This guide walks through setting up a highly available two‑node Nginx service on CentOS 7 using Corosync and Pacemaker, covering topology, environment preparation, host synchronization, HA component installation, NFS sharing, resource configuration with crmsh, and testing the failover behavior.
This article distills a 2016 Global Operations Conference talk that introduces the Application Running Environment (ARE) concept, outlines IaaS's fundamental and immutable characteristics, examines multi‑team challenges, and proposes a stack‑based, democratic, aspect‑oriented management approach with concrete schemas, patterns, and operational models.
This article explains how focusing on non‑functional quality during external acceptance testing can drive DevOps teams to improve system monitorability, reduce technical debt, and establish concrete change‑control, acceptance, and performance verification processes for both operational and business‑level observability.
This step‑by‑step tutorial shows how to install Samba on a Linux server, configure a shared home directory, create a Samba user, adjust firewall and SELinux settings, and finally access the share from a Windows client.
This article introduces the key OpenStack services—Nova, Neutron, Keystone, Glance, Horizon, Cinder, Swift, Heat, and Ceilometer—explaining each component’s role, functionality, and how they collectively enable scalable compute, networking, identity, image, dashboard, block storage, object storage, orchestration, and telemetry in cloud environments.
A MySQL replica was consuming an entire CPU core due to single‑process replication, and analysis of binlog and InnoDB status revealed heavy row locks on a table without a primary key, which was resolved by adding an auto‑increment ID, dropping CPU usage to 3% and eliminating replication lag.
This article examines how detailed user demand differences shape personalized design, functional, content, and service elements in mobile apps, illustrating why catering to specific scenarios and user states is crucial for standing out in a competitive market.
This article explains the fundamentals of microservices architecture, contrasting it with monolithic and SOA approaches, and details design principles, messaging patterns, integration styles, data decentralization, governance, service discovery, deployment with Docker and Kubernetes, security, transaction handling, and fault‑tolerance techniques.
This article explains practical methods for importing various external data formats—such as CSV, plain text, XML, and JSON—into MySQL, covering command-line utilities, LOAD DATA statements, stored procedures, third‑party tools like mysqljsonimport, and using MySQL Workbench, while addressing configuration and security considerations.
This article chronicles JD.com's transition from commercial to open‑source databases, detailing MySQL's rapid growth, the development of the JMySQL automation platform, and future directions for database design, security, monitoring, and performance optimization in large‑scale e‑commerce environments.
This step‑by‑step guide shows how to configure a three‑node MariaDB HA cluster on CentOS using NFS shared storage, corosync multicast heartbeat, pacemaker resource management, and a virtual IP, including installation, configuration files, and failover testing.
This article reviews the evolution of Configuration Management Databases (CMDB) in traditional enterprises, identifies common implementation challenges, and proposes a cloud‑native CMDB architecture that combines flexible models, automated data collection, API exposure, and scenario‑driven services to meet modern IT operations needs.
Docker, built on Linux container technologies, offers a portable, cross‑platform runtime environment and a rich ecosystem—including image registries, orchestration tools, and cloud integrations—that simplifies development, deployment, and management of distributed applications, while providing resource isolation, high utilization, and DevOps automation.
This article provides a comprehensive overview of Flume NG, covering its architecture, core components (source, channel, sink), reliability mechanisms, common deployment scenarios, installation steps, configuration examples, compilation instructions, and practical best‑practice recommendations for building robust log‑collection pipelines.
This guide introduces Python’s socket module, explains socket families and types, details essential server and client functions, walks through step‑by‑step TCP connection creation, and provides complete server and client code examples for practical network programming.
In this interview, Meituan’s technology committee chair Xia Huaxia explains how the company’s architecture evolved from a simple LAMP stack to a multi‑layer, cloud‑native system, detailing the separation of infrastructure, business, and front‑end components, the use of open‑source tools, and the systematic simplification, standardization, automation, and quantification of business processes to support rapid O2O growth.
This article provides a comprehensive overview of HTTPS, explaining its purpose, advantages, and drawbacks, and delves into the underlying cryptographic concepts such as symmetric and asymmetric encryption, hash algorithms, digital signatures, digital certificates, and the detailed SSL/TLS handshake process.
This article outlines the mindset, problem‑solving approach, core PHP knowledge, and project‑management expertise required to transition from a junior or mid‑level developer to a competent PHP senior engineer.
This article details how 58.com’s 58‑BangBang service evolved through four architectural stages—from a traditional instant‑messaging system to a mobile‑push enabled platform—addressing massive traffic, scalability, and integration challenges across IM, merchant management, and mobile marketing.
The article explains how a seemingly harmless SQL statement, when executed millions of times on an IBM Power780 system with a 1 TB configuration, can overload the library cache mutex, causing the database to stall, and provides the original script, reproduction steps, and practical advice to avoid such catastrophic contention.
