Learning Docker - Second Edition

Tracking changes inside containers

In the previous section, we demonstrated how to craft a container taking ubuntu as a base image, and then running some basic commands, such as detaching and attaching the containers. In that process, we also exposed you to the docker ps subcommand, which provides the basic container management functionality. In this section, we will demonstrate how we can effectively track the changes that we introduced in our container and compare it with the image from which we launched the container. Let's launch a container in interactive mode, as in the previous section:

$ sudo docker run -i -t ubuntu:16.04 /bin/bash  

Let's change the directory to /home, as shown here:

root@d5ad60f174d3:/# cd /home  

Now, we can create ...