Docker series (Part 9): Basics of Docker file

Dockerfile is the file which helps creating an image.

Lets learn the basics from a basic docker file. You may know more : https://docs.docker.com/engine/reference/builder/

Now, lets learn line by line

1. First we import from some distribution so that we can save our time.

We have imported from debian distribution. It surely can vary.Here we are using the release "buster-slim"

1. Give the way to set environment variables.

1. Run command which runs several shell commands of the distribution you are using.

it uses && to keep the within 1 layer

1. Pointing our log files to stdout & stderr

Basically docker handles all of our logging here .

1. Expose ports

By default no ports are open but we can open them by listing them here

1. Final commands to run

So, these were the basics of Dockerfile.