Assume you are using a normal account, but not root account.
1 Update and Install Necessary Program
ca-certificates and curl are necessary for the following step to add Docker repository to system.
sudo apt update
sudo apt install -y apt-transport-https ca-certificates curl gnupg-agent software-properties-common
2 Add Docker Repository to System
You probably need to check the availablity of the link below, especially if you are working on a different system.
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"
https://download.docker.com/linux/ubuntu/gpgandhttps://download.docker.com/linux/ubuntumay need to be changed according to your system.
3 Install Docker
Install Docker :D
sudo apt update
sudo apt install -y docker-ce docker-ce-cli containerd.io
Add the current user to docker group, so you don’t have to add sudo to use docker.
sudo usermod -aG docker $USER
Save all works on computer/server, and reboot it by following command.
sudo reboot
4 Check Installtion
You don’t need to use sudo for docker operations, if your account is successfully added to docker group.
docker run --rm hello-world
After executing the command above, you should see something like the following on your screen, if docker can run smoothly.
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
s0mevalue: Pull complete
Digest: sha256:xxxxxx
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.
(amd64)
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:
https://hub.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/get-started/
4 Basic Command in Docker
Pull image
docker pull imageNAME:TAG
OR pull the latest image available on your system.
docker pull imageNAME
List all containers
docker ps -a
List all images
docker images
Stop and remove specific running container
docker stop containerID/containerNAME
docker remove containerID/containerNAME
Remove unused image
docker rmi imageNAME:TAG/imageID
For example to remove the
hello-worldimage you just pulled:docker rmi hello-world:latestAnd the image will be removed.
