This article traces the evolution from early virtualization challenges to modern container technologies, explaining how LXC laid the groundwork for Docker, how Docker differs from virtual machines, and why containers have become essential for cloud‑native development and DevOps workflows.
This article provides a comprehensive, numbered glossary of core operating‑system concepts—including OS fundamentals, kernel and user modes, memory hierarchy, process management, I/O mechanisms, virtualization, and networking—each defined succinctly and illustrated with diagrams to aid understanding.
This article explains the concept of cloud computing, its historical background, core characteristics such as virtualization, scalability and on‑demand provisioning, and describes the three main service models—Infrastructure as a Service, Platform as a Service, and Software as a Service—while highlighting its benefits for enterprises and individuals.
This article explains how Docker solves environment‑configuration challenges, compares containers with virtual machines on startup speed, resource usage, and isolation, outlines Docker’s key advantages such as easy deployment and low cost, and discusses its remaining drawbacks like isolation limits, performance under high concurrency, and storage considerations.
This article traces the history of virtualization from its origins on mainframes through the rise of x86 solutions like VMware, Xen, and KVM, explains full and para virtualization concepts, compares their advantages and drawbacks, and reviews major vendors such as VMware, KVM, and Hyper‑V.
This article explains how cloud computing, big data, and artificial intelligence are tightly linked, tracing the evolution from physical servers to virtualization, describing the flexibility of IaaS, the automation of PaaS, the services of SaaS, and showing how containers and big‑data pipelines enable modern AI workloads.
The article explains the evolution and principles of virtualization backup technologies, detailing VMware's VADP API with its SAN, Hot‑add, and NBD modes, Hyper‑V's VSS‑based backup approach, and Citrix XenServer's backup API, while comparing their architectures and use‑cases.
The article explains what virtualization is, outlines its main types, and shows how it enables efficient software testing by consolidating servers, improving disaster recovery, saving time, increasing availability, reducing complexity, and protecting data, while also noting potential driver, memory, and performance issues.
This article explains how virtualization, especially the open‑source hypervisors KVM and XEN, underpins cloud computing, outlines cloud service and deployment models, compares full and para‑virtualization, and evaluates the strengths and adoption of each technology in today’s major cloud providers.
This guide explains Linux container isolation, compares virtualization with containers, introduces cgroups and namespaces, and provides step‑by‑step commands for installing LXC, creating, configuring, and starting containers, including password reset procedures.
This article provides a clear, beginner‑friendly overview of cloud computing, tracing its evolution from standalone PCs to massive data centers, explaining IaaS/PaaS/SaaS layers, virtualization, hypervisors, OpenStack, Docker containers, and Kubernetes orchestration, and highlighting how major providers deliver these services.
This comprehensive guide explains Docker’s core concepts, advantages over traditional VMs, architecture, essential components, installation steps, common commands, Dockerfile syntax, storage handling, networking modes, and practical examples, providing developers and ops engineers with a solid foundation for container‑based workflows.
This guide walks you through using an automated script to download dependencies, build QEMU 4.1.1, compile the Linux 4.19.1 kernel and BusyBox for ARM64, and install openEuler 1.0 in a virtual machine, including optional GDB debugging and snapshot tips.
This article explains the concept of secure containers, traces their naming history, defines their role in cloud‑native environments, and details the architectures of Kata Containers and gVisor as modern solutions that add isolation layers to improve container security and performance.
This article provides a detailed overview of cloud computing, covering its origins from early virtualization concepts, the evolution of the term in 2006, fundamental characteristics, key enabling technologies such as virtualization, distributed systems, SDN/NFV, cloud‑native stacks, security, AI and big‑data integration, as well as its diverse applications, major market players, and future growth prospects.
This article provides a comprehensive overview of snapshot technology, explaining its definition, the backup challenges it addresses, the creation process, various implementations across file systems, LVM, NAS, disk arrays, virtualization, databases, and different snapshot types such as COW, ROW, incremental and continuous data protection, as well as consistency issues and solutions.
AWS CTO Werner Vogels explained at re:Invent how the Nitro system offloads networking, storage and management to custom hardware, delivering near‑bare‑metal performance, stronger isolation, and a modular architecture that also powers containers, serverless workloads, and next‑generation EC2 instances.
The article analyzes how enterprises are shifting to cloud platforms, the resulting idle data centers, market forecasts for public and private cloud growth, and proposes modernization strategies—including continuous technology updates, workflow optimization, fault simulation, hybrid deployment, and virtualization—to meet the increasing demand for efficient, scalable infrastructure over the next few years.
This tutorial walks you through installing VirtualBox, setting up a CentOS Linux virtual machine, and using Xshell to remotely access the system, covering download links, configuration steps, partitioning details, and essential command-line tips.
This lesson introduces cloud hosts, explaining their core concept, key features such as security, stability, elasticity and high performance, the underlying virtualization and migration technologies, product architecture, disk and image options, and common application scenarios for enterprises and developers.
This article explains the origins, definition, key characteristics such as virtualization, scalability, on‑demand provisioning, flexibility, reliability and cost‑effectiveness of cloud computing, and describes the three main service models—Infrastructure as a Service, Platform as a Service, and Software as a Service.
This article explains Docker’s lightweight container technology, contrasts it with traditional virtual machines, outlines its core components and architecture, and provides step‑by‑step installation instructions for Windows, macOS, and Linux, empowering developers to streamline environments and deployment.
The article explains how Docker and Kubernetes use Linux namespaces to isolate processes, network, IPC, mounts, UTS and users, and employ cgroups to enforce CPU, memory and I/O limits, detailing Docker’s architecture, Kubernetes’s millicore‑based resource model, QoS classes, and the hierarchical pod‑level cgroup structure.
This article provides a comprehensive overview of OpenStack, covering its history from early Amazon web services to its open‑source launch, the governance of the OpenStack Foundation, the evolution of its releases, core components, widespread adoption, and practical guidance for learning the platform.
GPU pass‑through allows a physical GPU on a cloud host to be assigned directly to a virtual machine, delivering near‑bare‑metal performance for AI, deep learning, scientific computing and graphics workloads, with minimal latency, full driver support, and broad compatibility across DirectX and OpenGL applications.
This tutorial walks you through creating a virtual lab by setting up ESXi hosts, configuring a Windows Server domain controller, installing vCenter Server, deploying the vSphere Web Client, and adding SQL Server services, complete with detailed screenshots and troubleshooting tips.
This article explains the SR‑IOV hardware virtualization technology, its core components such as PF and VF, the performance and security advantages it brings to cloud environments, and examines AWS Nitro‑based deployments and Memblaze testing that demonstrate its practical value and future prospects.
This article introduces containers as a PaaS solution, explains Docker's underlying namespace and cgroup mechanisms, compares containers with virtual machines, and outlines their main technologies, advantages, and common pitfalls for developers.
This article provides a step‑by‑step tutorial on installing and configuring KVM on a Linux server, covering CPU virtualization enablement, package installation, module loading, network setup, virtual disk creation, VM deployment, firewall rules, and VNC access.
This article explains the background of GPU communication, details NVIDIA's GPUDirect and its Peer‑to‑Peer features, discusses virtualization challenges, and presents performance measurements on an Alibaba Cloud GN5 instance showing latency reduction and near‑linear scaling for deep‑learning workloads.
Cloud computing provides on‑demand, location‑independent access to shared, virtualized resources through service models (IaaS, PaaS, SaaS) and deployment types (public, private, hybrid, community), enabling cost‑effective elasticity and rapid provisioning while requiring careful balance of security, control, and provider dependence.
This article provides a clear, beginner-friendly overview of cloud computing, explaining core terms such as IaaS, PaaS, SaaS, virtualization, hypervisors, OpenStack, containers, Docker, and Kubernetes, and illustrating how these technologies interrelate to form modern cloud infrastructure.
Since Docker’s 2013 debut and the rise of microservices, many adopt containers without understanding their true advantages; this article explains Docker’s core benefits—lightweight isolation, portability, and efficiency—illustrating why it fits microservice architectures and highlighting common misuse pitfalls.
The article revisits the early days of physical server deployments and virtualization, explains how containers emerged as a lightweight alternative to VMs, discusses their security trade‑offs, and promotes a DevOpsLIVE event on Windows‑Linux containers and Azure Kubernetes.
This guide walks you through seven different approaches to building a home NAS server—from a single‑system DIY setup with a cheap USB flash drive to dual‑boot Windows/DSM configurations, FreeNAS with virtual machines, ESXi/Hyper‑V options, and even a high‑end MacMini media‑center solution—covering hardware choices, software installation steps, and remote management tools.
The article examines Docker’s origins and container technology, contrasts its performance and use cases with OpenStack and KVM, clarifies common misconceptions, and concludes that OpenStack, KVM, and Docker are complementary tools rather than mutually exclusive solutions.
The article examines prevalent misunderstandings about containers—such as startup speed, density, image versioning, auto‑restart, service discovery, and scaling—contrasts them with virtual machine capabilities, and then outlines when containers, micro‑services, and DevOps are truly beneficial across various deployment scenarios.
This article explains how cloud computing, big data, and artificial intelligence are interconnected, detailing the evolution from physical data centers to virtualized resources, the concepts of IaaS, PaaS, SaaS, and how these technologies enable flexible, scalable services for modern applications.
This article explains how OpenStack Ironic enables bare‑metal provisioning as a cloud service, outlines scenarios where physical servers outperform virtual machines, details Ironic’s architecture and evolution, compares billing models, and highlights future trends for bare‑metal cloud offerings.
The article reviews the history of native Android development, describes the shift from small‑app architectures to static and dynamic componentization, examines hybrid and cross‑platform solutions such as WebView‑based, script‑DSL, and independent runtimes, and outlines future trends and strategic choices for mobile teams.
This article explains the fundamental differences between Linux containers and virtual machines, covering resource usage, use‑case scenarios, portability, security considerations, and how to choose the right technology for various application and infrastructure needs.
This guide explains how to manage a Linux desktop by using a single Btrfs partition with subvolumes, label‑based fstab and bootloader configuration, container and VM techniques, and diskless initramfs setups, enabling easy migration, backup, snapshot, and Windows access without reinstalling each system.
The article examines OpenStack’s open‑source advantages—free licensing, broad compatibility, and extensibility—while also highlighting its drawbacks such as limited monitoring, billing, DNS, and storage features, vendor conflicts, high integration costs, frequent releases, and security concerns like authentication, password handling, token management, and data encryption.
The article systematically debunks six common container misconceptions—startup speed, density, image versioning, self‑healing, service discovery, and scaling—by comparing containers with virtual machines, then explains how containers fit into micro‑service and DevOps practices and outlines the scenarios where container adoption truly adds value.
This article explains what libvirt is, its role as an open‑source virtualization library and API, the hypervisors and tools it supports, its daemon architecture, the main API groups, and how client‑server connections are established for managing KVM‑based virtual machines.
This article explains how the Xposed framework works, why it normally requires root, and presents a technical approach using application sandboxing and dual‑app virtualization to enable Xposed modules on non‑root Android phones, including details of framework porting and hook mechanisms.
This article introduces the Xposed framework, explains its architecture and root‑based installation process, then explores alternative non‑root implementation methods using sandbox virtualization and Java hook techniques, detailing dual‑app virtualization, framework migration, and practical code examples for running Xposed modules on unrooted Android devices.
This article explains how cloud computing, big data, and artificial intelligence are interrelated, describing the evolution from physical resource management to virtualized, elastic services, the roles of IaaS, PaaS, and SaaS, and how each technology benefits the others in modern applications.
This case study details the architectural design, key requirements, major decisions, and deployment strategies used to build a province‑wide, networked toll collection system that achieves high availability, low‑latency queries, and efficient data management for millions of daily transactions.
The article details Veritas Velocity’s hybrid‑cloud data replica solution, its architecture, deployment steps, role‑based access, workflow automation with Oracle RMAN, and performance benchmarks that show up to 8.8× faster test‑environment provisioning while halving required manpower.
This tutorial explains how to efficiently clone a powered‑off virtual machine in vSphere Client by creating a dedicated folder, copying the source VM files, adding them to inventory, and powering on the new instance, complete with illustrated steps.
This article explains the principles and detailed three‑stage process—preparation, migration, and switch—of KVM‑based online virtual machine migration on UCloud’s platform, illustrating each step with diagrams and highlighting challenges, benefits, and current limitations of non‑shared storage migration.
This article investigates why virtual machines on an OpenStack IaaS platform experience OOM‑killer terminations despite reserved host memory, analyzes memory usage patterns of qemu‑kvm processes, and proposes practical solutions to mitigate unexpected OOM events.
This comprehensive guide walks through the full lifecycle of enterprise system architecture, covering access‑chain analysis, network and hardware foundations, virtualization and container strategies, layered design, load‑balancing, database high‑availability, service segmentation, and operational safeguards such as CMDB, monitoring, and disaster‑recovery.
This article compares Linux containers and virtual machines, explaining their differing purposes, resource usage, security implications, typical use cases, and how to choose the right technology based on workload requirements and tool ecosystems such as Docker, Kubernetes, VirtualBox, and VMware.
Professor Mei Hong’s comprehensive lecture explores the evolution of software from integrated hardware to virtualized, programmable platforms, highlighting the rise of software-defined networking, cloud services, and the challenges of architecture, quality, security, and lightweight virtualization in the emerging software-defined era.
This article walks through diagnosing and fixing severe Windows I/O performance degradation in a virtualized cloud host by using perf, systemtap, QEMU tracing, and kernel tweaks, revealing that excessive ACPI timer and APIC accesses cause costly VM exits and how enabling the Hyper‑V timer restores expected IOPS.
This article provides a comprehensive overview of Apache CloudStack, detailing its history, core components, deployment and software architectures, supported hypervisors and storage types, advanced networking features, API, comparison with OpenStack, and a brief introduction to the ZStack IaaS solution.
This article explains how to design and implement dual‑active storage solutions combined with virtualization and application clustering, covering industry requirements, storage vendor options, physical and virtual deployment models, and the role of cloud storage and OpenStack Ironic.
This article details the evolution, architecture, deployment, monitoring, and performance optimization of Ultron—360’s internal OpenStack‑based virtualization platform—covering its three development stages, technical stack, automation with Ansible, advanced features like VXLAN and Ceph, and lessons learned from large‑scale operations.
Alibaba Cloud’s chief architect Tang Hong recounts the company’s evolution from its 2009 launch, detailing the Apsara operating system’s milestones, massive scaling achievements, virtualization and container innovations, and future directions in lightweight virtualization, high‑speed hardware, and heterogeneous security, illustrating how open‑source collaboration fuels its growth.
This article provides a detailed introduction to data migration, explaining why and when it is needed, outlining its major challenges such as security, compatibility and downtime, and describing the four primary migration approaches—application, volume‑manager, network, and storage—along with common tools and technologies.
This article compiles a series of detailed data backup resources, covering introductory concepts, backup software architectures, distributed indexing, key features like snapshots and deduplication, virtualization support, storage sizing, cloud optimization, and agent‑less solutions to help practitioners design reliable backup strategies.
This interview chronicles Xiao Li’s unconventional path from a petroleum chemistry graduate to a senior operations director, highlighting his hands‑on experience with system administration, virtualization, cloud computing, and team management across major Chinese tech firms.
This guide explains processor affinity, shows how to isolate host CPUs using the isolcpus kernel parameter, and provides step‑by‑step commands to launch a KVM guest and bind its vCPU threads to dedicated CPUs with taskset, including verification techniques and useful tips.
This article provides a comprehensive overview of cloud computing evolution, covering virtualization, x86 servers, cloud management platforms, container technologies, orchestration tools, resource scheduling, microservices, and distributed databases, while also noting a conference discount promotion.
This article walks beginners through multiple practical approaches for setting up a home NAS server, covering hardware choices, single‑system and dual‑system configurations, virtualization options, recommended software, remote management tools, and even a media‑center upgrade plan.
Li Qiang, Operations Director at TianpiaoChe, shares the step‑by‑step transformation of a legacy e‑commerce infrastructure, covering network latency fixes, hardware re‑allocation, OS tuning, open‑source component upgrades, virtualization changes, and future plans, providing practical insights for large‑scale site operations.
An in‑depth look at Vancl’s massive IT infrastructure—covering network layers, DNS/DHCP design, Windows file services, email systems, instant messaging, AD account management, SCCM automation, and virtualization—offering practical insights for building reliable, scalable operations in large enterprises.
This article compares traditional hypervisor‑based virtualization with Docker container technology, detailing how containers use shared kernels, namespaces, cgroups, AUFS, and device mapper to achieve lightweight isolation and higher resource efficiency.
This guide walks through KVM’s background, features, architecture, and step‑by‑step deployment—including hardware checks, module loading, qemu‑kvm options, bridge configuration, script creation, VM installation, and Libvirt‑based management with virt‑install and virt‑manager—providing a comprehensive tutorial for Linux virtualization.
Virtualization transforms a single physical machine into multiple logical computers, improving resource utilization, while cloudification extends these concepts to create elastic, automated, and distributed infrastructures; the article explores their definitions, benefits, industry adoption, and specific challenges for wireless network products transitioning to cloud-native architectures.
Amid rising data‑storage complexity, twelve innovative startups emerged in 2015‑2016, leveraging flash, disk, and cloud technologies to improve data mobility and management across hierarchical storage tiers, offering solutions ranging from cloud‑native storage networks to SAN arrays and virtualization platforms.
This article demystifies IaaS virtualization by likening hypervisors to a "split‑body" technique, explains the two main hypervisor types, compares Xen and KVM, and highlights the cost and management benefits that virtual machines bring to modern cloud environments.
This article introduces cloud computing fundamentals, explains the SaaS, PaaS, and IaaS service models, and shares why the HULK virtualization team builds its own IaaS using open‑source tools like OpenStack, KVM, and Open vSwitch to reduce cost, increase flexibility, and improve security.
The article provides a comprehensive overview of converged and hyper‑converged infrastructure, discusses typical use cases such as VDI and database acceleration, compares major vendor solutions, and details Nutanix’s product lines, architecture, performance considerations, cloud integration, and micro‑service capabilities.
This article provides a detailed technical overview of server virtualization, covering its historical roots, CPU, memory, I/O and GPU virtualization techniques, hardware-assisted extensions, and various hypervisor architectures, highlighting why virtualization remains essential in modern cloud computing environments.
This article details Shandong Mobile's cloud‑based dual‑active architecture, covering virtualization, VMware HA/DRS, Oracle GoldenGate and ADG optimizations, large Layer‑2 network designs, heartbeat mechanisms to avoid split‑brain, comprehensive testing scenarios, and the resulting reductions in downtime and hardware costs.
The article examines agentless backup technology, comparing its implementation in virtualized and physical environments, detailing supported interfaces, evaluating a real‑world Asigra Cloud Backup case, and discussing security risks, performance impacts, and when traditional agents remain necessary.
This article details Ctrip's deployment of a large‑scale virtual cloud desktop solution for its call center, covering the motivations, original OpenStack architecture, its limitations, the redesigned decoupled architecture, and the operational practices such as resource over‑commit, network tuning, monitoring, and automated testing that ensure stability and scalability.
The article explains how virtualization backup originated with VMware and now spans major platforms such as VMware, Hyper‑V, and Citrix, detailing their backup interfaces (VADP, VSS, Xen API), backup modes (SAN, Hot‑add, NBD), and practical deployment considerations for enterprise data protection.
This article provides a comprehensive overview of container technology, covering its virtualization-based isolation, historical evolution, core Linux features like namespaces and cgroups, layered image architecture, advantages over virtual machines, limitations, and Docker's role in modern cloud‑native deployments.
This article provides a comprehensive technical overview of Linux virtualization technologies, covering hardware-assisted CPU VT, chroot system call, cgroup resource control, namespace isolation, and their integration in container solutions like LXC and Docker, with code snippets and architecture diagrams.
This article outlines ten essential facts about Docker—from its role as a software packaging and deployment tool and its roots in long‑standing container technology, to its cross‑platform support, performance advantages, rapid evolution, competition, and the cautions enterprises should consider before adopting it.
This article examines the compatibility challenges in data‑center environments, outlining how hardware, software, firmware, and networking components across multiple layers—from applications and operating systems to storage, virtualization, and disaster‑recovery—must be coordinated to ensure seamless, efficient operation.
This article outlines eBay's seven key scalability best practices—including functional partitioning, horizontal sharding, avoiding distributed transactions, asynchronous decoupling, stream processing, virtualization, and strategic caching—to illustrate how large‑scale web platforms can achieve linear resource growth and high availability.
This guide explains step‑by‑step how to use LVM logical volumes to build a reusable VM template, configure it, and generate snapshots that allow rapid provisioning of multiple virtual machines while saving storage space.
The article explains how traditional SAN storage creates CPU‑I/O bottlenecks, how Google’s distributed file system inspired hyper‑converged designs that fuse compute and storage, and why tiered storage with SSD and HDD offers scalable, high‑performance infrastructure for modern data‑center workloads.
This article provides a comprehensive overview of cloud computing fundamentals, public/private/hybrid cloud models, SaaS/PaaS/IaaS service layers, virtualization concepts, full and paravirtualization, and detailed step‑by‑step KVM installation, configuration, and performance optimization techniques on Linux.
This article explains the evolution of KVM deployment methods, presents a design for a one‑click fully automated KVM provisioning system, and showcases the actual code and SaltStack states that enable rapid, repeatable virtual machine creation and configuration.
This article traces the evolution of server virtualization from IBM's z/VM mainframe technology through PowerKVM and PowerVM, explains key principles such as partitioning, isolation, and encapsulation, and compares full, para, and hardware‑assisted virtualization while highlighting CPU virtualization challenges.
Server virtualization, a key cloud computing technology, encompasses various architectures—including hosted, bare‑metal, operating‑system level, and hybrid virtualization—each with distinct mechanisms for resource abstraction, and the article compares these models while highlighting trends toward hardware‑assisted solutions such as KVM, Hyper‑V, and VMware.
This article compares LXC and Docker, examining how lightweight container technology can reshape application deployment, scalability, and virtualization, while discussing portability, performance, and the future prospects of containers versus traditional virtual machines.
The article explains how large‑scale website architectures evolve from simple LAMP stacks to modern distributed, service‑oriented, virtualized systems, emphasizing the need for scalability, cost efficiency, middleware reuse, and continuous architectural transformation to meet growing user and development demands.
This article explains Docker containers as software shipping boxes that standardize environments, solve dependency and scaling challenges, and offer a lightweight alternative to virtual machines for efficient, isolated deployment across many servers.
Facing up to 1.6‑1.7 billion daily requests, Momo’s tech director explains how the company built a highly available, low‑latency communication protocol and distributed infrastructure—leveraging virtualization, OpenStack, and cloud servers—to overcome weak mobile networks and serve its massive social‑gaming user base.
This article explains XenServer's high‑performance virtualization features, OVF/OVA export capabilities, snapshot‑based backup methods, disaster‑recovery replication, XenCenter management console functions, integration with Microsoft System Center, and the open XenAPI that enables third‑party automation.
This article explains the fundamentals of container technology, compares containers with virtual machines, describes how containers are managed and deployed using tools like Docker and CoreOS, and shows how container clusters improve resource utilization and scalability in modern DevOps environments.
This article outlines a step‑by‑step methodology for migrating existing services to a virtualized infrastructure, covering performance assessment, test‑environment validation, incremental rollout, full deployment, and constructing business pressure models, with special insights for game‑related workloads.
This article shares practical guidance on moving existing business workloads to a virtualized environment, covering project planning, KVM technology selection, monitoring, disaster recovery, and cloud migration, while highlighting cost savings, rapid deployment, and how to gain stakeholder support.
