Install Docker Ubuntu

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In this blog post, we'll look at How to install docker on Ubuntu 18.04 Server. Docker provides an image-based deployment model which makes it easy to package an application with its all dependencies and share across multiple environments. In this tutorial we’ll cover how to install Docker on a Ubuntu 18.04 machine and explore the basic Docker concepts and commands. Before continuing with this tutorial, make sure you are logged in as a user with sudo privileges. All the commands in this tutorial should be run as a non-root user. In this section, we will learn how to install Docker on Ubuntu, MacOS, and Windows. 1.1 Installing Docker on Ubuntu To install docker on Ubuntu 16.04, first add the GPG key for the official Docker repository to the system. Docker is an application that makes it simple and easy to run application processes in a container, which are like virtual machines, only more portable, more resource-friendly, and more dependent on the host operating system. For a detailed introduction to the different components of a Docker.

You've heard of Docker, and you know that it's one of the best means of packaging your application into a standardized unit for deployment—you want that..but you're not sure how to get it up and running.

To the uninitiated, Docker looks to be a complicated mess of an install. If you're unsure where to start, the installation can be daunting. Truth be told, the installation is quite simple. I'll help demystify that very process, so you can have Docker installed and ready to serve.

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I'll demonstrate this process on a fresh installation of Ubuntu 16.04. The entire installation process is handled via command line, so prepare to type.

SEE: Why the container community is wrong to whine about Docker

Update apt and add the key and repo

The first thing to do is update apt. To do this, open a terminal window and issue the command sudo apt-get update. Once that finishes, a new GPG key must be added for the repository used to install Docker. To add the new key, issue the following command:

The next step is to add the Docker repository. From the terminal window, create the new file with the command sudo nano /etc/apt/sources.list.d/docker.list and add the following contents:

Save and close that file. Once again, update apt with the command sudo apt-get update.

Install the dependencies

Before we install Docker, there are a couple of dependencies that must be taken care of—these can all be handled with a single command. Go back to your terminal window and issue the following:

You're ready to install Docker.

SEE: Netflix on containers: Five ways they'll boost our business, from lower costs to higher productivity

Installing, starting, and testing Docker

Docker can now be installed with a single command. From the terminal, issue the following:

sudo apt-get install docker-engine

When the installation completes, you'll want to add your user to the Docker group with the command:

sudo usermod -aG docker $USER

Install docker on centos

Once your user has been added, you can run the docker command as your standard user.

In order to run a Docker command, you must first fire up Docker with the command sudo service docker start. You can now test to make sure Docker is installed and running properly by downloading the hello-world test image. From the terminal window, issue the command docker run hello-world. The hello-world image will download and run (Figure A).

Figure A

The Docker hello-world image in action.

Docker is ready to serve

Congratulations! You now have a working Docker installation..ready to deploy your applications. You can head over to the Docker Hub and find other applications to run. Some of these applications will require you to create a docker-compose.yaml file. Say, for instance, you want to install WordPress with Docker. To do this, create the folder my-wordpress. Change into that directory and create the docker-compose.yaml file with the following contents (do not use tabs for indentation, as that will cause Docker to error out).

Save that file and then, from within the my-wordpress directory, issue the command docker-compose up -d and WordPress will build. Once the build is complete, point your browser to http://IP_OF_SERVER:8000 (IP_OF_SERVER is the actual IP address of the machine running the Docker-installed instance of WordPress) and walk through the WordPress setup.

You've officially installed your first application from Docker.

Keep installing

You can go through the Docker Hub and check out the listed apps. Each installation will be different (some can be pulled directly from the Hub, without a .yaml file), but Docker makes installing these applications incredibly simple. And once you have your own software ready, you can deploy it through Docker as well.

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Also see

  • Docker rocker: container technology usage doubles; serious money follows (ZDNet)
  • Raspberry Pi and Docker: Tiny $35 computer gets major new release of HypriotOS (ZDNet)
  • How to spin up OrangeHRM as a virtual machine in less than 5 minutes (TechRepublic)
  • How to run VirtualBox virtual machines from the command line (TechRepublic)
  • How to install openDCIM on Ubuntu to simplify data center management (TechRepublic)
  • How to install a LAMP server on openSUSE (TechRepublic)
  • Digital transformation, the Red Hat way (Tech Pro Research)
Estimated reading time: 12 minutes

To get started with Docker Engine - Community on Ubuntu, make sure youmeet the prerequisites, theninstall Docker.

Prerequisites

Docker EE customers

To install Docker Enterprise Edition (Docker EE), go toGet Docker EE for Ubuntuinstead of this topic.

To learn more about Docker EE, seeDocker Enterprise Edition.

OS requirements

To install Docker Engine - Community, you need the 64-bit version of one of these Ubuntuversions:

  • Disco 19.04
  • Cosmic 18.10
  • Bionic 18.04 (LTS)
  • Xenial 16.04 (LTS)

Docker Engine - Community is supported on x86_64 (or amd64), armhf, arm64, s390x(IBM Z), and ppc64le (IBM Power) architectures.

Uninstall old versions

Older versions of Docker were called docker, docker.io , or docker-engine.If these are installed, uninstall them:

It’s OK if apt-get reports that none of these packages are installed.

The contents of /var/lib/docker/, including images, containers, volumes, andnetworks, are preserved. The Docker Engine - Community package is now called docker-ce.

Supported storage drivers

Ubuntu Install Docker Compose

Docker Engine - Community on Ubuntu supports overlay2, aufs and btrfs storage drivers.

Note: In Docker Engine - Enterprise, btrfs is only supported on SLES. See the documentation onbtrfs for more details.

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For new installations on version 4 and higher of the Linux kernel, overlay2is supported and preferred over aufs. Docker Engine - Community uses the overlay2storage driver by default. If you need to use aufs instead, you need toconfigure it manually. See aufs

Install Docker Engine - Community

You can install Docker Engine - Community in different ways, depending on your needs:

  • Most usersset up Docker’s repositories and installfrom them, for ease of installation and upgrade tasks. This is therecommended approach.

  • Some users download the DEB package andinstall it manually and manageupgrades completely manually. This is useful in situations such as installingDocker on air-gapped systems with no access to the internet.

  • In testing and development environments, some users choose to use automatedconvenience scripts to install Docker.

Install using the repository

Before you install Docker Engine - Community for the first time on a new host machine, you needto set up the Docker repository. Afterward, you can install and update Dockerfrom the repository.

Set up the repository

  1. Update the apt package index:

  2. Install packages to allow apt to use a repository over HTTPS:

  3. Add Docker’s official GPG key:

    Verify that you now have the key with the fingerprint9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88, by searching for thelast 8 characters of the fingerprint.

  4. Use the following command to set up the stable repository. To add thenightly or test repository, add the word nightly or test (or both)after the word stable in the commands below. Learn about nightly and test channels.

    Note: The lsb_release -cs sub-command below returns the name of yourUbuntu distribution, such as xenial. Sometimes, in a distributionlike Linux Mint, you might need to change $(lsb_release -cs)to your parent Ubuntu distribution. For example, if you are using Linux Mint Tessa, you could use bionic. Docker does not offer any guarantees on untestedand unsupported Ubuntu distributions.

Install Docker Engine - Community

  1. Update the apt package index.

  2. Install the latest version of Docker Engine - Community and containerd, or go to the next step to install a specific version:

    Got multiple Docker repositories?

    If you have multiple Docker repositories enabled, installingor updating without specifying a version in the apt-get install orapt-get update command always installs the highest possible version,which may not be appropriate for your stability needs.

  3. To install a specific version of Docker Engine - Community, list the available versions in the repo, then select and install:

    a. List the versions available in your repo:

    b. Install a specific version using the version string from the second column, for example, 5:18.09.1~3-0~ubuntu-xenial.

  4. Verify that Docker Engine - Community is installed correctly by running the hello-worldimage.

    This command downloads a test image and runs it in a container. When thecontainer runs, it prints an informational message and exits.

Docker Engine - Community is installed and running. The docker group is created but no usersare added to it. You need to use sudo to run Docker commands.Continue to Linux postinstall to allownon-privileged users to run Docker commands and for other optional configurationsteps.

Upgrade Docker Engine - Community

To upgrade Docker Engine - Community, first run sudo apt-get update, then follow theinstallation instructions, choosing the new version you wantto install.

Install from a package

If you cannot use Docker’s repository to install Docker Engine - Community, you can download the.deb file for your release and install it manually. You need to downloada new file each time you want to upgrade Docker.

  1. Go to https://download.docker.com/linux/ubuntu/dists/,choose your Ubuntu version, browse to pool/stable/, choose amd64,armhf, arm64, ppc64el, or s390x, and download the .deb file for theDocker Engine - Community version you want to install.

    Note: To install a nightly package, change the wordstable in the URL to nightly.Learn about nightly and test channels.

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  2. Install Docker Engine - Community, changing the path below to the path where you downloadedthe Docker package.

    The Docker daemon starts automatically.

  3. Verify that Docker Engine - Community is installed correctly by running the hello-worldimage.

    This command downloads a test image and runs it in a container. When thecontainer runs, it prints an informational message and exits.

Docker Engine - Community is installed and running. The docker group is created but no usersare added to it. You need to use sudo to run Docker commands.Continue to Post-installation steps for Linuxto allow non-privileged users to run Docker commands and for other optionalconfiguration steps.

Upgrade Docker Engine - Community

To upgrade Docker Engine - Community, download the newer package file and repeat theinstallation procedure, pointing to the new file.

Install using the convenience script

Docker provides convenience scripts at get.docker.comand test.docker.com for installing edge andtesting versions of Docker Engine - Community into development environments quickly andnon-interactively. The source code for the scripts is in thedocker-install repository.Using these scripts is not recommended for productionenvironments, and you should understand the potential risks before you usethem:

  • The scripts require root or sudo privileges to run. Therefore,you should carefully examine and audit the scripts before running them.
  • The scripts attempt to detect your Linux distribution and version andconfigure your package management system for you. In addition, the scripts donot allow you to customize any installation parameters. This may lead to anunsupported configuration, either from Docker’s point of view or from your ownorganization’s guidelines and standards.
  • The scripts install all dependencies and recommendations of the packagemanager without asking for confirmation. This may install a large number ofpackages, depending on the current configuration of your host machine.
  • The script does not provide options to specify which version of Docker to install,and installs the latest version that is released in the “edge” channel.
  • Do not use the convenience script if Docker has already been installed on thehost machine using another mechanism.

This example uses the script at get.docker.com toinstall the latest release of Docker Engine - Community on Linux. To install the latesttesting version, use test.docker.com instead. Ineach of the commands below, replace each occurrence of get with test.

Warning:

Always examine scripts downloaded from the internet beforerunning them locally.

Install Docker Ubuntu 12.04

If you would like to use Docker as a non-root user, you should now consideradding your user to the “docker” group with something like:

Remember to log out and back in for this to take effect!

Warning:

Adding a user to the “docker” group grants them the ability to run containerswhich can be used to obtain root privileges on the Docker host. Refer toDocker Daemon Attack Surfacefor more information.

Docker Engine - Community is installed. It starts automatically on DEB-based distributions. OnRPM-based distributions, you need to start it manually using the appropriatesystemctl or service command. As the message indicates, non-root users can’trun Docker commands by default.

Upgrade Docker after using the convenience script

If you installed Docker using the convenience script, you should upgrade Dockerusing your package manager directly. There is no advantage to re-running theconvenience script, and it can cause issues if it attempts to re-addrepositories which have already been added to the host machine.

Uninstall Docker Engine - Community

  1. Uninstall the Docker Engine - Community package:

  2. Images, containers, volumes, or customized configuration files on your hostare not automatically removed. To delete all images, containers, andvolumes:

Install Docker Ubuntu 18.04

You must delete any edited configuration files manually.

Install Docker Ubuntu 17.10

Next steps

Install Docker Ubuntu 16.04

  • Continue to Post-installation steps for Linux

  • Continue with the User Guide.

Install Docker Ubuntu Vm For Virtualbox

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