How To Install Docker on Ubuntu 18.04

Oct 29, 2020

Introduction

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.

In this article, you’ll learn how to install and use it on an existing installation of Ubuntu 18.04.

Note: Docker requires a 64-bit version of Ubuntu as well as a kernel version equal to or greater than 3.10. The default 64-bit Ubuntu 18.04 server meets these requirements.

Installing Docker

Note: All the commands in this tutorial should be run as a non-root user. If root access is required for the command, it will be preceded by sudo. If avaoid the repeart sudo command use sudo -s command for access the root user.

Step 1: Access On Root User

sudo -s

Step 2: 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.

sudo apt-get update

Step 3: Uninstall Old Versions of Docker

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

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

Step 4: Install Docker on Ubuntu 18.04

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

sudo apt install docker.io

Step 5: Start and Automate Docker

The Docker service needs to be setup to run at startup. For start a docker:

sudo systemctl start docker

For enable a docker:

sudo systemctl enable docker

Step 6(Optional): Check Docker Version

To verify the installed Docker version number, enter:

docker --version