Docker Basic

What is Docker?

• A version control system

• A containerization platform

• A programming language

• An operating system

Which of the following best describes a Docker container?

• A lightweight virtual machine

• A package manager

• • A runtime instance of a Docker image

• A command-line tool

What is a Docker image?

• An executable package that includes everything needed to run a software

• A running instance of a container

• A tool for managing databases

• An IDE for developing software

Which command is used to build a Docker image from a Dockerfile?

• docker create

• docker build

• docker run

• docker start

Which instruction in a Dockerfile sets the working directory for any RUN, CMD, ENTRYPOINT, COPY, and ADD instructions that follow it?

• WORKDIR

• RUN

• CMD

• ENV

What is the role of Docker Hub?

• To build Docker images

• To provide cloud-based storage and sharing of Docker images

• To monitor Docker containers

• To deploy Docker applications

What is a .dockerignore file used for?

• To ignore certain Docker commands

• • To exclude files and directories from being added to the Docker image

• To provide default configurations for Docker

• • To list all Docker containers

Which command is used to run a Docker container?

• docker create

• docker build

• docker run

• docker init

What does the FROM instruction in a Dockerfile specify?

• • The base image to use for the Docker image

• The maintainer of the Docker image

• The files to copy into the Docker image

• The command to run when the container starts

Which command is used to list all Docker images on your system?

• docker ps

• docker images

• docker list

• docker show