How to Install and Configure Docker on Alibaba Cloud ECS Instance

Docker is an open-source platform from the Moby Project that helps package applications into containers and automate the deployment. You can deliver the application quickly since you can separate your applications from your infrastructure.

Docker offers two versions: Docker Community Edition (CE) and Docker Enterprise Edition (EE). Docker CE is available in the Docker Store and can run on Debian, macOS, CentOS, Windows 10, and cloud platforms. Docker EE is the premium version of Docker CE for enterprises.

Prerequisites

In this article, we suppose that you already possess an Alibaba Cloud ECS instance with the following latest image available when writing this article:

Installing Docker

We will show you how you can install Docker on the previous images listed above.

Installing on Debian 9.9 and Ubuntu 20.04

First, update the cache of the server:
$ sudo apt update

Set up the repository over HTTPS:
$ sudo apt install ca-certificates curl gnupg lsb-release

Add the official Docker GPG key:
$ curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg –dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg

Set the stable repository of Docker:

$ echo “deb [arch=$(dpkg –print-architecture) 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

$ echo “deb [arch=$(dpkg –print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian
$(lsb_release -cs) stable” | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

Update the cache again:
$ sudo apt update

Now, you can install Docker Engine:
$ sudo apt-get install docker-ce docker-ce-cli containerd.io

You can check if the service is running by running the following command:
$ sudo systemctl status docker

Add the default user to the docker group so that will not need to use the `sudo` command with docker:
$ sudo usermod -aG docker franck

Installing on Centos 8.5

Install the `yum-utils` package to have the `yum-config-manager`:
$ sudo yum install -y yum-utils

Install the docker stable repository with the `yum-config-manager` utility:
$ sudo yum-config-manager –add-repo https://download.docker.com/linux/centos/docker-ce.repo

Install docker-engine:
$ sudo yum install docker-ce docker-ce-cli containerd.io

Start the docker service:
$ sudo systemctl start docker

Check if the service has started properly:
$ sudo systemctl status docker

Add your user to the docker group:
$ sudo usermod -aG docker franck

Installing on Alibaba Cloud Linux 3

Add the DNF repository of Docker-CE:
$ sudo dnf config-manager –add-repo=https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

Install the Docker-CE package:
$ sudo dnf -y install docker-ce –nobest

Make sure to start the docker service:
$ sudo systemctl start docker

Don’t forget to add your Linux user to the docker group:
$ sudo usermod -aG docker franck

Note: When you install docker without adding your user to the docker group, you will need to use the `sudo` command to run any docker command every time. That is why in all steps, we remember you to add your user to the docker group.

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