Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753114AbcCKWbx (ORCPT ); Fri, 11 Mar 2016 17:31:53 -0500 Received: from mail-vk0-f43.google.com ([209.85.213.43]:34749 "EHLO mail-vk0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752840AbcCKWbv (ORCPT ); Fri, 11 Mar 2016 17:31:51 -0500 MIME-Version: 1.0 X-Originating-IP: [196.210.30.63] In-Reply-To: <20160311222401.GV17997@ZenIV.linux.org.uk> References: <56E327FF.1010103@nod.at> <56E3298A.1040008@nod.at> <56E32CD3.1010705@gmail.com> <20160311215106.GU17997@ZenIV.linux.org.uk> <20160311222401.GV17997@ZenIV.linux.org.uk> Date: Sat, 12 Mar 2016 00:31:50 +0200 Message-ID: Subject: Re: Variant symlink filesystem From: Cole To: Al Viro Cc: LKML , "Austin S. Hemmelgarn" , Richard Weinberger Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2019 Lines: 42 On 12 March 2016 at 00:24, Al Viro wrote: > On Sat, Mar 12, 2016 at 12:03:11AM +0200, Cole wrote: > >> This was one of the first solutions we looked at, and using various >> namespaces. However we would like to be able to have multiple terminal >> sessions open, and be able to have each session using a different >> mount point, or be able to use the other terminals mount point, i.e. >> switching the mount point to that of the other terminals. We would >> also like the shell to be able to make use of these, and use shell >> commands such as 'ls'. >> >> When we originally looked at namespaces and containers, we could not >> find a solution to achieve the above. Is this possible using >> namespaces? > > I'd try to look at setns(2) if you want processes joinging existing namespaces. > I'm afraid that I'll need to get some sleep before I'll be up to asking > the right questions for figuring out what requirements do you have and > what's the best way to do it - after a while coffee stops being efficient > and I'm already several hours past that ;-/ Sure, not a problem, when you have time to reply I will gladly welcome any feed back. As for the usage, I'll explain it a bit so that you have something to work off of when you get a chance to read it. The problem we encountered with namespaces when we looked at it more than a year ago was 'how do you get the shell' to join them, or into one. And also how do you move the shell in one terminal session into a namespace that another shell is currently in. We wanted a solution that doesn't require modifying existing programs to make them namespace aware. However, as I said, this was more than a year ago that we looked at it, and we could easily have misunderstood something, or not understood the full functionality available. If you say this is possible, without modifying programs such as bash, could you please point me in the direction of the documentation describing this, and I will try to educate myself. Thanks /Cole