# Install Docker-ce

How do I install Docker CE on Debian 11/10?, How can I install Docker Compose on Debian 11/10 Linux system?. In this guide, I'll discuss a step by step installation of Docker and Docker Compose on Debian 11/10.

Docker is the most popular and widely used container runtime. It enables you to package and run your applications in isolated containers in a single server or cluster of Linux servers orchestrated by Kubernetes and similar tools.

## Docker Editions

There are two editions of Docker available.

-   **Community Edition (CE)**: ideal for individual developers and small teams looking to get started with Docker and experimenting with container-based apps.
-   **Enterprise Edition (EE)**: Designed for enterprise development and IT teams who build, ship, and run business-critical applications in production at scale.

This guide will cover installation of Docker CE on Debian 10 / Debian 11 Linux. But let's first look at common docker terminologies.

## Docker Components / Terminologies

Below are commonly used terminologies in Docker ecosystem.

-   **Docker daemon**: This is also called Docker Engine, it is a background process which runs on the host system responsible for building and running of containers.
-   **Docker Client**: This is a command line tool used by the user to interact with the Docker daemon.
-   **Docker Image**: An image is an immutable file that's essentially a snapshot of a container. A docker image has a file system and application dependencies required for running applications.
-   **Docker container**: This is a running instance of a docker image with an application and its dependencies. Each container has a unique process ID and isolated from other containers. The only thing containers share is the Kernel.
-   **Docker registry**: This is an application responsible for managing storage and delivery of Docker container images. It can be private or public.

# Install Docker CE on Debian 11 (Bullseye) / Debian 10 (Buster)

Follow the steps covered in the next parts of this article to install and use Docker CE on Debian 11/10.

## Step 1: Install Dependency packages

Start the installation by ensuring that all the packages used by docker as dependencies are installed.

```
sudo apt update
sudo apt -y install apt-transport-https ca-certificates curl gnupg2 software-properties-common
```

## Step 2: Add Docker's official GPG key:

Import Docker GPG key used for signing Docker packages.

```
curl -fsSL https://download.docker.com/linux/debian/gpg | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/docker-archive-keyring.gpg
```

## Step 3: Add the Docker repository to Debian 10 / Debian 11

Add Docker repository which contain the latest stable releases of Docker CE.

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

This command will add the line shown in `/etc/apt/sources.list` file.

## Step 4: Install Docker & Docker Compose on Debian 11/10

Update the `apt` package index.

```
sudo apt update
```

To install Docker CE on Debian, run the command:

```
sudo apt install docker-ce docker-ce-cli containerd.io -y
```

Start and enable docker service:

```
sudo systemctl enable --now docker
```

This installation will add `docker` group to the system without any users. Add your user account to the group to run docker commands as non-privileged user.

```
sudo usermod -aG docker $USER
newgrp docker
```

Check docker and compose version.

```
$ docker version
Client: Docker Engine - Community
 Version:           20.10.17
 API version:       1.41
 Go version:        go1.17.11
 Git commit:        100c701
 Built:             Mon Jun  6 23:03:17 2022
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.17
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.17.11
  Git commit:       a89b842
  Built:            Mon Jun  6 23:01:23 2022
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.6
  GitCommit:        10c12954828e7c7c9b6e0ea9b0c02b01407d3ae1
 runc:
  Version:          1.1.2
  GitCommit:        v1.1.2-0-ga916309
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0
```

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

```
exit
```

### Install Docker Compose on Debian

Use the guide below to install latest Docker Compose on Debian 10 / Debian 11

-   [How To Install Latest Docker Compose on Linux](https://computingforgeeks.com/how-to-install-latest-docker-compose-on-linux/)

## Step 5: Test Docker installation

Run a test docker container:

```
$ docker run --rm -it  --name test alpine:latest /bin/sh
latest: Pulling from library/alpine
2408cc74d12b: Pull complete
Digest: sha256:686d8c9dfa6f3ccfc8230bc3178d23f84eeaf7e457f36f271ab1acc53015037c
Status: Downloaded newer image for alpine:latest

 / # cat /etc/os-release
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.16.0
PRETTY_NAME="Alpine Linux v3.16"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://gitlab.alpinelinux.org/alpine/aports/-/issues"

 / # exit
```

## Step 6: Test Docker Compose installation.

Create a test Docker Compose file.

```
vim docker-compose.yml
```

Add below data to the file.

```
version: '3'
services:
  web:
    image: nginx:latest
    ports:
     - "8080:80"
    links:
     - php
  php:
    image: php:7-fpm
```

Start service containers.

```
$ docker-compose up -d
```

Output:

![docker compose start containers](https://computingforgeeks.com/wp-content/uploads/2019/03/docker-compose-start-containers.png?ezimgfmt=rs:696x404/rscb23/ng:webp/ngcb23)

Show running Containers

```
$ docker-compose ps
```

Destroy containers

```
$ docker-compose stop
$ docker-compose rm
Going to remove vagrant_web_1, vagrant_php_1
Are you sure? [yN] y
Removing vagrant_web_1 ... done
Removing vagrant_php_1 ... done
```

You have successfully installed Docker on Debian 10 / Debian 11 Linux. Go through Official[ Docker documentation](https://docs.docker.com/) and [Docker Compose documentation](https://docs.docker.com/compose/) to learn more.

## Setup Docker UI (Optional)

If you need a UI management console for Docker hosts and containers, checkout Portainer.

-   [How to Install Portainer Docker UI manager](https://computingforgeeks.com/install-docker-ui-manager-portainer/)

## Monitoring Docker containers

Monitoring Docker containers can be achieved by using Monitoring tools such as [Netdata, Prometheus and Grafana](https://computingforgeeks.com/category/monitoring/). Below guide should also be helpful [Check Container container metrics with Ctop.](https://computingforgeeks.com/top-command-for-container-metrics/)

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