How-To

A practical walkthrough of Nginx’s limit_req module, showing how to cap request rates and protect PHP endpoints from HTTP-based denial-of-service attacks.

Learn how to chain multiple if conditions in Nginx to build a composite variable and route traffic based on the combined result.

A practical reference for Nginx’s ngx_http_rewrite_module, covering the break, if, return, rewrite, set, and related directives with working examples and processing-order details.

The noapic kernel parameter disables the Advanced Programmable Interrupt Controller, a useful workaround for interrupt routing issues on older or misconfigured systems.

A deep dive into why MySQL on NUMA systems suffers from unpredictable swapping, and how a single numactl interleave fix eliminates the problem entirely.

Percona XtraDB Cluster can recover a crashed node and rejoin it to the cluster using an incremental state transfer. This post walks through how GTID-based position recovery works under the hood and what you will see in the error log during the process.