This article explains how to install and configure Docker on the Alibaba Cloud ECS instance.
Docker is an open-source platform from the Moby Project that helps package the 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.
You can read the article on Containers and How to Choose Your Container Platform to also understand more about containers.
Pre-requisite
In this article, we suppose that you already possess an Alibaba Cloud ECS instance with the following latest image available when writing this article:
- Ubuntu 20.04
- Debian 9.9
- CentOs 8.5
- Alibaba Cloud Linux 3.2104 64-bits
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:
- On Ubuntu 20.04
$ 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
- On Debian 9.9
$ 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
Conclusion
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.
