Dockerfile - Creating dockerfile

Question

I'm trying to pull tomcat from the Dockerfile I have created and pull centos using the command:

FROM centos
RUN docker run -it tomcat

Then now I'm creating a new Dockerfile, how do I pull the tomcat from the Dockerfile I've created above without pulling from the Docker Hub?

Answer 1

First you need to build your Dockerfile into a docker image:

docker build -t my-custom-image .

Now you can base another docker container from the image you created, just like you were doing with centos :

FROM my-custom-image