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How to use Docker

Installation in Ubuntu:

sudo apt update

sudo apt install apt-transport-https ca-certificates gnupg-agent software-properties-common

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable

sudo apt install docker-ce docker-ce-cli containerd.io


Installation in CentOS:

sudo yum install -y yum-utils

sudo yum-config-manager \
    --add-repo \

sudo yum install docker-ce docker-ce-cli containerd.io

sudo systemctl start docker


Verify Docker installation by running the hello-world image:

sudo docker run hello-world

You should get output similar to this:

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
0e03bdcc26d7: Pull complete
Digest: sha256:e7c70bb24b462baa86c102610182e3efcb12a04854e8c582838d92970a09f323
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:

For more examples and ideas, visit:

To download docker images (in this case ubuntu) we need to use:

sudo docker pull ubuntu


For more pre-configured images check: hub.docker.com


if you want to see what images you have already downloaded use:

sudo docker images


ubuntu latest d70eaf7277ea 6 days ago 72.9MB

To create and run docker container:

docker run


docker run ubuntu -it


Of course you can create a container and run it later, to do this:

docker create

And when you want to start using the container:

docker start <id>

To enter running container with interactive mode and tty use:

docker exec -it <id> /bin/bash


To stop/start/remove docker image:

docker stop/start/rm <id>

To list working docker images:

docker ps -a