Pushing images to the Docker Hub

Here, we will create a Docker image on the local machine, and push this image to the Docker Hub. You need to perform the following steps in this section:

1. Create a Docker image on the local machine by doing one of the following:
   • Using the docker commit sub command
   • Using the docker commit sub command with Dockerfile
2. Push this created image to the Docker Hub.
3. Delete the image from the Docker Hub.

We will use the Ubuntu base image, run the container, add a new directory and a new file, and then create a new image. In Chapter 3, Building Images, we have seen the creation of the Docker image using Dockerfile. You may refer to this to check for details of the Dockerfile syntax.

We will run the container with the name containerforhub from the base ubuntu image, as shown in the following terminal code:

$ sudo docker run -i --name="containerforhub" -t ubuntu /bin/bash
root@e3bb4b138daf:/#

Next, we'll create a new directory and file in the containerforhub container...