Run docker on Raspberry Pi
A docker container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another.
A Docker container image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings.
Comparing Containers and Virtual Machines
Containers and virtual machines have similar resource isolation and allocation benefits, but function differently because containers virtualize the operating system instead of hardware. Containers are more portable and efficient.
Install docker on Raspberry Pi
Docker official add support to install Docker on Raspberry Pi since raspbian/jessie .
To install docker on Raspberry Pi in a single shell command:
$ curl -sSL https://get.docker.com | sh # Executing docker install script, commit: 442e66405c304fa92af8aadaa1d9b31bf4b0ad94 + sudo -E sh -c apt-get update -qq >/dev/null + sudo -E sh -c DEBIAN_FRONTEND=noninteractive apt-get install -y -qq apt-transport-https ca-certificates curl >/dev/null + sudo -E sh -c curl -fsSL "https://download.docker.com/linux/raspbian/gpg" | apt-key add -qq - >/dev/null Warning: apt-key output should not be parsed (stdout is not a terminal) + sudo -E sh -c echo "deb [arch=armhf] https://download.docker.com/linux/raspbian buster stable" > /etc/apt/sources.list.d/docker.list + sudo -E sh -c apt-get update -qq >/dev/null + [ -n ] + sudo -E sh -c apt-get install -y -qq --no-install-recommends docker-ce >/dev/null + sudo -E sh -c docker version Client: Docker Engine - Community Version: 19.03.8 API version: 1.40 Go version: go1.12.17 Git commit: afacb8b Built: Wed Mar 11 01:35:24 2020 OS/Arch: linux/arm Experimental: false Server: Docker Engine - Community Engine: Version: 19.03.8 API version: 1.40 (minimum version 1.12) Go version: go1.12.17 Git commit: afacb8b Built: Wed Mar 11 01:29:22 2020 OS/Arch: linux/arm Experimental: false containerd: Version: 1.2.13 GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429 runc: Version: 1.0.0-rc10 GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd docker-init: Version: 0.18.0 GitCommit: fec3683 If you would like to use Docker as a non-root user, you should now consider adding your user to the "docker" group with something like: sudo usermod -aG docker pi Remember that you will have to log out and back in for this to take effect! WARNING: Adding a user to the "docker" group will grant the ability to run containers which can be used to obtain root privileges on the docker host. Refer to https://docs.docker.com/engine/security/security/#docker-daemon-attack-surface for more information.
Run docker, you need use
sudo by default:
$ sudo docker run -it --rm alpine
If you donot use
sudo, you will get permission denied error:
$ docker run -it --rm alpine docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.40/containers/create: dial unix /var/run/docker.sock: connect: permission denied. See 'docker run --help'.
To solve this issue, add current user to docker group:
$ sudo usermod -aG docker pi
Logout and re-login
pi to let
pi use docker without
$ docker run -it --rm alpine / # uname -a Linux d551a4afa4e1 4.19.97-v7+ #1294 SMP Thu Jan 30 13:15:58 GMT 2020 armv7l Linux
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