This article explains what virtual hosts are, how to configure them in Nginx using server blocks, the syntax for listen, server_name, location, index, and root directives, and provides practical examples with wildcard and regex hostnames, auto‑index settings, and access controls.
This article explains how Keepalived automatically monitors web servers at the IP, TCP, and application layers, removes unhealthy nodes, and reintegrates them once recovered, thereby maintaining high availability and reducing manual maintenance in complex server clusters.
Compiled from the SEI blog series, this article presents concise summaries of the six most popular DevOps topics of the past six months—including Agile integration, ChatOps communication, Vagrant environment consistency, mitigating context‑switching overhead, and a foundational overview of DevOps—offering practical insights and links to the original sources.
This guide walks you through installing Splunk on Linux or Windows, configuring automatic startup, indexing diverse log sources, and using Splunk’s powerful search, Boolean operators, and timeline features to troubleshoot and analyze system and network logs efficiently.
This article describes how Netflix’s technical operations team built an automatic anomaly‑detection system based on the DBSCAN clustering algorithm to identify subtly failing servers from time‑series error‑rate data, evaluate its effectiveness, and discuss practical deployment considerations.
This article compiles and translates a selection of the most popular DevOps blog posts from the first half of 2015, highlighting key tools such as Fabric, Ansible, Docker, and case studies from Amazon and Netflix, and provides links to the original English sources.
This article examines the problems and trade‑offs of metadata protection in cloud object storage, highlighting the importance of reliability, availability, and consistency, and comparing primary‑secondary and multi‑replica models, including the WRN algorithm and practical operational considerations.
This article shares eight practical insights on operations automation—from overall planning and standardization to continuous delivery, DevOps philosophy, leveraging testing, CMDB considerations, aiming for NoOps, and the real impact of Docker—offering a comprehensive guide for modern IT teams.
This article explains how an e‑commerce platform leverages a hybrid cloud architecture to handle massive traffic spikes from marketing events while optimizing costs, and outlines six key considerations for successful implementation.
When managing Linux servers, the du and df commands often show mismatched disk usage figures, and this article explains the three main reasons—reserved space, phantom files, and uncounted data during mount operations—and how to diagnose and resolve each discrepancy.
This guide explains step‑by‑step how to enable the Telnet service on a Huawei switch, set up a time‑range, create a basic ACL that permits a single host, and apply the ACL to the VTY lines to restrict access.
This article explains the responsibilities, requirements, and daily work of Google Site Reliability Engineers, contrasts them with Software Engineers, outlines key internal infrastructure components, and discusses the future direction of operations engineering in the cloud era.
This article chronicles the birth and evolution of China’s Project Scorpio—from its 2011 launch through Scorpio 1.0 and 2.0 specifications—highlighting its collaboration with Intel, its technical trade‑offs with Open Rack, and its impact on data‑center operations and standards.
This article explains how Docker bridges the gap between microservices and operations by standardizing packaging, simplifying multi‑language integration, enabling automated testing and continuous delivery, and reducing the complexity of system evolution and deployment.
This article presents a curated list of ten powerful server monitoring solutions, describing each tool's key features and benefits to help you ensure your web servers remain performant, reliable, and promptly alert you to any issues.
This article explains how to configure ACLs and NAT on a campus router, including static global NAT, outbound NAT with Easy‑IP, loopback interface setup, and verification steps to ensure internal users can reach the server via the public IP address.
The article outlines four key dimensions of operations value—efficiency, quality, cost, and security—explaining how each contributes to business outcomes, the challenges of implementation, and why investing in operations is essentially buying insurance against costly failures.
This article introduces Docker's container technology, explains its architecture and components, demonstrates how to prepare a Docker environment, write and build Dockerfiles, and run containers with common commands, providing practical guidance for developers and operations engineers.
The article reveals how operating‑tool systems, often underestimated, demand high technical rigor to ensure automation success rates and absolute reliability for emergency actions, requiring sophisticated failure handling, capacity awareness, and scalable design—challenges comparable to core online services.
This article chronicles the progression of image server architectures—from simple single‑machine storage to clustered, shared‑storage, and FastDFS‑based distributed systems with CDN acceleration—highlighting the challenges of capacity planning, synchronization, fault tolerance, and migration while offering practical recommendations for scalable backend design.
Load average measures the average number of processes waiting for CPU over 1, 5, and 15 minutes, differing from CPU utilization; this article explains the concepts, ideal values, illustrative analogies, and practical steps to assess and reduce server CPU load for better performance.
The article records a Q&A session from the Efficient Operations talk, where guest Peng Zhef of Mango TV discusses Docker, Redis Cluster, container resource controls, and related operational challenges, providing practical insights into Python/Flask development, pod scaling, and Linux cgroup tuning.
At QCon London, GDS architect Michael Brunton‑Spall explained how DevOps principles underpin successful microservice operations, covering service identification, initial creation, ownership, essential tooling, monitoring depth, failure handling, and practical deployment practices for scaling from a single service to a full ecosystem.
This article summarizes a guest speaker’s deep dive into Docker’s core technologies, ecosystem, emerging trends, and market impact, highlighting how container isolation reshapes traditional operations, the challenges of adoption, and practical guidance for integrating Docker into production environments.
This guide introduces essential Docker commands—from pulling images and managing containers to inspecting and removing them—providing clear examples and best practices for safely operating Docker on any system, including host file configuration, interactive sessions, background execution, and cleanup procedures.
This article explains the structure of HAProxy configuration files, detailing the five sections—global, defaults, frontend, backend, and listen—along with key directives such as daemon, maxconn, mode, timeouts, bind, and server, and shows how they work together to manage traffic and monitoring.
This article explains what Linux swap is, its drawbacks, how to tune the swappiness parameter, methods for monitoring swap usage per system and per process, and practical ways to clear swap, including useful shell scripts and commands.
The article details Weibo's evolution toward multi‑active cross‑datacenter deployment, describing initial motivations, early synchronization attempts, the eventual MCQ‑based messaging solution, operational challenges such as latency and data consistency, and best‑practice recommendations for large‑scale distributed systems.
This article examines how the rise of diverse technology stacks creates operational bottlenecks and explains why Docker’s container approach offers a flexible, distribution‑agnostic solution that lets teams adopt the right tools without sacrificing productivity, ultimately turning the “one‑hammer” dilemma into a modular, cloud‑native workflow.
The article outlines how narrowing operational permissions, automating processes, and adopting data‑center operating systems enhance security, scalability, visibility, and fault handling while reducing manual effort and enabling rapid, low‑risk changes across large infrastructures.
Meiya addresses typical startup challenges—small user base, rapid requirement changes, and an evolving team—by prioritizing development efficiency through standardized RESTful communication protocols, a four‑stage deployment pipeline, reusable frameworks, DB migrations, command‑line tools, logging with ELK, and automated server management via SaltStack.
This article provides a comprehensive overview of Google’s Borg system, detailing its purpose, user perspective, workload types, cluster and cell architecture, job and task management, scheduling algorithms, scalability techniques, and availability mechanisms for large‑scale distributed environments.
This article examines the evolution and logic of data center standardization, discussing server customization, IT and mechanical module standardization, the value of modular designs, practical examples from major tech companies, and offers guidance for both large and small users on adopting modular, standardized data center solutions.
This article presents a methodology for modular data center implementation, emphasizing the essential role of standardization—distinguishing design from prefabrication—and analyzes how leading companies like Google, Microsoft, and Facebook apply these processes, while also comparing colocation providers such as Digital Realty Trust.
This article examines the concept of modularity in data centers, explains how standardization underpins true modular design, compares industry approaches such as micro‑modules and containerized solutions, and analyzes the standardization levels of major tech companies and colocation providers to guide implementation decisions.
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.
This article examines the rapid growth of data centers, defines modular data center concepts, compares real‑world modular designs, outlines core modular attributes, and analyzes market participants and the benefits of modularization for efficiency, cost, and operational simplicity.
This article details how the high‑traffic mobile platform 糗百 migrated its massive image repository to Qiniu Cloud without service interruption, using the qrsync upload tool combined with Qiniu’s mirror storage to smoothly transfer cold data, handle hot data, and alleviate I/O bottlenecks.
Dropbox operations engineer Rajiv shares practical scalability design techniques, including load‑testing, app‑specific metrics, Bash analytics, log management, UTC usage, and the reliable technology stack that enables a service with 40 million users to run with a very small operations team.
This guide shows how to configure traffic statistics on two switches by creating ACLs, traffic classifiers, behaviors, and policies, applying them to specific GigabitEthernet interfaces, and finally displaying the traffic policy statistics from the command line.
This guide shares ten practical fault‑management techniques—ranging from proactive attitude and prioritizing incidents to continuous follow‑up and team collaboration—to help operations teams reduce damage, maintain service reliability, and keep users engaged during outages.
This article outlines the concept of efficient operations, analyzes why it is difficult to achieve, and presents practical strategies—including clear responsibilities, technical specialization, management professionalism, and good customer interaction—to improve operational efficiency in technology teams.
This article explains why many IT teams struggle with code that works in development but fails in production, introduces Puppet as a configuration‑management platform, describes its declarative language, resources, types, providers, classes, manifests and modules, and shows how it enables reliable, collaborative DevOps workflows.
This article outlines four key practices—comprehensive engineering documentation, robust business backup, continuous online monitoring, and regular periodic inspections—that together ensure optimal performance, reliability, and long‑term benefits for data center operations.
This article compiles a comprehensive list of open‑source tools covering backup, cloning, cloud platforms, cloud workflows, distributed file systems, cloud storage, code review, collaboration suites, CMDB, configuration management, continuous integration/deployment, DNS, hosting control panels, IT asset management, and LDAP, providing a valuable resource for IT professionals.
This article examines how load‑balancing technologies such as Nginx, LVS, and HAProxy are chosen according to website scale, outlines their respective strengths and weaknesses, and describes typical deployment stages from simple single‑point setups to complex multi‑layer architectures.
This article examines how WhatsApp grew its user base, message volume, and infrastructure dramatically over two years while keeping the engineering team at ten, detailing the architectural choices, Erlang‑based stack, hardware scaling, decoupling strategies, and the operational challenges that led to both performance gains and a major outage.
This article explains various load‑balancing scheduling algorithms—including Round Robin, Weighted Round Robin, Least Connection, Weighted Least Connection, Adaptive Agent‑Based balancing, Fixed Weighted, Weighted Response, and Source IP Hash—detailing how each distributes traffic and handles server capacity differences.
This article explains the definitions of concurrent users (Vu) and transactions per second (TPS), provides practical methods for estimating these metrics in new and existing systems, and outlines how to calculate resource usage such as connection counts, memory, and file descriptors.
This article outlines eBay's practical scalability best practices—including functional partitioning, horizontal sharding, avoiding distributed transactions, asynchronous design, virtualization, and judicious caching—to help large‑scale web systems achieve reliable, cost‑effective growth.
This article describes how a Linux operations team streamlined frequent web code releases by building a web‑based deployment system that combines Git for version control, Rsync for synchronization, and Python/Tornado for backend services, eliminating manual intervention and improving efficiency.
This guide explains how to identify high‑frequency visitor IPs from Nginx logs and configure Nginx to deny those IPs—or entire ranges—using block files, includes, and reload commands, providing both basic and advanced blocking techniques.
This article introduces a ten‑year journey of a sysadmin turned operations director, outlining why efficient operations are hard, what efficient ops mean, and seven practical strategies—including clear responsibilities, professional processes, and a good service interface—to boost productivity and satisfaction across IT teams.
This guide explains why log analysis is critical, outlines common challenges, compares heavyweight trace systems with the lightweight LEK stack, and provides step‑by‑step installation, configuration, and best‑practice tips for Logstash, Elasticsearch, and Kibana.
This guide explains why Linux systems report "no space left on device" or read‑only file systems, shows how to inspect disk usage, inodes, and hardware health with commands like df, du, mount, smartctl, hddtemp, and provides step‑by‑step remediation techniques such as cleaning files, compressing logs, remounting, and repairing filesystems.
This guide shares practical, experience‑backed techniques for optimizing Nginx and PHP‑FPM on high‑traffic Linux servers, covering UNIX sockets, worker processes, upstream load balancing, logging, compression, caching, timeouts, buffer sizes, kernel tweaks, and monitoring.
This guide shows how to use vmstat to pinpoint whether high load averages on a Linux system are caused by CPU saturation, insufficient memory, or slow I/O, by interpreting each column of the vmstat output.
This guide explains how to conduct comprehensive product data analysis for games, covering methods like 5W2H, multi‑dimensional analysis, user modeling, and the AARRR framework, while detailing key metrics such as DAU, ARPU, LTV, CAC and ROI to drive informed decisions.
A severe Bash vulnerability has been disclosed, and this guide shows how to quickly test your Linux system for exposure, apply an urgent update, and verify the fix, ensuring your SSH environment remains secure.
This article systematically outlines the essential steps and considerations—ranging from language choice, version control, hardware and data center selection, to architecture, software, database, storage, and code optimization—to help a small website scale from a few thousand daily visits to millions while avoiding costly pitfalls.
This article explains how applying the NGOSS methodology to CMDB construction can clarify management scope, define granularity, automate discovery, and handle lifecycle changes, ultimately reducing operational costs and improving accuracy in IT infrastructure management.
This guide shows how to turn a cloud‑drive folder into a pseudo‑remote Git repository, enabling seamless code synchronization between office and home without relying on services like GitHub.
This guide explains how to set up a Linux server with two network cards so that internal traffic uses its own NIC while external traffic uses the other, including default gateway configuration and persistent route commands.
This guide provides a comprehensive 11‑step Linux security inspection checklist, covering account verification, log analysis, process and file checks, package integrity, network monitoring, scheduled tasks, backdoor detection, kernel modules, services, and rootkit scanning to help identify system compromises.
This article presents a comprehensive, production‑ready server naming convention that combines memorable word lists, geographic and environment tags, purpose codes, and serial numbers, offering clear DNS A and CNAME records to simplify management, automation, and scalability across large data centers.
This article examines Stack Overflow’s highly efficient architecture—using a mix of Linux and Windows, vertical scaling, extensive caching, SSD storage, and minimal hardware—to deliver billions of page views while keeping server utilization remarkably low.
This article explains why RabbitMQ clusters struggle with network partitions, how to detect partition events via logs and rabbitmqctl, the impact on queues and bindings, and step‑by‑step methods—including manual recovery commands and automatic handling modes—to restore a healthy cluster.
This article compares the three most widely used load‑balancing solutions—Nginx, LVS, and HAProxy—detailing their advantages, disadvantages, typical use‑cases, and how to select the appropriate technology as web traffic scales from small sites to large‑scale services.
This article explores the definition, workflow, essential skills, responsibilities, current challenges, and future prospects of large‑scale website operations, offering practical guidance for engineers who aim to ensure stability, scalability, and automation in high‑traffic online services.
This guide explains what sosreport does on RHEL/CentOS, how to install the sos package, generate a system diagnostic report, locate the compressed output, and use various command‑line options to include or exclude specific modules.
The first launch of Taijie Mall’s flash‑sale site crashed due to uncompressed images, a missing purchase button, and a refresh avalanche, but by isolating services and applying capacity‑planning formulas we identified key bottlenecks, implemented CDN and simplifications, and achieved a much smoother second launch.
This guide explains how rsync synchronizes files and directories on Linux, details its most useful options, shows how to configure an rsync daemon with the required configuration files, and outlines the various command syntaxes for local and remote operations.
This hands‑on diary chronicles the author’s experience installing CentOS 7, highlighting differences from earlier RHEL‑based releases such as single‑package selection, XFS default partitions, systemd‑based service management, network interface renaming, and challenges with LVM resizing and DHCP configuration.
Learn how to install, configure, and use dstat—a versatile, Python‑based Linux monitoring tool that replaces vmstat, iostat, netstat, and more—covering its features, command‑line options, plugins, CSV export, and real‑time performance insights for effective system administration.
Learn about ten free, open‑source tools—including Grinder, JMeter, and Siege—that let you simulate concurrent users, measure performance, and identify bottlenecks in web applications, helping you assess server capacity and optimize site responsiveness under load.
This guide presents practical Linux system tweaks and PHP configuration adjustments—including file descriptor limits, disabling atime, using tmpfs, and optimizing php.ini and PHP‑FPM settings—to dramatically improve high‑load PHP application responsiveness and stability.
This article examines common website architecture layers, compares hardware (F5) and software (LVS, Nginx) load‑balancing solutions, discusses high‑availability setups with Keepalived/Heartbeat, evaluates their network dependencies, and offers practical recommendations for choosing and monitoring load‑balancers, file servers, and databases in high‑traffic environments.
This guide lists the key performance monitoring metrics for popular web servers, application servers, databases, and caching systems, detailing throughput, connection counts, cache hit rates, memory usage, and other vital statistics needed to keep services running efficiently.
The article examines the inevitability of service coupling in large‑scale web applications and proposes a two‑dimensional architecture that separates business and logic layers, uses internal data stores, introduces a naming‑and‑location service, selects appropriate transport and RPC protocols, and automates operations with health checks, load balancing, and failover to achieve continuous reliability.
This article outlines the product manager’s role as a communication hub across leaders, design, engineering, and operations, detailing each project phase, common challenges, and practical techniques—such as focusing on product goals and respecting professional expertise—to enhance collaboration and reduce rework.
The article outlines the progressive skill set for operations engineers—T4 must master core operations, service metrics, and environment administration; T5 adds independent problem analysis, trade‑off judgment, and solution selection; T6 demands deep cross‑disciplinary knowledge, design elegance, data‑driven reasoning, and the ability to influence others, while also debunking common misconceptions about products, scripts, and platforms.
