Install Docker on Ubuntu

Docker is an open-source containerization platform by which you can pack your application and all its dependencies into a standardized unit called a container. Containers are light in weight which makes them portable and they are isolated from the underlying infrastructure and from each other container. You can run the docker image as a docker container in any machine where docker is installed without depending on the operating system.

Docker is popular because of the following:

1. Portability.
2. Reproducibility.
3. Efficiency.
4. Scalability.

Step 1: Remove any docker installation if you have

sudo apt-get remove docker docker-engine deocker.io

Step 2: Install docker

sudo apt-get update
sudo apt-get install docker-ce

OR

sudo apt install docker.io
sudo snap docker install

Step 3: Check if docker is successfully installed in your system

docker --version
sudo docker run hello-world

Step 4: Docker Image

sudo docker images

OUTPUT

REPOSITORY    TAG       IMAGE ID       CREATED        SIZE
hello-world   latest    d2c94e258dcb   8 months ago   13.3kB

Step 5: To view all containers

sudo docker ps -a

OUTPUT

CONTAINER ID   IMAGE         COMMAND    CREATED              STATUS                          PORTS     NAMES
1096276749f4   hello-world   "/hello"   About a minute ago   Exited (0) About a minute ago             jovial_ishizaka

Step 6: To view the latest container you created

sudo docker ps -l

OUTPUT

CONTAINER ID   IMAGE         COMMAND    CREATED              STATUS                          PORTS     NAMES
1096276749f4   hello-world   "/hello"   About a minute ago   Exited (0) About a minute ago             jovial_ishizaka

Reference Video