The Basics

Images, Containers, and the Docker Command

1. Let's start by pulling an image: docker pull python:3.5.7
   a. docker images

• What did we accomplish?
• What's in an image?

2. Let's start a container: docker run -it python:3.5.7 /bin/bash
   a. And take a look around
   b. python --version
   c. pip list
   d. pip install numpy
   e. pip list
   f. Stop the container and compare exit
   g. python --version
   h. pip list
3. Look at all running containers docker ps
4. But where's ours? Here's all containers that exist right now: docker ps -a
5. Exited? Let's start it again docker start -ai <CONTAINER ID>

• Why didn't we need to specify python:3.5.7 again?
• Why didn't we need to specify /bin/bash again?