Cockpit as a privileged container?

Daniel J Walsh dwalsh at redhat.com
Mon Aug 4 19:34:11 UTC 2014


On 08/01/2014 09:45 AM, Trevor Jay wrote:
> On Fri, Aug 01, 2014 at 06:26:03AM -0400, Daniel J Walsh wrote:
>> We have kicked around the idea of a "Super Priv container" where you
>> could switch to a limited number of namespaces.  
>>
> If the number of namespaces we want to support switching to is limited and --privileged containers run with a different type (docker_t) from others (svirt_lxc_net_t), do you really need upstream Docker support? Terrible idea: couldn't we take the same approach we do with service and have an executable for each namespace we want? These "entry points" only purpose would be to provide a transition point from docker_t? Combined with:
>
>     -v /var/..:/host --net="host"
>
> such a container would only have to know to where to expect the mount point and the directory of "namespace entry points".
>
> Taking this approach, I was able to get a container with an unmunged network, access to the host /, and able to spawn processes running as unconfined_t. That (or less) seems sufficient for cockpit given a few modifications.
>
> Granted, real --namespace-add and --namespace-drop support would be less of a sin against god and man... but this would allow for experimentation right now.
>
> _Trevor
>
That looks good, except you don't have /proc shared.

This works for me on newer docker.

docker run --rm -v /:/host -ti --net=host --privileged fedora /bin/sh

I was thinking of doing this with /sysimage, but maybe /host is a better
name.





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