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 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’ll want to use Docker CE.
In this tutorial, we will cover how to install Docker on Ubuntu 18.04 .
- 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)
Install Docker on Ubuntu Using Default Repositories
Step 1: Update Software Repositories
As usual, it’s a good idea to update the local database of software to make sure you’ve got access to the latest revisions.
Therefore, 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: