Docker is an application that simplifies the process of managing application processes in containers. Containers let you run your applications in resource-isolated processes. They’re similar to virtual machines, but containers are more portable, more resource-friendly, and more dependent on the host operating system.
This simple tutorial will show you how to download Docker, enable or disable Docker upon system reboot/startup, and change usage permissions for users in six easy steps.
sudo apt update -y && sudo apt upgrade -y
Download and Install Docker
Enter the following command to download and install the Docker package.
$ sudo apt install docker.io
$ sudo systemctl enable --now docker
To disable it again, just following command.
$ sudo systemctl disable --now docker
Set User Privileges
This step will show you how to give privileges to any user with Docker. In this tutorial I will use “devninja” user account what are giving permission.
sudo usermod -aG docker devninja
Check Docker Version
You can check the version of Docker with the command
$ docker --version
Using the Docker Command
docker [option] [command] [arguments]
Usage: docker [OPTIONS] COMMAND A self-sufficient runtime for containers Options: --config string Location of client config files (default "/home/harz/.docker") -c, --context string Name of the context to use to connect to the daemon (overrides DOCKER_HOST env var and default context set with "docker context use") -D, --debug Enable debug mode -H, --host list Daemon socket(s) to connect to -l, --log-level string Set the logging level ("debug"|"info"|"warn"|"error"|"fatal") (default "info") --tls Use TLS; implied by --tlsverify --tlscacert string Trust certs signed only by this CA (default "/home/harz/.docker/ca.pem") --tlscert string Path to TLS certificate file (default "/home/harz/.docker/cert.pem") --tlskey string Path to TLS key file (default "/home/harz/.docker/key.pem") --tlsverify Use TLS and verify the remote -v, --version Print version information and quit Management Commands: builder Manage builds config Manage Docker configs container Manage containers context Manage contexts image Manage images manifest Manage Docker image manifests and manifest lists network Manage networks node Manage Swarm nodes plugin Manage plugins secret Manage Docker secrets service Manage services stack Manage Docker stacks swarm Manage Swarm system Manage Docker trust Manage trust on Docker images volume Manage volumes Commands: attach Attach local standard input, output, and error streams to a running container build Build an image from a Dockerfile commit Create a new image from a container's changes cp Copy files/folders between a container and the local filesystem create Create a new container diff Inspect changes to files or directories on a container's filesystem events Get real time events from the server exec Run a command in a running container export Export a container's filesystem as a tar archive history Show the history of an image images List images import Import the contents from a tarball to create a filesystem image info Display system-wide information inspect Return low-level information on Docker objects kill Kill one or more running containers load Load an image from a tar archive or STDIN login Log in to a Docker registry logout Log out from a Docker registry logs Fetch the logs of a container pause Pause all processes within one or more containers port List port mappings or a specific mapping for the container ps List containers pull Pull an image or a repository from a registry push Push an image or a repository to a registry rename Rename a container restart Restart one or more containers rm Remove one or more containers rmi Remove one or more images run Run a command in a new container save Save one or more images to a tar archive (streamed to STDOUT by default) search Search the Docker Hub for images start Start one or more stopped containers stats Display a live stream of container(s) resource usage statistics stop Stop one or more running containers tag Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE top Display the running processes of a container unpause Unpause all processes within one or more containers update Update configuration of one or more containers version Show the Docker version information wait Block until one or more containers stop, then print their exit codes Run 'docker COMMAND --help' for more information on a command. To get more help with docker, check out our guides at https://docs.docker.com/go/guides/
To view the options available to a specific command, type:
docker docker-subcommand --help
To view system-wide information about Docker, use:
you can search for images available on Docker Hub by using the docker command with the search subcommand. For example, to search for the Ubuntu image, type:
docker search ubuntu
the output will be similar to this:
Output NAME DESCRIPTION STARS OFFICIAL AUTOMATED ubuntu Ubuntu is a Debian-based Linux operating sys… 10908 [OK] dorowu/ubuntu-desktop-lxde-vnc Docker image to provide HTML5 VNC interface … 428 [OK] rastasheep/ubuntu-sshd Dockerized SSH service, built on top of offi… 244 [OK] consol/ubuntu-xfce-vnc Ubuntu container with "headless" VNC session… 218 [OK] ubuntu-upstart Upstart is an event-based replacement for th… 108 [OK] ansible/ubuntu14.04-ansible Ubuntu 14.04 LTS with ...
Execute the following command to download the official ubuntu image to your server/computer:
docker pull ubuntu
Using default tag: latest 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 docker.io/library/ubuntu:latest
Test Docker by running the following command, which will open a container to run the Hello World command.
$ docker run hello-world
In this tutorial you install Docker basically, if you get any issue you can comment on this post 🙂