Technology

A practical guide to using SQLline to replicate SQL client behavior when testing JDBC connectors. Covers downloading the tool, setting up the classpath, and connecting to an Azure MySQL instance.

JDK 1.8.0u242 and later introduced Kerberos referral handling per RFC 6806, which can break Active Directory name canonicalization and produce a KRB_AP_ERR_MODIFIED error. This post walks through the two configuration fixes that resolve the issue.

A practical guide to tuning Linux TCP/IP kernel parameters for high-speed, high-latency broadband connections, covering buffer sizing, timeout adjustments, SYN flood protection, and congestion control selection.

Apache Tuner is a Perl script that analyzes your Apache configuration and system resources to surface quick performance wins. Run it, read the suggestions, and tune your MPM, KeepAlive, and worker settings with confidence.

A lightweight bash script that automatically allocates and assigns an Elastic IP to an EC2 instance at launch using User Data, eliminating the need for manual IP management.

A quick bash logging setup that uses a named pipe and tee to capture stdout and stderr to a file while keeping the terminal interactive. Five lines of shell code, zero external dependencies.