SysAdmin

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.

Nginx status code 444 silently drops a connection without sending any HTTP response to the client. Learn when and how to use it for security and traffic management.

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.

A follow-up to the original MySQL NUMA swap post, explaining why the real issue is memory pressure on a single NUMA node rather than swap itself, and outlining a three-part solution for balanced allocation in production.