This guide walks you through firewalld on CentOS 7, covering how to check status, start, restart, enable at boot, manage zones, configure ports, sources, and rich rules, and explains the impact of each command with practical examples for secure network administration.
The article explains how Ant Group’s Logic Data Center (LDC) architecture evolved from monolithic to unit‑based distributed design, using zones, sharding, and read‑write separation to sustain a record 583,000 transactions per second during the Double‑11 shopping festival.
This article provides a comprehensive overview of Fibre Channel switches, covering NPIV virtualization, zone concepts and types, various port modes for long‑distance links, fiber cable and optical module choices, credit buffer considerations, ISL trunking, and special port configurations such as Brocade AG mode.
This guide explains DNS fundamentals, resolution and query types, zone and resource record structures, master‑slave architecture, and provides step‑by‑step instructions for installing, configuring, and testing BIND on CentOS systems.
