Install Docker on Ubuntu

Docker is an increasingly popular software package that creates a container for application development.

Developing in Docker speeds up applications, as it shares the kernel and other resources, instead of requiring dedicated server resources.

There are two versions of Docker – Docker CE (Community Edition) and Docker EE (Enterprise Edition). If you have a small-scale project, or you’re just learning, you will want to use Docker CE.

In this tutorial, we will show you how to install Docker on Ubuntu 18.04.

Prerequisites

• Ubuntu 18.04 64-bit operating system
• A user account with sudo privileges
• Command-line/terminal (CTRL-ALT-T or Applications menu > Accessories > Terminal)
• Docker software repositories (optional)

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Install Docker on Ubuntu Using Default Repositories

Step 1: Update Software Repositories

It’s a good idea to update the local database of software to make sure you’ve got access to the latest revisions.

Open a terminal window and type:

sudo apt-get update

Allow the operation to complete.

Step 2: Uninstall Old Versions of Docker

Next, it’s recommended to uninstall any old Docker software before proceeding.

Use the command:

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

Step 3: Install Docker

To install Docker on Ubuntu, in the terminal window enter the command:

sudo apt install docker.io

Step 4: Start and Automate Docker

The Docker service needs to be setup to run at startup. To do so, type in each command followed by enter:

sudo systemctl start docker

sudo systemctl enable docker

Step 5 (Optional): Check Docker Version

To verify the installed Docker version number, enter:

docker --version