On 16.04, neither lxc nor lxd containers with 14.04 run docker

[Marcos Diez]

On a Ubuntu 16.04 server amd64 host, docker does not work inside of a (lxc or lxd) Ubuntu 14.04 guest.

I tested on both a clean Ubuntu 16.04 install and also one that was upgraded from Ubuntu 15.10.

My definition of work is having the expected result when running

---------------------------
   sudo docker run hello-world
---------------------------

If the guest containers is also Ubuntu 16.04, it works out of the box.

The images were made either using

lxc-create -t download -n test01 -- -d ubuntu -r trusty -a amd64

or on lxd following the syntax from https://www.stgraber.org/2016/03/11/lxd-2-0-introduction-to-lxd-112/

Just for further reference, If the host is 15.10, one can have docker inside of LXC containers if one does the following:

a) on the host:
   add this to /etc/lxc/default.conf

lxc.aa_profile = unconfined
lxc.cgroup.devices.allow = a
lxc.cap.drop =

   sudo mv /usr/share/lxc/config/common.conf.d/00-lxcfs.conf /usr/share/lxc/config/common.conf.d/00-lxcfs.conf.disabled
   iptables -L # really. this loads modules that the docker install needs to be happy
   ip6tables -L # really. this loads modules that the docker install needs to be happy

create the guest with something like

lxc-create -t download -n test01 -- -d ubuntu -r trusty -a amd64

b) on the guest

   sudo apt-get install curl apparmor cgroup-lite

   curl -fsSL https://get.docker.com/ | sudo sh # the docker from apt-get install docker.io does not work,

   sudo docker run hello-world

I personally consider this bug very important because 15.10 will be unsupported in July, so not upgrading will become an insecure choice to make.

If there is any way I can help you, please let me know.

Thanks

Marcos

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lxd 2.0.0-0ubuntu4
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
Date: Tue Apr 26 00:37:03 2016
InstallationDate: Installed on 2016-02-18 (67 days ago)
InstallationMedia: Ubuntu-Server 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: lxd
UpgradeStatus: Upgraded to xenial on 2016-04-21 (4 days ago)

[Serge Hallyn (serge-hallyn)]

This is not a lxd bug. You need the docker source as is packaged in
16.04. To run that in a 14.04 container, you might be able to build
the 16.04 package in a ppa for 14.04, but I've not tried it. Marking
this as affecting docker.io

 status invalid
 affects docker.io

[Marcos Diez (bugshideout)]

Thanks!

Since somehow this bug is not showing up on the docker.io team, I opened it again.

the link is here for future reference
https://bugs.launchpad.net/ubuntu/+source/docker.io/+bug/1575169