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NGINX sendfile, tcp_nopush, and tcp_nodelay Explained

by Danila Vershinin, January 27, 2026

Learn how NGINX sendfile, tcp_nopush, and tcp_nodelay work together to optimize static file serving and reduce network latency. This guide covers the kernel-level mechanics, when to enable each directive, and production-ready configurations.

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Linux setfacl Command: Complete Guide to ACL Permissions for Read-Only Users and Beyond

by Danila Vershinin, January 18, 2026

Learn how to use the Linux setfacl command to add read-only users to directories, configure recursive ACL permissions, and set default ACLs for new files. This comprehensive guide covers everything from basic syntax to advanced use cases for enterprise-grade access control.

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CentOS/RHEL 8: how to build the kernel RPM with native CPU optimizations

by Danila Vershinin, June 20, 2020

How to build kernel RPM packages with native CPU optimizations, for fun and profit, *and* performance

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