Docker - A Complete Hands-On Guide - Few More Things

The video tutorial covers essential Dockerfile commands, including FROM, RUN, ENTRYPOINT, CMD, ARG, WORKDIR, COPY, ADD, ENV, MAINTAINER, and EXPOSE. It explains the purpose and usage of each command, highlighting differences between similar commands like COPY and ADD. The tutorial also discusses setting environment variables and specifying the maintainer of a Docker image. Finally, it touches on exposing ports for container access and concludes with encouragement to practice creating custom Docker images.

What is the primary purpose of the 'FROM' instruction in a Dockerfile?

• To expose a port

• To set environment variables

• To run a command in the Docker image

• To specify the base image for the Docker image

Which command would you use to set the default command for a Docker container?

• CMD

• EXPOSE

• RUN

• FROM

What is the key difference between the COPY and ADD instructions in a Dockerfile?

• ADD compresses files, COPY does not

• COPY can handle URLs, ADD cannot

• COPY compresses files, ADD does not

• ADD can handle URLs, COPY cannot

How are environment variables defined in a Dockerfile?

• Using the CMD instruction

• Using the ENV instruction

• Using the FROM instruction

• Using the RUN instruction

What does the EXPOSE instruction in a Dockerfile do?

• It specifies the port on which the container listens

• It copies files into the image

• It runs a command

• It sets the base image