Docker container can't connect to internet

[ericsagnes]

Basic info

To make sure that we are on the same page:

• Kernel: Linux alpha 4.4.4 #1-NixOS SMP Thu Mar 3 23:10:04 UTC 2016 x86_64 GNU/Linux
• System: 16.09pre78286.0bf8a1a (Emu)
• Nix version: nix-env (Nix) 1.11.2
• Nixpkgs version: 16.09pre78286.0bf8a1a

Describe your issue here

Docker containers can't connect to internet.

$ ping google.com -c1
PING google.com (216.58.220.206) 56(84) bytes of data.
64 bytes from nrt13s36-in-f14.1e100.net (216.58.220.206): icmp_seq=1 ttl=49 time=55.2 ms

$ docker run -ti ubuntu ping google.com -c1
ping: unknown host google.com

It seems it has something to do with the DNS used by docker. (8.8.8.8 and 8.8.4.4)

Step to reproduce

1. enable docker in configuration.nix

   virtualisation.docker.enable = true;
   

2. run ping from a container

   $ docker run -ti ubuntu ping google.com -c1
   

cc docker maintainers @offlinehacker @tailhook

[jgillich]

Probably a duplicate of #11478; TLDR: systemctl restart docker.

[ericsagnes]

@jgillich Thanks!
Setting virtualisation.docker.socketActivation = false; and restarting docker unit solved the problem.

[stevenroose]

What's the fix for this now that socketActivation doesn't exist anymore?