When a VMware VM with a 200 GB system disk runs an 11 GB Docker service, it may report ‘no space left on device’ because the LVM logical volume for /var is only 1 GB, and the guide shows how to extend the relevant LVM volumes and resize the filesystems to resolve the issue.
This guide outlines the purpose, scope, principles, and detailed specifications for log management—including file naming, retention periods, content rules, security handling, and monitoring—to ensure reliable issue tracing, data safety, and regulatory compliance across all system development projects.
This article walks through a real‑world incident where a data‑platform server showed near‑100% CPU usage, explains step‑by‑step investigation using top, pwdx, and jstack, identifies a time‑conversion utility as the root cause, and presents a streamlined script‑based solution that reduced CPU load by thirtyfold.
Suzhou Bank’s Mobile Banking 5.0 platform, showcased at the 23rd GOPS Global Operations Conference, demonstrates how a unified micro‑service architecture, advanced security technologies, and a comprehensive DevOps platform can elevate development efficiency, meet international standards, and drive innovative financial services.
The article explains the complete shutdown of CentOS, outlines viable alternative Linux distributions, and provides detailed guidance on planning and executing database migrations to ensure security, performance, and compatibility during the transition.
This article presents ten useful Python automation scripts covering file renaming, web page downloading, data cleaning, scheduled tasks, email sending, testing, database backup, log analysis, file compression, and document generation, each with clear explanations and ready‑to‑run code examples.
This guide compiles essential Bash one‑liners for Apache and Nginx log files, showing how to list top IPs, count unique visitors, tally page hits, filter bots, and generate time‑based request statistics for effective web‑service monitoring.
This article provides a comprehensive guide to designing and deploying an enterprise‑grade monitoring system, covering requirement analysis, tool selection such as Prometheus and Zabbix, system architecture, step‑by‑step implementation, alerting, visualization, and ongoing maintenance to ensure reliable IT operations.
This guide explains Linux syslog fundamentals, common log file locations, their purposes, the roles of syslogd and klogd, how to configure rsyslog, set up log rotation with logrotate, and deploy a centralized log server for multiple hosts.
The article details China's 2024‑2027 Information Standard Construction Action Plan, the launch of synchronized ITU DevOps international and domestic assessments, and how Shanghai Stock Exchange's website and app platform successfully passed both standards, highlighting the significance for national standardization and operational excellence.
From manual server management to automated scripts, AIOps, and ChatOps, this article traces the evolution of IT operations and demonstrates how large language models boost efficiency, enable intelligent assistants, automated diagnostics, and smart log analysis, aiming for rapid fault detection, localization, and resolution.
The article outlines SRE‑based incident mitigation and recovery practices, covering urgent mitigations, impact reduction, key metrics such as TTD, TTR, TBF, and detailed strategies for shortening detection and repair times, preventing fatigue, improving observability, and designing resilient systems.
The Agricultural Bank of China’s Digital Twin Platform passed both the ITU DevOps international standard and the domestic DevOps Level‑3 Continuous Delivery assessment, highlighting China’s push for internationalized information standards and showcasing the broader rollout of synchronized DevOps evaluations across the nation.
The article details China’s 2024‑2027 Information Standard Construction Action Plan, the launch of synchronized ITU DevOps international and domestic assessments, and a case study of Shandong City Commercial Bank Alliance’s successful dual‑certification, highlighting interview insights, performance metrics, and the broader push for standards internationalization.
This article outlines practical principles and communication techniques for assigning responsibility during system failures, emphasizing strategic questioning, ally‑building, moral positioning, and nuanced response methods to protect oneself while ensuring effective incident resolution.
This case study details how the AiFenxi business intelligence platform integrated Apache APISIX as a high‑performance API gateway within Tencent Cloud TKE, addressing latency, scalability, and security challenges, and outlines the architectural changes, deployment steps, and resulting performance improvements.
This article explains why regular disaster role‑playing, systematic testing, and focused responder preparation are essential for building robust incident response capabilities and reducing operational risk in production environments.
This guide outlines essential steps for creating a robust, high‑availability website architecture, covering domain acquisition, DNS management, CDN deployment, image caching, data center selection, monitoring, DDoS mitigation, redundancy, server configuration, database replication, testing environments, security practices, and operational tooling.
This article explains a new visualized full‑chain log tracing solution that organizes business logs by logical flow, dynamically links them during execution, and provides a visual, searchable view of the entire business process, dramatically improving issue localization in large‑scale distributed systems.
This comprehensive guide lists 150 indispensable Linux commands covering file management, system monitoring, networking, user administration, process control, and more, providing clear explanations to help both beginners and experienced administrators efficiently manage Linux environments.
This article outlines a comprehensive approach to improve test environment stability by introducing a trunk‑based environment as the default, detailing solution architecture, various testing scenarios, implementation steps, and monitoring practices to transition from unstable daily environments to a more reliable testing ecosystem.
This article provides a comprehensive guide on building a unified log collection system using Filebeat and Graylog, covering the tools' concepts, configuration files, component functions, Docker deployment, and practical code examples for efficient log monitoring across multiple environments.
This article details how Alipay’s Mantiantianxing platform was designed and built to unify page construction, fine‑grained operation, and data feedback, thereby solving low R&D and operation efficiency, reducing duplication, and enabling rapid, scalable innovation across multiple product front‑ends and back‑ends.
This guide outlines comprehensive principles for generating, using, and cleaning test data across development, performance, and production environments, emphasizing independence, realism, security, proper permission controls, and systematic synchronization to ensure reliable and safe testing processes.
This article examines how cloud computing has become central to enterprise IT architecture, explores its cost governance challenges, outlines industry trends, standards like ITIL and COBIT, and presents practical strategies—including FinOps, multi‑cloud platforms, and sustainable practices—to effectively manage and reduce IT costs.
This article details the evolution of Vivo's CICD artifact management across four stages, explains its core functions such as multi‑type support, unified storage, promotion, security scanning, aging, and permission control, and outlines future directions toward smarter, more integrated, and secure DevOps operations.
This article explains how to resolve Docker image pull failures in China by editing the daemon.json file to add accessible domestic registry mirrors, providing step‑by‑step instructions and a ready‑to‑use mirror list for developers and operators.
This article explores how service availability is quantified, explains the impact of MTBF and MTTR on reliability, and presents concrete operational practices—including redundancy, traffic control, and change‑management techniques—to move systems from basic uptime to true high‑availability levels.
This extensive training program covers everything a data center operations engineer needs—from foundational infrastructure management and server hardware maintenance to advanced network configuration, security hardening, monitoring, fault handling, and practical hands‑on skills for real‑world challenges.
This article presents a comprehensive analysis and engineering of Qunar's flight‑ticket intelligent pre‑warning (Radar) system, covering the business need, value analysis, architectural redesign, feature extraction, indicator classification, accuracy quantification, multi‑algorithm anomaly detection, automatic parameter tuning, observed effects, and future plans to incorporate large‑model techniques.
This guide explains why Dockerhub mirrors stopped working, lists the unavailable and usable registry URLs, and shows step‑by‑step how to configure Docker with multiple mirror sources to ensure reliable image pulls.
With IPv4 address space exhausted and providers beginning to charge for public IPv4 usage, organizations face rising costs and complex migration challenges, prompting a strategic shift toward IPv6 adoption, alternative solutions, or passing expenses to customers, while grappling with ISP support gaps and tooling limitations.
The Shanghai Jiao Tong University mirror announced the shutdown of its Docker Hub accelerator on June 6, prompting users to replace the unavailable address with other domestic mirrors such as NetEase, Alibaba Cloud, Baidu, and Nanjing University to maintain fast container image downloads.
This guide shows how to use df, du, find, and lsof commands to locate large directories, files, and deleted-but-open files that consume disk space, and explains how to adjust reserved filesystem space on Linux.
This article demonstrates how Python can automate common operations tasks such as remote command execution, log file parsing, system monitoring with alerts, batch software deployment, and file backup and recovery, providing code examples using libraries like paramiko, regex, psutil, fabric, and shutil.
This article explains how a simple single‑Tomcat deployment evolves into a multi‑layered load‑balancing architecture using Nginx, gateway authentication, static‑dynamic separation, and finally a combination of LVS and Nginx with DNS and CDN to handle massive traffic efficiently.
This guide explains how to use the journalctl command to view, filter, and manage systemd-journald logs on Linux, covering help options, match expressions, persistent storage, disk usage, vacuuming, time ranges, unit filtering, priority levels, real‑time streaming, output formatting, and kernel log access.
This article compiles several Zhihu answers that trace the historical shift from Windows/IIS to Linux-based servers, highlighting ecosystem dynamics, cost advantages, performance differences, container support, and open‑source adoption that together explain why Linux dominates modern server environments.
The article provides a comprehensive overview of the Python Software Foundation's infrastructure, detailing its team, cloud providers, data centers, and the hosting arrangements for numerous services such as PyPI, docs, bug trackers, and the main Python website.
This article outlines nine crucial microservice monitoring indicators—including request tracing, health checks, throughput, response time, success and error rates, concurrent connections, CPU/memory usage, and resource utilization—to help engineers assess performance and reliability in distributed systems.
This guide details how to configure Linux services for automatic boot startup using systemd (systemctl), the legacy chkconfig method, generic script approaches, and crontab @reboot syntax, plus best‑practice recommendations for production environments.
The author recounts five years of building TinyPilot, detailing revenue growth, product launches, team expansion, operational challenges, cost management, and personal reflections on entrepreneurship, while sharing lessons learned and goals for the coming year.
This article presents ten ready‑to‑use Python scripts that automate common operational tasks such as file backup, scheduled email reminders, web scraping, bulk image renaming, log analysis, folder synchronization, database backup, API monitoring, performance testing, and CI/CD deployment.
This article explains the concept of graceful shutdown, outlines essential steps, examines Kubernetes pod termination and Spring Boot integration with Nacos, and provides practical optimizations—including PreStop hooks, terminationGracePeriod settings, and actuator shutdown—to ensure reliable service termination without data loss.
This article explains the concept of gray (canary) release, why it’s essential for large‑scale architectures, outlines the step‑by‑step workflow, describes common traffic‑splitting strategies, and offers practical tips for monitoring and gradually scaling deployments to ensure system stability.
This guide presents comprehensive principles, best practices, and techniques for designing, deploying, and maintaining stable distributed systems, covering fault tolerance, monitoring, capacity planning, incident response, and operational reliability to help engineers achieve high availability.
These core principles—minimal dependency, weak dependency, distribution, rate limiting, degradable design, balanced risk, fault prevention and isolation, no single point of failure, self‑protection, automatic failover, and retry/idempotency/compensation—guide the design of highly available systems by reducing risk, ensuring redundancy, and protecting services at all layers.
This article demonstrates several efficient Linux command‑line methods—including tail, head, grep, sed, and pagination tools—to quickly pinpoint error entries, view surrounding context, filter by time range, and count occurrences within massive log files.
This article documents how a team reduced the average deployment time of the omega application from 229 seconds to 69.71 seconds—a 69% speed‑up—by analyzing startup logs, removing unused middleware, upgrading libraries, fixing logging configurations, and applying async bean creation and script optimizations.
China’s banks are rapidly adopting DevOps, with CAICT’s maturity model showing China Merchants Bank topping assessments across multiple years, highlighting how standardized DevOps practices boost IT efficiency, product delivery speed, and business satisfaction in the era of digital transformation.
This guide explains how to configure host, network, and default routes on Linux using the route command, covering syntax, option meanings, example commands, and how to view or delete routes for communication across multiple subnets.
This article describes Zhihu's hybrid cloud architecture—including offline, online, and GPU data centers—its self‑built UnionStore cache, the performance and latency challenges faced during large‑scale AI model training, and the subsequent evaluation and migration to Alluxio community and enterprise editions to achieve higher throughput, stability, and lower operational overhead.
This article explains the concept, challenges, step‑by‑step process, organizational and tool requirements, capacity governance, planning, and AI‑driven prediction for full‑link load testing, illustrating how enterprises can ensure system capacity and stability during large‑scale online events.
This article compiles diverse Zhihu answers discussing whether Kubernetes is necessary, weighing its automation benefits and scaling power against configuration complexity, resource costs, and team readiness, while offering concrete kubectl commands and guidance for making an informed adoption decision.
This article details the investigation of sporadic interface timeouts in the Sirius real‑time pricing service, revealing a weekly pattern linked to RAID controller consistency checks that cause IO spikes, logback queue blockage, and ultimately Dubbo client‑side timeouts, and proposes mitigation steps and general performance‑troubleshooting guidelines.
This article explains what a bastion host (jump server) is, why it evolved from traditional jump servers, its core 4A design (authentication, authorization, account, audit), deployment options, common features, authentication methods, and how open‑source and commercial solutions differ, helping organizations improve security and compliance.
The article outlines the DevOps International Standard (ITU‑T Y.3525), its development history, publication, evaluation scheme upgrades, relationship with China’s domestic DevOps standards, and provides a comprehensive overview of industry participation in the DevOps capability maturity model as of April 2024.
The article details how China’s Agricultural Bank of China has leveraged the CAICT DevOps Capability Maturity Model to achieve extensive assessments across dozens of projects, illustrating the bank’s digital transformation, security improvements, and operational benefits within the broader national push toward intelligent, networked enterprises.
When a major operations incident strikes, the safest approach is to prioritize simple, low‑risk actions and accept limited responsibility, as illustrated by real DBA lessons from Oracle RAC failures and a data‑center power‑loss disaster.
This guide explains the purpose and characteristics of development, test, pre‑release, gray‑scale, and production environments, outlines deployment methods, key considerations, phased strategies, environment differences, testing data construction, and synchronization practices to improve software development quality and efficiency.
The ITU‑T Y.3525 DevOps international standard, aligned with China’s domestic DevOps evaluation, was announced on April 25, 2024, detailing its development history, evaluation scheme, upgraded certification, and the relationship with domestic standards, while showcasing industry participation data and contact information for assessments.
Amid China's digital transformation wave, the Agricultural Bank of China has leveraged the CAICT‑led DevOps Capability Maturity Model to achieve record‑setting assessments across multiple projects, demonstrating how systematic DevOps adoption can boost security, efficiency, and innovation in large financial institutions.
This guide explains how to create a shell script that checks SSL certificate expiration dates and integrates it with Zabbix by configuring a user parameter, testing the script, and setting up monitoring items, triggers, graphs, and alerts to ensure services remain available.
A Kubernetes pod repeatedly restarted with exit code 137 despite not hitting its memory limit, revealing that node‑level memory pressure and QoS‑based eviction caused the pod to be killed, and outlining how to diagnose and prevent such OOMKill events.
The article presents a comprehensive Digital Transformation Framework (DTF) for asset‑management firms, detailing how financial, economic, risk, and technical dimensions intertwine, illustrating the composable‑enterprise model, middle‑office evolution, API‑centric automation, and the essential cultural shift required for successful digital change.
This article examines Bilibili's data‑center cabling challenges and presents a smart management platform that digitizes design, automates routing with scenario‑based and shortest‑path algorithms, streamlines task creation and operation, ultimately reducing installation time and improving maintenance efficiency.
This guide presents practical Linux and vSphere techniques—including using rsync for rapid bulk file deletion, detecting newly added iSCSI disks without reboot, safeguarding rm commands, mounting remote filesystems with SSHFS, and quickly adding users to supplementary groups via gpasswd—to boost operational efficiency.
This article details Minsheng Bank’s successful achievement of Level‑3 Continuous Delivery in the CAICT DevOps maturity model, highlighting the assessment process, interview insights from senior tech leaders, measurable efficiency gains, and the broader significance of standardized DevOps practices for enterprise digital transformation.
The article explains how PCDN (P2P CDN) works, why Chinese ISPs are throttling or shutting down broadband connections that use it, and details recent regulatory responses from authorities such as the Jiangsu Provincial Communications Administration.
This article explains the concept of high availability, defines the isolation principle, outlines its implementation across various layers, and presents concrete case studies—including vertical data‑center redesign, dual‑cluster Elasticsearch migration, traffic grouping, and hot‑cold data segregation—to illustrate how isolation improves system resilience.
This article provides a comprehensive guide to Docker container management, covering how to create containers with custom commands, inspect their status and details, monitor progress and resource usage, interact with running containers, and safely start, stop, restart, or remove them using the Docker CLI.
China Southern Airlines' BTRIP and POMS projects passed the CAICT DevOps Continuous Delivery Standard, showcasing how standardized DevOps practices, agile development, CI/CD pipelines, and targeted team initiatives dramatically improved software quality, delivery speed, and operational efficiency in the airline industry.
According to a recent Linux Foundation survey of 418 IT hiring professionals, 37% of companies expanded their technical staff in 2023 while 34% maintained headcount, with cloud providers leading hiring growth, training cuts, longer onboarding times, and rising turnover concerns shaping the evolving tech talent landscape.
This article compiles multiple expert insights explaining why Linux dominates server environments, covering early Windows hosting limitations, ecosystem advantages, performance differences, cost factors, container support, and the evolution of Microsoft’s stance toward open source.
This guide walks you through checking CPU usage, system load, resource consumption, problematic processes, system logs, and performance bottlenecks on a Linux server using common command‑line tools such as top, uptime, pidstat, strace, tail, and perf.
This article analyzes the risks of incorrect B‑end link configurations in fast‑moving business environments and presents a comprehensive protection framework—including system‑level design constraints, front‑end inspections, log‑based alerts, and UI automation—to ensure link accuracy, stability, and rapid issue resolution.
This article explains how to build an offline knowledge base for IT operations by combining large language models with Retrieval‑Augmented Generation (RAG) using LangChain, covering document loading, chunking, embedding, vector storage, and query‑time retrieval with concrete code examples.
This article compiles several Zhihu contributors' perspectives on adopting Kubernetes, weighing cost, operational benefits, potential pitfalls, and practical command‑line examples to help developers decide whether container orchestration truly fits their projects.
On April 8, a Tencent Cloud API outage caused console login failures for nearly 2,000 customers, affecting several dependent services for 87 minutes, and the detailed root‑cause analysis and subsequent improvement actions are presented to enhance system resilience and change management.
On April 8, Tencent Cloud experienced a major service outage caused by a cloud API failure that prevented console login and disrupted several public cloud services for 87 minutes, prompting a detailed post‑mortem that outlines the root cause, impact, and a series of operational and change‑management improvements.
On April 8, 2024, a cloud API failure disrupted Tencent Cloud's console for 87 minutes, affecting 1,957 customers, prompting a detailed incident review that uncovered version‑compatibility and configuration‑data issues and led to a set of operational improvements.
This article introduces various Python-based data backup techniques, covering standard library modules such as shutil, zipfile, and tarfile, as well as database dump tools like pg_dump and mysqldump, and cloud storage options using awscli or boto3, with example code snippets for each method.
This guide explains how to inspect Docker disk usage, remove unused images, containers, volumes, and prune build caches with specific commands and filters, helping developers reclaim storage and keep their Docker environments clean and performant.
This article explains load balancing fundamentals, shows how to configure Nginx for a Tomcat server pool, compares common balancing algorithms, describes OSI‑layer classifications, and outlines typical scenarios such as web farms, application clusters, databases, CDN, and cloud environments.
This article explains what cache pre‑warming is, why it is essential for high‑traffic applications, and compares three practical approaches—scheduled tasks, batch loading, and manual trigger APIs—highlighting their advantages, drawbacks, and typical usage scenarios.
The article examines how a payment platform improves its 24/7 availability by preventing failures, detecting incidents in real time, and implementing rapid recovery measures such as dynamic routing, resource limits, monitoring, logging, and service degradation, while sharing practical Q&A insights.
This article explains what Site Reliability Engineering (SRE) is, outlines the three main layers of SRE work—Infrastructure, Platform, and Business—covers hiring challenges, daily duties such as deployment, on‑call, SLI/SLO management, capacity planning, user support, and offers practical interview and career advice.
The 2023 China DevOps Survey reveals that telecom operators are rapidly advancing their DevOps maturity, with over 60% achieving comprehensive maturity, driven by standardized models, continuous delivery practices, and extensive industry assessments across more than twenty sectors.
The article analyzes a recent outage of Ant's internal flash‑sale service built with AI‑generated low‑code, explains why the AI‑written business logic was not the cause, details the database capacity bottleneck that triggered a snowball effect, and discusses future automation and operational strategies to prevent similar failures.
The 2023 China DevOps Survey reveals that major securities and futures exchanges have significantly advanced their DevOps maturity, with many achieving level‑3 continuous delivery assessments, reduced delivery cycles, higher test coverage, and faster build times, illustrating the impact of digital transformation on IT efficiency.
This article compares three core system‑level high‑availability strategies—circuit breaking, degradation, and rate limiting—explaining their definitions, typical scenarios, design principles, and technical value so leaders can assess ROI and choose the right protection mechanism.
This article reviews the 2023‑2024 DevOps capability maturity assessments of six major Chinese insurance firms, highlighting their certified projects, the continuous delivery standards achieved, and how adopting the CAICT DevOps model drives faster, higher‑quality software delivery and digital transformation across the industry.
The 2023 China DevOps Survey reveals that Chinese banks are increasingly adopting DevOps to boost IT efficiency, with over 100 enterprises completing 351 assessments across multiple standards, showcasing concrete case studies of mobile banking, cloud platforms, and security initiatives that illustrate the practical impact of the CAICT DevOps maturity model.
This article describes how WeChat Pay applied chaos engineering to improve system reliability, detailing the business scenario, challenges of controlling fault injection radius, practical solutions, risk assessment, automation, and the resulting business and tool achievements.
The 2024 report details how major Chinese banks have adopted the CAICT DevOps Capability Maturity Model, showcasing assessment results across multiple standards—continuous delivery, technical operations, security, system tools, BizDevOps and efficiency measurement—highlighting improvements in agility, automation and overall IT efficiency.
This article systematically introduces monitoring fundamentals, core concepts, and architecture, then reviews three widely used open‑source monitoring tools—Zabbix, Open‑Falcon, and Prometheus—detailing their components, advantages, disadvantages, and provides practical advice for selecting the most suitable solution.
The 2023 China DevOps Status Survey reveals that state-owned banks have steadily improved their DevOps maturity, with over 100 enterprises evaluated across 20+ industries, showcasing detailed case studies, assessment results for agile development, continuous delivery, security, and performance standards that illustrate the impact of DevOps on banking digital transformation.
This article explains the concept of graceful shutdown, walks through a Kubernetes pod termination flow, demonstrates a Spring Boot + Nacos example with PreStop hooks, identifies common pitfalls, and provides practical optimizations—including MQ handling, scheduled tasks, traffic control, and actuator shutdown—to achieve reliable, zero‑downtime service termination.
This article explains why Site Reliability Engineering (SRE) emerged, outlines its core responsibilities, required skill set, and how SRE teams use SLOs, monitoring, and scenario drills to improve system reliability, performance, and observability in complex production environments.
This article explains why regular Etcd snapshots are essential for Kubernetes disaster recovery and provides detailed, command‑line procedures for restoring Etcd data on both single‑node and high‑availability clusters, including necessary configuration adjustments and verification steps.
