Unit 1 Chapter 4: Linux Docker Images · Different Docker Tutorial

In this chapter, you will try out various Linux distros through Docker images.

Topics Covered

Basic Docker commands

List of Docker Containers and Images

At the end of the previous chapter, you deleted all containers and images.
Enter the command docker ps -a to show all of the Docker containers currently in your system. Of course, there will be none, and the screen output will be the following:

CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

Enter the command docker images -a to show all of the Docker images currently in your system. Again, there will be none, and the screen output will be the following:

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

Debian Linux Image

Enter the command docker run debian.
The screen output should look something like this:

Unable to find image 'debian:latest' locally
latest: Pulling from library/debian
e9afc4f90ab0: Pull complete 
Digest: sha256:46d659005ca1151087efa997f1039ae45a7bf7a2cbbe2d17d3dcbda632a3ee9a
Status: Downloaded newer image for debian:latest

Enter the command docker run -it debian bash. This starts up a Bash shell within the Debian Linux Docker container.
Enter the command whoami. The output will show that you're the root user. Please note that most Docker images have only a root user and no regular user.
Enter the command cat /etc/os-release. The output will show that you're in Debian Linux.
Enter the command apt-get update. This updates the software package list within your Docker container's Debian environment.
Enter the command apt-get upgrade -y. This updates all the software within your Docker container's Debian environment.
Enter the command exit to return to your host system.

Ubuntu Linux Docker Image

Enter the command docker run ubuntu.
The screen output should look something like this:

Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
d51af753c3d3: Pull complete 
fc878cd0a91c: Pull complete 
6154df8ff988: Pull complete 
fee5db0ff82f: Pull complete 
Digest: sha256:747d2dbbaaee995098c9792d99bd333c6783ce56150d1b11e333bbceed5c54d7
Status: Downloaded newer image for ubuntu:latest

Enter the command docker run -it ubuntu bash. This starts up a Bash shell within the Ubuntu Linux Docker container.
Enter the command whoami. The output will show that you're the root user.
Enter the command cat /etc/os-release. The output will show that you're in Ubuntu Linux.
Enter the command apt-get update. This updates the software package list within your Docker container's Ubuntu environment.
Enter the command apt-get upgrade -y. This updates all the software within your Docker container's Ubuntu environment.
Enter the command exit to return to your host system.

Alpine Linux Docker Image

Enter the command docker run alpine.
The screen output should look something like this:

Unable to find image 'alpine:latest' locally
latest: Pulling from library/alpine
df20fa9351a1: Pull complete 
Digest: sha256:185518070891758909c9f839cf4ca393ee977ac378609f700f60a771a2dfe321
Status: Downloaded newer image for alpine:latest

Enter the command docker run -it alpine sh. This starts up a shell within the Alpine Linux Docker container.
Enter the command whoami. The output will show that you're the root user.
Enter the command cat /etc/os-release. The output will show that you're in Alpine Linux.
Enter the command apk update. This updates the software package list within your Docker container's Alpine environment.
Enter the command apk upgrade. This updates all the software within your Docker container's Alpine environment.
Enter the command exit to return to your host system.

ArchLinux Docker Image

Enter the command docker run archlinux.
The screen output should look something like this:

Unable to find image 'archlinux:latest' locally
latest: Pulling from library/archlinux
238e7cef5675: Pull complete 
231c6d24d179: Pull complete 
1c2b33cecfa4: Pull complete 
9e0e057fb0da: Pull complete 
3b9ccf3aa70b: Pull complete 
508465e7010b: Pull complete 
Digest: sha256:a5bbbcdbb9bbef3b5db3ec97c7bf659162904576bdd2dd7165ffc4fbe812088e
Status: Downloaded newer image for archlinux:latest

Enter the command docker run -it archlinux bash. This starts up a shell within the Arch Linux Docker container.
Enter the command whoami. The output will show that you're the root user.
Enter the command cat /etc/os-release. The output will show that you're in Arch Linux.
Enter the command pacman -Sy. This updates the software package list within your Docker container's Arch Linux environment.
Enter the command pacman -Syu. When prompted, enter "y" to proceed with upgrading all the software within your Docker container's Arch Linux environment.
Enter the command exit to return to your host system.

Cleaning Up

To delete all Docker networks, enter the command docker network prune -f.
To view the list of Docker containers, enter the command docker ps -a.
To delete all of these Docker containers, enter the following commands:

for i in $(docker ps -a -q)
do
  docker kill $i; wait;
  docker rm -f $i; wait;
done;

To view the list of Docker containers, enter the command docker ps -a. This list should now be empty.
To view the list of Docker images, enter the command docker images -a.
To delete all of these Docker images, enter the following commands:

for i in $(docker images -a -q)
do
  docker kill $i; wait;
  docker rmi -f $i; wait;
done;