netdev - Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

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Date:	Thu, 25 Feb 2010 14:31:11 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Daniel Lezcano <daniel.lezcano@...e.fr>
Cc:	hadi@...erus.ca, Linux Netdev List <netdev@...r.kernel.org>,
	containers@...ts.linux-foundation.org,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>,
	Ben Greear <greearb@...delatech.com>,
	Daniel Lezcano <dlezcano@...ibm.com>
Subject: Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

Daniel Lezcano <daniel.lezcano@...e.fr> writes:

>> No, the plan is only one namespace at a time.
>>
>> It would not be much of a change to support multiple namespaces,
>> but I don't think I want to go there.  Bitmaps filling up are
>> ugly and I don't see what would be gained.
>>   
> The idea I had in mind when I asked this question was if we can "move" a process
> inside a container, aka a set of namespaces :)

Yes.

>> I does make sense to support all of the namespaces we can support
>> with unshare, but with nstype as an enumeration not as a bitmap.
>>   
> I suppose when you say "to support all of the namespaces we can support with
> *unshare*", you exclude the pid namespace which is created only with clone,
> right ? Do you think we can extend the concept to all the namespaces including
> the pid_namespace ?

Yes, and I think also the credential/uid namespace.

It is possible that this could be the basis for a general purpose
enter, but that is not the primary motivation.  I am after the
easy cases simple cases.  So I can modify /sbin/ip to take advantage
of it.

Eric

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