Step-by-Step Guide to Installing Docker on Ubuntu

This guide explains how to install Docker Engine on an Ubuntu system, covering removal of previous Docker packages, repository configuration, installation of required components, verification of the installation, enabling Docker to start on boot, and optional image‑accelerator configuration.

1. Uninstall old Docker versions

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

2. Set up the Docker repository

$ sudo apt-get update

$ sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common

sudo add-apt-repository \
    "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
    $(lsb_release -cs) \
    stable"

3. Install Docker Engine

sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io

4. Test the installation

sudo docker run hello-world

5. Enable Docker to start on boot

sudo systemctl enable docker

6. Configure image acceleration (optional)

Visit the Alibaba Cloud container image acceleration service at https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors for further configuration.