dockerd not running on nixos

Question

I installed docker on nixos, using:

nix-env -i docker

after that, dockerd was not running, so I started the daemon manually with:

dockerd

and in the logs, I see:

WARN[2019-06-26T01:02:31.784701442Z] could not change group /var/run/docker.sock to docker: group docker not found

should I care about this warning?

Salade

Answer 1

When installing docker on NixOS, it's best to enable it in the NixOS configuration. Doing so will install docker as a system service.

Snippet for /etc/nixos/configuration.nix:

virtualisation.docker.enable = true;

# ...

users.users.YOU = { # merge this with your unix user definition, "YOU" is for illustration
  isNormalUser = true;
  # ...
  extraGroups = [
    # ...
    "docker"
  ];
};

Mt

I am pretty sure (but less than 100%) you will need to create the docker group as well. – Alderete

The docker module creates the group for you: github.com/NixOS/nixpkgs/blob/… – Mt

even when I add extraGroups if I run groups on a terminal after restarting (and running nixos-rebuild switch) the docker group is not listed under my user – Dede

Answer 2

created a group docker. Docker needs that user group to start as a service.

Gurgitation

Answer 3

Make sure to restart your computer, and not just logout-login, to actually make sudo-less docker work.

Inwrap