Dockerfile

Question 1

What must a Dockerfile begin with

Answer 1

a docker image tag
FROM { image_name }
ex: FROM python:alpine3.10

Question 2

How to specify what the working directory should be

Answer 2

WORKDIR /app

Question 3

Determine what files should be downloaded to the docker container

Answer 3

COPY
ex: COPY . /app

Question 4

How do you make a port available to the outside world

Answer 4

EXPOSE
EX: EXPOSE 5000

Question 5

How to specifie the default program that will execute once the container runs

Answer 5

CMD
EX: CMD python ./launch.py
- This example executes a python file

Question 6

How do you comment code

Answer 6

#

Question 7

How do you execute command s in a new shell on top of the current image and commit the results. The resulting commited image will be used for the next step in the Dockerfile

Answer 7

RUN

Question 8

What are the two forms for RUN

Answer 8

1. RUN <command></command> (shell form)
   
   • ex: RUN echo ‘I know how to use docker!’
2. RUN [“executable”, “param1”, “param2”] (exec form)
   
   • ex: RUN [ “sh”, “-c”, “echo $HOME” ]