Install Docker (with Docker Compose) on Ubuntu

install_docker.sh

#!/bin/bash

# Run the following command to uninstall all conflicting packages:
for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done

# Add Docker's official GPG key:
sudo apt-get update
sudo apt-get install ca-certificates curl gnupg
sudo install -m 0755 -d /etc/apt/keyrings
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
sudo chmod a+r /etc/apt/keyrings/docker.gpg

# Add the repository to Apt sources:
echo \
  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

# To install the latest version, run:
sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

echo 'Docker successfully installed.'

Use this script to install Docker on Ubuntu

1. Download script

wget https://gist.githubusercontent.com/welel/f80c96482e3b539487b9fa08bfcab86d/raw/90bc2330924d225aef7dc3178f5926bda7daff04/install_docker.sh

2. Give permissions

sudo chmod +x install_docker.sh

3. Start the script

sudo ./install_docker.sh

Understanding the Script

Here's a breakdown of what the script does:

1. The script starts by removing any old Docker packages that might conflict with the new installation.
2. It then installs necessary prerequisites like ca-certificates, curl, and gnupg to ensure secure communication with Docker’s repositories.
3. The Docker GPG key is added for security purposes, ensuring that all downloaded packages are verified and trusted.
4. The official Docker repository is added to your system's list of sources, which guarantees that you get the latest official Docker packages.
5. After updating your package index, the script installs the Docker engine (docker-ce), the command-line interface (docker-ce-cli), the container runtime (containerd.io), and the latest plugins for buildx and compose.
6. Finally, the script prints a success message.

Script Source

https://docs.docker.com/engine/install/ubuntu/