN with KMS June 27, 2017

Name Node Trash Check Point Interval & TGTs on Non-HA NN with KMS

Adjusting the NameNode trash checkpoint interval can resolve TGT renewal issues on non-HA NameNodes using KMS. This change is safe and does not affect trash retention.
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namei: Checking Path Traversal and Permissions June 27, 2017

namei: Checking Path Traversal and Permissions

The namei command walks a full path and prints ownership, permissions, and symbolic link resolution for every component. It is a quick way to spot where a permission chain breaks or a symlink redirects unexpectedly.
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Namenode Loglevel June 27, 2017

Namenode Loglevel

How to set the HDFS Namenode StateChange log level to DEBUG via the web UI or the command line, and when that helps with troubleshooting.
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NTP Errors June 27, 2017

NTP Errors

A host health test flags NTP clock drift when the system clock falls out of sync with its NTP servers. This guide walks through diagnosing and resolving common NTP synchronization failures.
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SSL Certificate Debugging with openssl s_client June 27, 2017

SSL Certificate Debugging with openssl s_client

A practical cheat sheet of openssl s_client commands for inspecting, verifying, and troubleshooting SSL certificates in production environments.
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