Debian
Docker is supported on the following versions of Debian:
- Debian testing stretch (64-bit)
- Debian 8.0 Jessie (64-bit)
- Debian 7.7 Wheezy (64-bit) (backports required)
Note: If you previously installed Docker using
APT
, make sure you update yourAPT
sources to the newAPT
repository.
Prerequisites
Docker requires a 64-bit installation regardless of your Debian version. Additionally, your kernel must be 3.10 at minimum. The latest 3.10 minor version or a newer maintained version are also acceptable.
Kernels older than 3.10 lack some of the features required to run Docker containers. These older versions are known to have bugs which cause data loss and frequently panic under certain conditions.
To check your current kernel version, open a terminal and use uname -r
to display your kernel version:
$ uname -r
Additionally, for users of Debian Wheezy, backports must be available. To enable backports in Wheezy:
Log into your machine and open a terminal with
sudo
orroot
privileges.-
Open the
/etc/apt/sources.list.d/backports.list
file in your favorite editor.If the file doesn’t exist, create it.
Remove any existing entries.
-
Add an entry for backports on Debian Wheezy.
An example entry:
deb http://http.debian.net/debian wheezy-backports main
-
Update package information:
$ apt-get update
Update your apt repository
Docker’s APT
repository contains Docker 1.7.1 and higher. To set APT
to use from the new repository:
If you haven’t already done so, log into your machine as a user with
sudo
orroot
privileges.Open a terminal window.
-
Purge any older repositories.
$ apt-get purge lxc-docker* $ apt-get purge docker.io*
-
Update package information, ensure that APT works with the
https
method, and that CA certificates are installed.$ apt-get update $ apt-get install apt-transport-https ca-certificates
-
Add the new
GPG
key.$ apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
-
Open the
/etc/apt/sources.list.d/docker.list
file in your favorite editor.If the file doesn’t exist, create it.
Remove any existing entries.
-
Add an entry for your Debian operating system.
The possible entries are:
-
On Debian Wheezy
deb https://apt.dockerproject.org/repo debian-wheezy main
-
On Debian Jessie
deb https://apt.dockerproject.org/repo debian-jessie main
-
On Debian Stretch/Sid
deb https://apt.dockerproject.org/repo debian-stretch main
Note: Docker does not provide packages for all architectures. To install docker on a multi-architecture system, add an
[arch=...]
clause to the entry. Refer to the Debian Multiarch wiki for details. -
Save and close the file.
-
Update the
APT
package index.$ apt-get update
-
Verify that
APT
is pulling from the right repository.$ apt-cache policy docker-engine
From now on when you run
apt-get upgrade
,APT
pulls from the new apt repository.
Install Docker
Before installing Docker, make sure you have set your APT
repository correctly as described in the prerequisites.
-
Update the
APT
package index.$ sudo apt-get update
-
Install Docker.
$ sudo apt-get install docker-engine
-
Start the
docker
daemon.$ sudo service docker start
-
Verify
docker
is installed correctly.$ sudo docker run hello-world
This command downloads a test image and runs it in a container. When the container runs, it prints an informational message. Then, it exits.
Giving non-root access
The docker
daemon always runs as the root
user and 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 so, by default, you can access it with sudo
.
If you (or your Docker installer) create a Unix group called docker
and add users to it, then the docker
daemon will make the ownership of the Unix socket read/writable by the docker
group when the daemon starts. The docker
daemon must always run as the root user, but if you run the docker
client as a user in the docker
group then you don’t need to add sudo
to all the client commands. From Docker 0.9.0 you can use the -G
flag to specify an alternative group.
Warning: The
docker
group (or the group specified with the-G
flag) isroot
-equivalent; see Docker Daemon Attack Surface details.
Example:
# Add the docker group if it doesn't already exist. $ sudo groupadd docker # Add the connected user "${USER}" to the docker group. # Change the user name to match your preferred user. # You may have to logout and log back in again for # this to take effect. $ sudo gpasswd -a ${USER} docker # Restart the Docker daemon. $ sudo service docker restart
Upgrade Docker
To install the latest version of Docker with apt-get
:
$ apt-get upgrade docker-engine
Uninstall
To uninstall the Docker package:
$ sudo apt-get purge docker-engine
To uninstall the Docker package and dependencies that are no longer needed:
$ sudo apt-get autoremove --purge docker-engine
The above commands will not remove images, containers, volumes, or user created configuration files on your host. If you wish to delete all images, containers, and volumes run the following command:
$ rm -rf /var/lib/docker
You must delete the user created configuration files manually.
What next?
Continue with the User Guide.
Please login to continue.