How can I create a Dockerfile from an existing Docker container to customize and extend its functionality?

Do the steps below to create a Dockerfile from an existing Docker container:

1. Start by running the existing container and gaining access to its file system and configurations.
2. Within the container, make the necessary customizations or modifications to extend its functionality according to your requirements.
3. Once you've completed these changes, commit them using the command below:

   `docker commit`

   This will create a new image with the name and tag that you specify.
4. Now, this newly created image incorporates your customizations and can serve as a base for further containerization or distribution.