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Installing Docker on Ubuntu 22.04 ​

This guide will walk you through the steps to install Docker on an Ubuntu 22.04 server, including setting up the firewall and OpenSSL.

Step 1: Update and Upgrade the System ​

First, update and upgrade your system packages to ensure you have the latest versions.

bash
sudo apt update && sudo apt upgrade -y

Step 2: Install Required Packages ​

Install the necessary packages for Docker and OpenSSL.

bash
sudo apt install apt-transport-https ca-certificates curl software-properties-common -y
sudo apt install openssl -y

Step 3: Add Docker’s Official GPG Key ​

Add Docker's official GPG key to your system.

bash
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

Step 4: Set Up the Docker Repository ​

Add the Docker repository to APT sources.

bash
echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Step 5: Install Docker ​

Update the package database with the Docker packages from the newly added repo and install Docker.

bash
sudo apt update
sudo apt install docker-ce -y

Step 6: Verify Docker Installation ​

Check the Docker version to verify the installation.

bash
docker --version

Step 7: Start and Enable Docker ​

bash
sudo systemctl status docker

Step 7: Manage Docker as a Non-root User ​

Add your user to the docker group to manage Docker as a non-root user.

bash
sudo usermod -aG docker ${USER}

Log out and log back in so that the group membership is re-evaluated.

Step 8: Set Up the Firewall ​

Install ufw (Uncomplicated Firewall) and allow necessary ports.

bash
sudo apt install ufw -y
sudo ufw allow OpenSSH
sudo ufw enable

To allow Docker to manage its own firewall rules, disable ufw's interaction with Docker.

bash
sudo nano /etc/ufw/ufw.conf

Set MANAGE_BUILTINS=no in the configuration file.

Step 9: Install OpenSSL ​

OpenSSL should already be installed from Step 2, but you can verify it with:

bash
openssl version

Conclusion ​

You have successfully installed Docker on your Ubuntu 22.04 server, set up the firewall, and installed OpenSSL. You can now start using Docker to manage your containers.