Get Docker CE for Debian

Install using the repository
Post-installation steps for Linux
Install Docker Compose
References

Install using the repository

Before you install Docker CE for the first time on a new host machine, you need to set up the Docker repository. Afterward, you can install and update Docker from the repository.

Set up the repository

Update the apt package index:
```
 $ sudo apt-get update
```

Install packages to allow apt to use a repository over HTTPS:

 $ sudo apt-get install \
     apt-transport-https \
     ca-certificates \
     curl \
     gnupg2 \
     software-properties-common

Add Docker’s official GPG key:

 curl -fsSL https://download.docker.com/linux/debian/gpg | sudo apt-key add -

Verify that the key ID is 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88.

 $ sudo apt-key fingerprint 0EBFCD88
 pub   rsa4096 2017-02-22 [SCEA]
       9DC8 5822 9FC7 DD38 854A  E2D8 8D81 803C 0EBF CD88
 uid           [ unknown] Docker Release (CE deb) <docker@docker.com>
 sub   rsa4096 2017-02-22 [S]

Use the following command to set up the stable repository.

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

Note: The lsb_release -cs sub-command below returns the name of your Debian distribution, such as stretch.

Install Docker CE

Update the apt package index.
```
 $ sudo apt-get update
```
Install the latest version of Docker CE, or go to the next step to install a specific version. Any existing installation of Docker is replaced.
```
 $ sudo apt-get install docker-ce
```
If you have multiple Docker repositories enabled, installing or updating without specifying a version in the apt-get install or apt-get update command will always install the highest possible version, which may not be appropriate for your stability needs.
On production systems, you should install a specific version of Docker CE instead of always using the latest. This output is truncated. List the available versions:
```
 $ apt-cache madison docker-ce
  docker-ce | 17.06.2~ce-0~debian | https://download.docker.com/linux/debian stretch/stable amd64 Packages
  docker-ce | 17.03.0~ce-0~debian-stretch | https://download.docker.com/linux/debian stretch/stable amd64 Packages
```
The contents of the list depend upon which repositories are enabled. Choose a specific version to install. The second column is the version string. The third column is the repository name, which indicates which repository the package is from and by extension its stability level. To install a specific version, append the version string to the package name and separate them by an equals sign (=):
```
 $ sudo apt-get install docker-ce=<VERSION_STRING>
```
The Docker daemon starts automatically.

Uninstall Docker CE

Uninstall the Docker CE package:
```
 sudo apt-get purge docker-ce
```
Images, containers, volumes, or customized configuration files on your host are not automatically removed. To delete all images, containers, and volumes:
```
 $ sudo rm -rf /var/lib/docker
```
You must delete any edited configuration files manually.

Post-installation steps for Linux

Manage Docker as a non-root user

The docker daemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user root and other users can only access it using sudo. The docker daemon always runs as the root user.

If you don’t want to use sudo when you use the docker command, create a Unix group called docker and add users to it. When the docker daemon starts, it makes the ownership of the Unix socket read/writable by the docker group.

Warning: The docker group grants privileges equivalent to the root user. For details on how this impacts security in your system, see Docker Daemon Attack Surface.

Configure Docker to start on boot

systemd

$ sudo systemctl enable docker

Installing Bash Command Completion for Core Docker Commands

# 1. Make sure bash completion is installed. 
$ yum install -y bash-completion
# 2. Install docker completion.
$ sudo curl -L https://raw.githubusercontent.com/docker/docker-ce/master/components/cli/contrib/completion/bash/docker -o /etc/bash_completion.d/docker
# 3. Make docker completion to be available.
$ sudo . /etc/profile

Install Docker Compose

On Linux, you can download the Docker Compose binary from the Compose repository release page on GitHub. Follow the instructions from the link, which involve running the curl command in your terminal to download the binaries. These step by step instructions are also included below.

Run this command to download Docker Compose, replacing $dockerComposeVersion with the specific version of Compose you want to use:

 sudo curl -L https://github.com/docker/compose/releases/download/$dockerComposeVersion/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose

For example, to download Compose version 1.15.0, the command is:

 sudo curl -L https://github.com/docker/compose/releases/download/1.15.0/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose

Use the latest Compose release number in the download command.

Apply executable permissions to the binary:

 sudo chmod +x /usr/local/bin/docker-compose

Install command completion for the bash shell

 sudo curl -L https://raw.githubusercontent.com/docker/compose/1.15.0/contrib/completion/bash/docker-compose -o /etc/bash_completion.d/docker-compose

Uninstallation

To uninstall Docker Compose if you installed using curl:
```
 sudo rm /usr/local/bin/docker-compose
```