Containers vs Processes vs Virtual Machines Quiz
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Questions and Answers

What is the technique that consists of running multiple operating systems on a computer simultaneously?

  • Hypervisor
  • Paravirtualization
  • Virtualization (correct)
  • Containerization
  • What is a hypervisor?

  • A machine running on distinct computers
  • A type of container in Docker
  • A process that enhances security
  • A software that creates and executes virtual machines (correct)
  • What is a disadvantage of virtualization mentioned in the text?

  • Augments hardware costs
  • Increases complexity and consumes resources (correct)
  • Improves scalability
  • Facilitates management
  • Which type of virtualization has a hypervisor that runs directly on host hardware?

    <p>Type1 paravirtualization</p> Signup and view all the answers

    What is the main reason for using virtualization according to the text?

    <p>To run multiple OS/applications on the same machine</p> Signup and view all the answers

    In virtualization, what does a hypervisor do?

    <p>Executes virtual machines and allocates hardware resources</p> Signup and view all the answers

    What is the main difference between a Process, Container, and VM?

    <p>Containers are lightweight, isolated groups of processes sharing the same kernel, while Virtual Machines (VMs) have their own kernel and run multiple independent operating systems.</p> Signup and view all the answers

    How does Docker utilize the concept of a distributed system of servers?

    <p>By allowing the emulation of multiple daemons with their respective containers as a service.</p> Signup and view all the answers

    What role does the Docker engine play in managing containers?

    <p>It acts as a client-server application that communicates with the server to manage containers through a REST API.</p> Signup and view all the answers

    How do Containers differ from Virtual Machines (VMs) in terms of resource allocation?

    <p>Containers share the host kernel with minimal overhead, while VMs have their own kernel and require more computer overhead.</p> Signup and view all the answers

    What is the main advantage of having multiple independent operating systems in Virtual Machines (VMs)?

    <p>Enhanced security due to isolation of each operating system environment.</p> Signup and view all the answers

    How does Docker differ from traditional virtualization methods?

    <p>Docker uses a shared kernel approach, whereas traditional virtualization methods like VMs have separate kernels for each instance.</p> Signup and view all the answers

    What command is used to run an interactive Docker container with a specific name?

    <p>docker run -it --name mon-linux-shell ubuntu bash</p> Signup and view all the answers

    Which command is used to remove all unused volumes in Docker?

    <p>docker volume ls -qf dangling=true | xargs -r docker volume rm</p> Signup and view all the answers

    In Docker, what does the command 'docker ps -aq' do?

    <p>Lists all containers, including stopped ones</p> Signup and view all the answers

    What is the purpose of the shebang '#!/bin/bash' at the beginning of a script?

    <p>To inform the operating system about the interpreter to use</p> Signup and view all the answers

    What does the command 'docker images --no-trunc' display?

    <p>Full details of all Docker images</p> Signup and view all the answers

    Study Notes

    Containerization vs Virtualization

    • Containers are created from images and can be stopped, restarted, or transferred to another machine.
    • Containers are isolated groups of processes managed by a shared kernel.

    Dockers

    • Docker is written in Go and is a client-server application.
    • The Docker engine is a client-server application, with the CLI client (docker) communicating with the server (dockerd) through a REST API.
    • Docker allows emulation of a distributed system of servers and orchestration of multiple daemons with their respective containers as a service.

    Virtualization

    • Virtualization is a technique that allows running multiple operating systems on a single computer simultaneously.
    • Virtual Machines (VMs) are simulated operating systems that run on a host computer's hardware resources.
    • Hypervisors create and execute VMs, allocating host resources to guest machines.

    Benefits of Virtualization

    • Reduces downtime by executing multiple OS/applications simultaneously on the same machine.
    • Facilitates management, faster provisioning, and improves scalability, versatility, and resiliency.
    • Allows running software/peripheral that cannot run on host hardware, and enables testing in a controlled environment.

    Drawbacks of Virtualization

    • Increases complexity, and the abstraction layer affects performance, consuming resources.

    Paravirtualization

    • Paravirtualization is a type of virtualization where the hypervisor (type 1) runs directly on host hardware, offering performance close to real hardware.
    • Guest OS must be adapted for paravirtualization.

    Docker Commands

    • docker run -it --name mon-linux-shell ubuntu bash creates a new container from an image.
    • docker exec -it mon-linux-shell sh runs a new command in an existing container.

    Cleaning Up Docker Resources

    • docker ps -aq | xargs -r docker rm -f removes all containers.
    • docker images --no-trunc | awk '{ print $3 }' | xargs -r docker rmi removes unused images.
    • docker volume ls -qf dangling=true | xargs -r docker volume rm removes unused volumes.

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    Related Documents

    slides-docker-en.pdf

    Description

    Test your knowledge on containers, processes, and virtual machines. Learn about the differences between processes, containers, and virtual machines in terms of isolation, resource management, and boot time.

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