The Dockerfile uses parameters inside of it to define what will be done.
Commonly used parameters are:
FROM - by default gets images from dockerhub
RUN - to run the command on the base image
EXPOSE - to open the ports
VOLUME - to map the volumes [from the docker host to the docker container]
COPY - similar to ADD [copy files from the docker host to the docker container]
ADD - similar to COPY - it also copies files from third parties like websites
CMD/ENTRY POINT - similar to RUN, but these command will be executed at the time of the container creation. They won’t be executed while building images. Good to run automatically
ENV - to set the environment variables
WORKDIR - changes the active directory of the container to a specified location if you need to run commands from or in a particular location
