This article explains how to use the Linux tail command to monitor log files in real time, filter errors, and reliably continue following logs after rotation by using the -F option, providing practical guidance for system administrators and developers.
This article examines key 2015 mobile strategy considerations—including the rise of low‑code visual development, the adoption of bimodal IT, cloud‑based development, and the HTML5 versus native debate—to help enterprises boost productivity, reduce backlog, and make informed technology choices.
The article presents a comprehensive overview of algorithms for analyzing Weibo’s social network, covering label propagation, user similarity via LDA, temporal and interaction factors, community detection, influence ranking using PageRank variants, and methods for identifying spam accounts.
This article summarizes a comprehensive talk on Puppet covering its evolution, core concepts, architecture, ecosystem, practical use cases such as building a CMDB, automated deployment pipelines, OpenStack deployment, and the interplay with Docker, highlighting how Puppet drives modern operations automation.
The article explains how to safely edit a particular line range in a large file using the Unix sed command, guiding readers through consulting the manual, understanding address syntax, and providing a concrete example command to replace text within the specified lines.
The article explores the evolution from single‑core processors to multi‑core systems, explains threading, blocking, and synchronization concepts, and compares high‑performance communication models such as asynchronous I/O, IOCP on Windows and epoll on Linux, highlighting their trade‑offs for backend server scalability.
This article chronicles Suning’s journey from early SAP‑based data warehouses to a modern, open‑source big data platform featuring real‑time collection, Hadoop‑Hive offline processing, Storm‑based streaming, and a visual development environment, highlighting how each layer addresses growing data volume, variety, and business demands.
The article examines how travel companies in China and India are rapidly developing Apple Watch applications to deliver bite‑sized flight information, notifications, and social features, highlighting design simplicity, hardware constraints, user adoption, and future possibilities such as payments and hotel key integration.
The presentation reviews Alibaba's ongoing transition to a large‑scale, SDN‑driven data‑center network using OpenFlow hybrid switches, VXLAN overlay, automated deployment, and discusses the challenges, solutions, and future directions for network elasticity, hybrid cloud integration, and standardization.
This article examines Facebook's cold storage system, detailing how the company redesigned hardware and software to slash power consumption, improve reliability with Reed‑Solomon coding, mitigate bit‑rot, and balance loads while supporting massive photo archives in energy‑constrained data centers.
The article explains the origins, core features such as scalability, cost‑effectiveness, fault tolerance, and elastic expansion of distributed systems, and outlines design philosophies like low hardware requirements, horizontal scaling, avoidance of single points of failure, minimized inter‑node communication, and stateless service architecture.
Open‑Falcon, an open‑source, enterprise‑grade monitoring solution from Xiaomi’s operations team, offers zero‑configuration data collection, high‑throughput horizontal scaling, flexible alerting, efficient historical queries, and a user‑friendly dashboard, with detailed documentation, quick installation steps, and a highly available architecture.
This guide walks you through Linux's task‑scheduling tools—at, batch, crontab, and anacron—covering one‑time and periodic job setup, command syntax, permission files, and practical examples to automate system administration tasks.
This guide explains how to install htop on CentOS, describes its interface layout, details the functionality of each F‑key shortcut, and covers useful command‑line options for customizing the real‑time process monitoring experience.
This article examines the concept of modular data centers, defines modularity, identifies industry drivers, evaluates claimed benefits such as rapid deployment and reduced PUE, and explores various micro‑module solutions through detailed design examples and logical derivations.
This article explains the fundamentals of instant messaging, its system characteristics, protocol layers (application, security, transport), practical protocol examples, and a detailed real‑time web chatroom design using HTTP long‑polling and backend architecture considerations.
The article explains how malicious JavaScript can turn browsers into participants of DDoS attacks through techniques like server hijacking and man‑in‑the‑middle injection, and describes how HTTPS and the emerging Subresource Integrity feature can help protect websites from such threats.
This article provides a comprehensive overview of Google Spanner, a globally distributed, multi‑version database, covering its background, core components, TrueTime‑based global synchronization, Paxos replication, data model, and the various transaction and concurrency mechanisms it employs.
The interview with Douban's chief architect Hong QN details the platform's online and offline architecture, including load balancing, the DAE PaaS, the BeansDB key‑value store, the DPark big‑data processing engine, and the team organization and operational practices that support these systems.
This article walks Linux beginners through the complete boot sequence—from POST and BIOS loading, through MBR and GRUB stages, kernel and initrd initialization, to the init process and final login prompt—explaining each component’s role and how the system transitions from power‑on to a usable environment.
