Cours - Systèmes d'exploitation et cloud
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Cours de systèmes d'exploitation et cloud, partagés par des étudiants et des enseignants. Thèmes couverts : Linux, Unix, Windows Server, Docker, Kubernetes, virtualisation.
The document introduces multi-machine scheduling problems aiming to optimize chosen criteria while respecting constraints. It elaborates on parallel machine scenarios and discusses flow shop and job shop setups, detailing rules and algorithms for optimal task sequencing and allocation, including LPT, SPT, Johnson's algorithm, and heuristics like CDS. Examples illustrate these methodologies, highlighting their application and outcomes, with software tools like Lekin and Cplex mentioned for resolution practices.
The document introduces scheduling problems for single-resource systems, aiming to optimize criteria like makespan and tardiness while respecting constraints. Methodologies include modeling and solving with tools like Lekin and CPLEX, focusing on NP-hard cases. Common scheduling problems analyzed range from minimizing processing times to handling precedence constraints. Optimization theories and heuristics, such as EDD and MDD, are discussed with examples.
This document comprehensively introduces scheduling problems in various contexts, including production systems, projects, and administration. It elaborates on classification schemas, key parameters, and methodologies to optimize resource allocation while balancing constraints such as precedence and resource availability. Practical examples in fields such as aeronautics, IT, and construction are covered alongside an exploration of decision-making processes across strategic, tactical, and operational levels. Core scheduling typologies like single-machine, flow shop, and job shop are explained...
This document details the application of Lean Six Sigma methodologies to improve production processes within Electronic Manufacturing Services (EMS). Core methods include Value Stream Mapping, statistical analysis, and the DMAIC workflow (Define, Measure, Analyze, Improve, Control). Key findings include the identification of inefficiencies via non-conformity analysis and process redesign, resulting in enhanced productivity and quality metrics. Implemented improvements directly impacted the satisfactory achievement of defined project objectives.
This document delves into the architectural models for application hosting and SaaS maturity levels. It analyzes single-tier and N-tier architectures, their use cases, advantages, and limitations, emphasizing scalability and security. The SaaS maturity model is broken into four levels, ranging from ad-hoc/custom setups to scalable, multi-tenant-efficient solutions. Detailed examples and real-world applications are presented, enhancing understanding for cloud computing architects and developers.
This document provides a detailed overview of Kubernetes, a powerful open-source container orchestration platform. It covers the essential features such as resource scheduling, self-healing, service discovery, and scalability. Methodologies include the usage of API-driven declarative configurations, YAML manifests for object specifications, and diverse worker/control plane architectures. Extensions and integrations for storage, monitoring, and automation emphasize its flexibility and utility in modern cloud environments.
This document provides an in-depth exploration of type 1 hypervisors, which directly interact with hardware without intermediaries like operating systems. The advantages include enhanced performance, resource optimization, and high availability for hosting numerous virtual machines (VMs) in enterprise environments. Commercial examples like VMware ESXi, Hyper-V, KVM, and Xen are highlighted, as their market positions, costs, and unique configurations are discussed. The article concludes with a comparison of the use cases and differences between type 1 and type 2 hypervisors, emphasizing that...
This document provides an in-depth exposition of the GNU/Linux file management system. It elaborates on the structure and types of files, such as regular, directories, special files, symbolic links, and interprocess communication objects like pipes and sockets. Key aspects covered include the file metadata stored in inodes, file permissions and access control using chmod and umask, and the distinct hierarchical file system structure adhering to FHS standards. It also explores task scheduling mechanisms like cron and at, emphasizing system administration utilities and best practices for user...
Platform as a Service (PaaS) provides a managed development environment hosted by external providers, offering flexibility and scalability compared to traditional development setups. It eliminates the need for manual configuration, supports multiple tenants, and is typically available via a web browser. Notable examples include Cloud9 by AWS and Bluemix by IBM, complemented by open-source tools like CloudFoundry. PaaS simplifies development processes, enhances the availability of tools and runtimes, and integrates modern practices like DevOps for streamlined collaboration and continuous del...
This document explores virtualization in computing, detailing key methodologies such as full virtualization, para-virtualization, and containerization. Full virtualization emulates entire physical machines, while para-virtualization uses modified operating systems for performance enhancements. Isolation techniques like chroot and LXC introduce lightweight, resource-efficient environments leading to containerization, which optimizes application hosting. Performance comparisons highlight benefits of containerization over traditional virtualization for resource utilization and scalability.
The document provides an in-depth exploration of virtualization methodologies, focusing on hypervisors, types of virtualization, and major software solutions like XEN, KVM, and VMware. It analyzes storage virtualization and its applications, transitioning toward cloud computing models such as SAAS, PAAS, and IAAS. Cloud architectures, including private, public, and hybrid, are discussed along with their benefits. The main cloud service providers such as Amazon, Microsoft, and Google are compared. The report concludes by examining the integration of these technologies into modern IT infrastr...
This document covers virtualization and cloud computing concepts. It includes various types of hypervisors and cloud architectures. Additionally, it discusses key industry players in the cloud space.
The text explains the historical and philosophical principles behind the Free Software License (FS) and its evolution into the General Public License (GPL), emphasizing freedoms like usage, modification, and redistribution. It highlights the concept of 'copyleft,' designed to ensure software remains free by mandating derivative works adhere to the same licensing structure. Examples of free software tools such as GNU, GIMP, and Audacity are mentioned. Additionally, it provides an overview of command-line basics, types of shell interpreters, and internal vs external commands with examples.
Ce document explore le modèle CMMI, une méthode standardisée pour améliorer les processus et garantir la maturité organisationnelle dans les projets de développement. Il identifie les origines du besoin (manque de visibilité, dépassement de budgets, produits défectueux) et détaille les concepts fondamentaux tels que la structure du processus, les niveaux de maturité (de 1 à 5), et les meilleures pratiques. En présentant deux approches (étagée et continue), le texte souligne les implications en termes de coût, bénéfices mesurables, et impact organisationnel basé sur l'adoption efficace de pr...
This course covers the fundamentals of operating systems with a focus on Linux. Students will learn shell scripting, text manipulation, and command line operations. The course includes theoretical knowledge and practical sessions.
Ce document introduit les concepts fondamentaux des systèmes d'exploitation (OS), définissant leurs rôles entre le matériel et l'utilisateur. Il couvre les différents types de systèmes d'exploitation en fonction des équipements, ainsi que les interactions entre le matériel, les applicatifs et les utilisateurs. De plus, il aborde l'importance de l'optimisation des ressources et la loi de Moore dans le développement des OS.
ISTIC 2018-2019 Communication entre processus par tubes anonymes Amira BELHEDI belhedi. amira@yahoo. fr R f rence livre Programmation syst me en C sous Linux Signaux, processus, threads, IPC et sockets Communication par les tubes (pipes) Tube de communication: canal ou tuyau (en anglais pipe) dans lequel un processus peut crire des donn es (producteur, crivain ou r dacteur) et un autre processus peut les lire (consommateur).
Rappel interblocage des processus Amira BELHEDI belhedi. amira@yahoo. fr ISTIC 2018 Processus et ressources L'utilisation d'une ressource passe par les étapes suivantes – Demande de la ressource : Si l'on ne peut pas satisfaire la demande il faut attendre.
This document provides an extensive overview of cloud computing, focusing on service models such as SaaS, PaaS, IaaS, and auxiliary services like AWS Lambda and BPaaS. It further categorizes deployment models, discussing public, private, hybrid, and community cloud infrastructure, highlighting their use-cases, benefits, and limitations. Examples of SaaS solutions, like Salesforce CRM and Microsoft Office 365, are analyzed, emphasizing efficiency, collaboration, and cost reduction. The document also examines challenges related to data security, vendor reliability, and evolving organizational...
This document outlines foundational concepts of cloud computing based on the NIST framework. It defines the five essential characteristics of cloud services, the three service models (SaaS, PaaS, IaaS), and the four deployment models (Private, Public, Community, Hybrid). Additionally, it elaborates on the roles of various actors in the ecosystem—Cloud Consumer, Provider, Broker, Carrier, and Auditor—while emphasizing service-level agreements and their importance for performance guarantees. The document highlights the significance of vendor-agnostic designs and the strategic advantages of cl...
This document provides an in-depth exploration of virtualization and cloud computing methodologies. It outlines various virtualization techniques, such as full virtualization, para-virtualization, and OS-level isolation, and discusses their advantages and limitations. The document highlights modern practices like containerization, comparing them to virtual machine-based approaches, and demonstrates how hardware-assisted virtualization enhances performance. It concludes with practical applications across clusters, including load balancing, high availability, and resource scalability.
This document focuses on fault tolerance within distributed systems. It introduces basic definitions and concepts such as reliability, availability, and safety, and classifies different types of system failures (e.g., omission, timing, Byzantine). It emphasizes fault tolerance techniques including detection, localization, isolation, and repair, as well as recovery methods like backward and forward recovery. Statistical models like Mean Time To Failure (MTTF) and Mean Time To Repair (MTTR) are highlighted to measure reliability and availability.
This document covers the principles of virtualization and its various forms, including application, network, and storage virtualization. It highlights the importance of virtualization in cloud computing and provides practical workshops for hands-on experience. Additionally, it examines the advantages and disadvantages of virtualization techniques.
This document provides a comprehensive overview of WSO2 ESB, an open-source enterprise service bus designed for efficient integration of services and applications. It discusses its lightweight, flexible nature and powerful capabilities, including message mediation, transformation, and routing. The document also elaborates on the architectural components like service mediation, API management, and governance registry while emphasizing its scalability and suitability for both cloud and on-premise deployments. Finally, the presentation highlights the numerous benefits of WSO2, such as agility,...