Dockerlab 102 Interacting with Docker Container

Step 0 : Create docker hub account. https://hub.docker.com

Step 1 : Open Play with Docker or login in below with your docker hub account.

Step 2 : Click on start

Step 3 : It will start a 4 hr session, click on + ADD NEW INSTANCE

Step 4 : Click in terminal and press enter.

Step 5 :

docker pull ubuntu

docker pull ubuntu:18.04

docker pull ubuntu:20.10

docker pull ubuntu:16.04

docker pull alpine

docker pull alpine:3.12.0

docker pull alpine:3.11.6

docker pull alpine:3.10

  • pull command fetches image from docker registry and saves it in your system.

  • In this case docker registry is docker hub, we will practice changing registry in future labs.

Step 6 : docker images

  • docker images command is used to check images on local system

Step 7 : docker images -a

  • -a will show all images

Step 8 : docker images ubuntu

  • this command will list all ubuntu images with different tags

Step 9 : docker image ls

  • list all images on local system

Step 10 : docker container run alpine ls -l

  • docker container run will start a container and run command in new container

  • This will run ls -l command in container and print output. Container will exit after running this command.

Step 11 : docker container run alpine echo "hello from alpine"

  • This will run echo command and container will shutdown after running this command.

Step 12 : docker container run alpine /bin/sh

  • This will do nothing as container will run command and exit

Step 13 : docker container run -it alpine /bin/ash

echo "hello world" > hello.txt

  • This will take you inside new container, you can run any alpine supported command and exit once you are done

Step 14 : docker container ls

  • This command will display all running containers

Step 15 : docker container ls -a

  • -a will display all containers with all status

  • All containers have isolated file system

Step 16 : docker container start <container ID>

  • you can start an exited container, you can use just first 4 digit of container id, full id is not required.

Step 17: docker container exec <container ID> ls

  • File we created in earlier will be there even if container exit.

  • You will loose file if container is removed more on that in future labs.