Docker basics

What is a Dockerfile?

• Docker cannot be build images automatically by reading the instructions from a file called Dockerfile.

• Docker can build audio automatically by reading the instructions from a file called Dockerfile.

• Docker can build images automatically by reading the instructions from a file called Dockerfile.

How to build a Dockerfile?

• $ docker build <path to docker file>

• $ docker build to <path to docker file>

• $ docker build in <path to docker file>

Docker image is created with a series of read-only layers and layer in docker represents instructions on the Dockerfile of the image.

• The hypervisor needs extensive hardware for proper function while docker is implemented on an actual operating system.

• The hypervisor needs extensive software for proper function while docker is implemented on an actual hardware system.

Docker can build images automatically by reading the instructions from:

• docker.config

• docker.json

• docker.yaml

• Dockerfile

What does the FROM instruction do in a Dockerfile?

• FROM creates a layer from a base Docker image.

• FROM specifies the creator of the image

• FROM is an invalid instruction

• FROM adds files from your Docker client’s current directory

What does the COPY instruction do in a Dockerfile?

• COPY makes a copy of your Dockerfile

• COPY adds files from your Docker client’s current directory

• COPY creates a copy of your running container

• COPY creates a copy of your image

Which command is used for running the images as a container?

• $ docker PS

• Sudo docker run container name

• $ Sudo docker run -i -t alpine /bin/bash

• All of the above

How many private repositories are allowed for a individual on Docker hub?

• 1

• 2

• 3

• 4

Which of the following is a cloud-hosted service from Docker that provides registry capabilities for public and private content?

• Docker Hub

• Docker Cloud

• Docker Swarm

• Docker Compose

Which of the following is a text document that contains all the commands a user could call on the command line to assemble an image?

• Docker Cloud

• Dockerfile

• Docker Kitematic

• Docker Compose