Failed to connect to bus: No such file or directory on systemd operations

[vonpupp]

Hello,

I am having problems to use systemd, I suspect is related to dbus.

Here is my Vagrantfile:

Vagrant.configure("2") do |config|
  ENV['VAGRANT_DEFAULT_PROVIDER'] = 'docker'
  config.vm.provider "docker" do |d|
    d.image = "tknerr/baseimage-ubuntu:16.04"
    d.has_ssh = true
    d.create_args = [ "--privileged", "-v", "/sys/fs/cgroup:/sys/fs/cgroup:ro" ]
  end
  config.vm.synced_folder ".", "/vagrant"
end

When I ssh to the box I try to list the units of systemd and I get the following error:

$ vagrant ssh
Last login: Tue Jan 17 13:13:15 2017 from 172.17.0.1
vagrant@d6fa0552baf5:~$ sudo su
root@d6fa0552baf5:/home/vagrant# systemctl list-units
Failed to connect to bus: No such file or directory

Have you seen this issue? Any idea?

Thanks.

[tknerr]

Hi @vonpupp , sorry for the delay.

What you are seeing is actually expected. The entrypoint for the docker images in this repository is actually sshd, i.e. this is the only process that is being started when you run the container.

E.g. running ps aux inside the container you see that these are the only processes that are running:

vagrant@linus-kitchen:~$ ps aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.0   4448   740 ?        Ss   21:21   0:00 /bin/sh -c /usr/sbin/sshd -D     -o UseDNS=no    -o UsePAM=no    -o PasswordAuthentication=yes    -o UsePrivilegeSeparation=no    -o PidFile=/t
root         7  0.0  0.2  61384  5008 ?        S    21:21   0:00 /usr/sbin/sshd -D -o UseDNS=no -o UsePAM=no -o PasswordAuthentication=yes -o UsePrivilegeSeparation=no -o PidFile=/tmp/sshd.pid
root      9642  0.0  0.2  61740  5748 ?        Ss   21:32   0:00 sshd: vagrant@pts/0
vagrant   9643  0.0  0.1  19764  3476 pts/0    Ss   21:32   0:00 -bash
vagrant   9660  0.0  0.1  17140  2256 pts/0    R+   21:33   0:00 ps aux

Especially there is no init system like systemd running, so systemctl isn't usable here.

More info about it here:
http://phusion.github.io/baseimage-docker/

As a possible solution for your case, you could:

• try the phusion / baseimage boxes, but they ship with runit instead of systemd afaik: https://github.com/phusion/baseimage-docker
• try one of these for systemd in docker:
  • https://github.com/solita/docker-systemd
  • https://github.com/dockerimages/docker-systemd

HTH to get you a bit further