It can be useful to commit a container's file changes or settings into a new image. This lets you debug a container by running an interactive shell, or export a working dataset to another server.
Commits do not include any data contained in mounted volumes.
By default, the container being committed and its processes will be paused while the image is committed. This reduces the likelihood of encountering data corruption during the process of creating the commit. If this behavior is undesired, set the --pause option to false (by default is true).
one example
# get ubuntu image and run it
docker run -t -i ubuntu /bin/bash
# create a new directory there
touch /TEST
exit
# create an image from the last conatiner created
docker commit $(docker ps -lq) test-image
# deploy it to registry
docker tag test-image your_domain/test-image
docker push your_domain/test-image