docker build
docker build -t [tag] .
docker run command on container
sudo docker exec -it <container name> <command>
docker build -t
--tag , -t ----> Name and optionally a tag in the ‘name:tag’ format
dockerfile example
FROM ubuntu:18.04
COPY . /app
RUN make /app
CMD python /app/app.py
docker ARG
$ docker build --build-arg some_variable_name=a_value
how to create docker image from custom filename
cat DockerFile.debian.foo | docker build -t debian.foo -