Systèmes d'exploitation et cloud
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Cours, examens, TD, TP et exercices de systèmes d'exploitation et cloud. Thèmes couverts : Linux, Unix, Windows Server, Docker, Kubernetes, virtualisation.
This document discusses scheduling strategies for parallel processing. It analyzes the critical path length and optimization potential with different numbers of processors. The text provides performance metrics for scheduling scenarios with three processors.
This document discusses task scheduling and precedence through an execution tree of associative expressions. It compares two versions of scheduling: the earliest and latest scheduling with respective time calculations. Version 2 is determined to be superior based on the calculations provided.
This document presents an exam problem involving task scheduling and analysis of critical paths in a processing graph. It includes calculations of execution times and processor allocations for a set of tasks. The solutions demonstrate various scheduling methods and their efficiencies.
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 overview of essential Unix commands and shell operations. It covers prerequisites for using the Unix system and explains the structure of command lines. Users will learn about special directories, manual pages, and utility commands to navigate and manage the Unix environment effectively.
This document discusses the installation methods of GNU/Linux operating systems, highlighting the differences between native and swap partitions. It also explains the File Hierarchy Standard (FHS) and the significance of partitioning during installation. Various methods including native installation, virtual machine deployment, and live CDs are explored.
Ce document traite de la gestion des utilisateurs et des groupes dans un système Linux, en mettant l'accent sur l'importance de l'identification et de l'authentification. Il présente également les rôles des différents types d'utilisateurs ainsi que les mécanismes nécessaires pour assurer la sécurité des accès. Les élèves apprendront à gérer les droits d'accès pour maintenir la sécurité des systèmes Unix.
This document provides a practical guide to Shell scripting in Linux. It includes commands for script creation, execution, and management, alongside an introduction to conditional expressions. The document is designed for users looking to automate complex procedures using Shell scripts.
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 provides an overview of cloud services, particularly focusing on Software as a Service (SaaS) and its deployment models. It explores the characteristics of SaaS, examples such as Salesforce CRM and Microsoft Office 365, and addresses concerns regarding data security and vendor reliability. Additionally, it introduces AWS Lambda as a serverless computing service.
This document provides an overview of Platform as a Service (PaaS), explaining its features and differences from traditional development environments. It discusses various commercial and open-source PaaS solutions while highlighting the benefits of using cloud-based development platforms. Notable examples include AWS Cloud9 and IBM Bluemix, emphasizing collaborative coding and elasticity in resource management.
This document covers foundational concepts of cloud computing, including the service models (IaaS, PaaS, SaaS) and deployment models (Private, Public, Hybrid, Community). It details the definitions and distinctions among services like infrastructure, platform, and software provisions. The document emphasizes the benefits of cloud solutions, such as cost savings and scalability, contrasting them with traditional IT setups. Examples include solutions like AWS EC2, S3, and Glacier, alongside discussions of storage methods like Block and Object Storage as well as networking components like Amaz...
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 outlines the fundamental principles of cloud computing as defined by NIST, highlighting its essential characteristics, service models, and deployment models. It emphasizes the economic benefits and the shift towards innovative service delivery while focusing on the roles within cloud architecture. Furthermore, it details the five main actors involved in the cloud computing ecosystem.
This document discusses the behavior of a lazy hamster named Doudou, detailing its activities and probabilities associated with each action. It outlines the transitions between sleeping, eating, and exercising using a Markov process. The analysis focuses on the probabilities of Doudou changing activities or remaining in the same state.
This document introduces virtualization and cloud computing concepts with a focus on storage virtualization. It details methodologies such as SAN, NAS, RAID, and compares their advantages, limitations, and configurations. Hypervisors and storage tools enable dynamic storage allocation and integration of hardware from multiple vendors. Additionally, comparisons of various virtualization solutions like Xen, VMware, OpenVZ, and OpenStack highlight their operational efficiency, compatibility, and deployment capabilities.
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.
The document discusses various types of virtualization in computing, including full virtualization and para-virtualization. It outlines the benefits, limitations, and techniques involved, as well as practical applications in server management. A focus is made on how these technologies can optimize resources and improve efficiency in IT infrastructures.
This document provides step-by-step instructions for UNIX system administration tasks, focusing on group and user management. Students are required to perform operations such as adding and modifying groups and users, managing access rights, and deleting accounts. Practical exercises include creating user accounts, changing directory permissions, and handling file ownership for specific cases. It concludes with cleanup tasks to ensure no traces of work remain.