How to install Docker on your own server

In this manual we will show you how to install and configure Docker on your own server. By following these simple steps you will be able to have Docker installed and fully functional in just a few minutes, allowing you to launch containers or "compose" multi-container architectures.

Prerequisites

This manual covers the installation of Docker for the Ubuntu 18.04 distribution. The procedure will be very similar for later versions of Ubuntu and even for any Debian-based distribution. However, the steps detailed below will not work for distributions such as Red Hat, Fedora, CentOS, etc.

• Ubuntu 18.04 (or compatible)
• Root access
• SSH connection or terminal

All commands in this manual assume that they are executed with root permissions. Depending on the configuration of each system, it may be necessary to precede them with sudo.

Installing the repositories

First, we will proceed to install the repositories, as well as the necessary dependencies.

1. Update the package list

apt-get update

2. We ensure that we can establish connection with repositories through the HTTPS protocol

apt-get install apt-transport-https ca-certificates curl software-properties-common

The above command will install the necessary dependencies to be able to add and work correctly with a repository through a secure connection.

3. We download and add the public key of the Docker repository

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

This key will allow us to verify the integrity of the files and the authenticity of the sender, thus avoiding any kind of packet / file spoofing. This is a standard and common security measure.

4. Add the repository and update the package list

add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"

info Note that the previous command includes the release name of the distribution. In this case, bionic. In case this manual is used in other versions of Ubuntu or distributions derived from Ubuntu, it will be necessary to change this word to ensure compatibility.

apt-get update

Finally, we will update the list of packages, thus enabling the repository.

5. Install Docker using the package manager

apt-get install docker-ce

The package name docker-ce refers to the free ("community edition") version of Docker.

6. We test the installation by launching the container "hello-world "

docker container run hello-world

success You are done! If you have followed all the steps correctly, you have successfully installed Docker on your Ubuntu server.