docker: “build” requires 1 argument. See 'docker build --help'

Question

Trying to follow the instructions for building a docker image from the docker website.

https://docs.docker.com/examples/running_redis_service/

this is the er

Answer 1

In case anyone is running into this problem when trying to tag -t the image and also build it from a file that is NOT named Dockerfile (i.e. not using simply the . path), you can do it like this:

docker build -t my_image -f my_dockerfile .

Notice that docker expects a directory as the parameter and the filename as an option.