Confined Docker snap available

[Loïc Minier]

Hi!

Docker is since some days available as a properly confined snap. This will
work on top of classic Ubuntu 16.04+ or on top of an up-to-date Ubuntu Core
series 16.

Because the docker.sock path is hardcoded in a lot of images, this snap
conflicts with docker debs, so make sure you remove them first:
sudo apt purge docker docker-engine

Create a system group for docker:
sudo groupadd --system docker

Install the snap:
sudo snap install docker

And connect the interfaces (these will go away we have a snap-declaration
in place):
sudo snap connect docker:docker-cli docker:docker-daemon
sudo snap connect docker:firewall-control ubuntu-core:firewall-control
sudo snap connect docker:support ubuntu-core:docker-support
sudo service snap.docker.dockerd stop
sudo service snap.docker.dockerd start

You're now ready to use docker, e.g.:
sudo /snap/bin/docker run --rm -it hello-world
sudo /snap/bin/docker run --rm -it ubuntu

At the moment, the Docker snap is available for amd64, armhf, arm64, i386.

Docker-compose is also included, and may be used with the "docker.compose"
command.

Want to read more about docker? Read the Docker snap status and FAQ doc
<https://docs.google.com/document/d/1JHa6tkuR9PtpnAVVmAJIAKuyKBy8E9ZkvG5Wbc6HZSY/edit?usp=sharing>
!

Have fun and please report issues against
https://github.com/docker-snap/docker

Cheers,
- Loïc Minier
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