[Users] Docker inside OVZ 7 containers

[jjs - mainphrame]

Thanks for the guidelines - I see some encouraging initial results
with docker inside a centos 7 CT:

[root at vz105 ~]# docker run hello-world
Unable to find image 'hello-world:latest' locally
Trying to pull repository docker.io/library/hello-world ... latest:
Pulling from library/hello-world

79112a2b2613: Pull complete
4c4abd6d4278: Pull complete
Digest: sha256:4f32210e234b4ad5cac92efacc0a3d602b02476c754f13d517e1ada048e5a8ba
Status: Downloaded newer image for docker.io/hello-world:latest


Hello from Docker.
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker Hub account:
 https://hub.docker.com

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/

[root at vz105 ~]#

On Fri, May 27, 2016 at 1:41 AM, Konstantin Khorenko
<khorenko at virtuozzo.com> wrote:
> Hi Jake,
>
> when trying Docker Containers inside Virtuozzo 7 Containers, please make
> sure you have
> kernel 3.10.0-327.18.2.vz7.14.7 or later.
>
> And if there are any issues with Docker application template, please let us
> know,
> but in fact it's enough to:
> * load "veth", "overlay" kernel modules on the host
> * enable full netfilters for the VZ 7 CT (to be run on a stopped Container):
>   # prlctl set $CTID --netfilter=full
>
> And after that install and use Docker inside a VZ7 CT like it's done on any
> full OS without Docker application template installation.
>
> --
> Best regards,
>
> Konstantin Khorenko,
> Virtuozzo Linux Kernel Team
>
>
> On 05/27/2016 08:02 AM, jjs - mainphrame wrote:
>>
>> Thanks Denis,
>>
>> I'll check this out very soon -
>>
>> Jake
>>
>> On Thu, May 26, 2016 at 8:00 AM, Denis Silakov <dsilakov at virtuozzo.com>
>> wrote:
>>>
>>> You can try to create container from centos-7-x86_64 template and then
>>> install docker app template there:
>>>
>>> # vzctl create 111 --ostemplate centos-7-x86_64
>>> # vzctl start 111
>>> # vzpkg install 111 docker
>>>
>>> It can require some preparations though; pre-install script checks them
>>> and
>>> refuses to proceed if anything is wrong. Currently it checks that
>>> "bridge:on" feature is set and netfilter is set to "full"
>>>
>>> (https://src.openvz.org/projects/OVZT/repos/centos-7-x86_64-ez/browse/docker_pre-install-hn#42).
>>>
>>>
>>> On 05/25/2016 03:27 AM, jjs - mainphrame wrote:
>>>>
>>>>
>>>> Greetings,
>>>>
>>>> Just a quick question - I've been reading that it's possible to spin
>>>> up docker apps inside OVZ 7 containers - are there any particular
>>>> preparations or workarounds required, in the way of differences from a
>>>> docker install on a full OS?
>>>>
>>>> Disclaimer - I haven't done anything with docker, but I'm curious to
>>>> see how useful it might be, and in particular, how well it works
>>>> inside a Linux container.
>>>>
>>>> Jake
>
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