2.1.2 Running commands in Docker

Create a Bash shell in docker

$ docker run -it ubuntu bash
root@18e78382b32e:/#

Install python

apt-get update
apt-get install -y python3

Run python interactively

# python3
>>> print("Hello Docker")
Hello Docker
>>> exit()
#

Create a Python script and run it

# echo 'print("Hello Docker")' > hello.py
# python3 hello.py
Hello Docker

When you’re done:

root@5aa832cc450b:/# exit
exit

List docker images

$ docker ps -a
CONTAINER ID   IMAGE     COMMAND   CREATED         STATUS                        PORTS     NAMES
5aa832cc450b   ubuntu    "bash"    4 minutes ago   Exited (127) 15 seconds ago             blissful_clarke

Start an existing image and attach

$ CONTAINER_ID=c5e023cab033
$ docker start $CONTAINER_ID
$ docker attach $CONTAINER_ID
# echo "run more commands"
# exit

Delete images

$ docker system prune -a
WARNING! This will remove:
  - all stopped containers
  - all networks not used by at least one container
  - all images without at least one container associated to them
  - all build cache

Are you sure you want to continue? [y/N] y
Deleted Containers:
5aa832cc450b21238fd9e136e42a313ed6560e9aa3b09d7e6bf7413a4b04af3b

Deleted Images:
untagged: ubuntu:latest
untagged: ubuntu@sha256:2b7412e6465c3c7fc5bb21d3e6f1917c167358449fecac8176c6e496e5c1f05f
deleted: sha256:e4c58958181a5925816faa528ce959e487632f4cfd192f8132f71b32df2744b4
deleted: sha256:256d88da41857db513b95b50ba9a9b28491b58c954e25477d5dad8abb465430b

Total reclaimed space: 153.6MB