Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752224AbbKPUqN (ORCPT ); Mon, 16 Nov 2015 15:46:13 -0500 Received: from h2.hallyn.com ([78.46.35.8]:46396 "EHLO h2.hallyn.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751068AbbKPUqK (ORCPT ); Mon, 16 Nov 2015 15:46:10 -0500 Date: Mon, 16 Nov 2015 14:46:06 -0600 From: "Serge E. Hallyn" To: Richard Weinberger Cc: "Serge E. Hallyn" , LKML , "open list:ABI/API" , Linux Containers , "Eric W. Biederman" , LXC development mailing-list , Tejun Heo , cgroups mailinglist , Andrew Morton Subject: Re: CGroup Namespaces (v4) Message-ID: <20151116204606.GA30681@mail.hallyn.com> References: <1447703505-29672-1-git-send-email-serge@hallyn.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1781 Lines: 45 On Mon, Nov 16, 2015 at 09:41:15PM +0100, Richard Weinberger wrote: > Serge, > > On Mon, Nov 16, 2015 at 8:51 PM, wrote: > > To summarize the semantics: > > > > 1. CLONE_NEWCGROUP re-uses 0x02000000, which was previously CLONE_STOPPED > > > > 2. unsharing a cgroup namespace makes all your current cgroups your new > > cgroup root. > > > > 3. /proc/pid/cgroup always shows cgroup paths relative to the reader's > > cgroup namespce root. A task outside of your cgroup looks like > > > > 8:memory:/../../.. > > > > 4. when a task mounts a cgroupfs, the cgroup which shows up as root depends > > on the mounting task's cgroup namespace. > > > > 5. setns to a cgroup namespace switches your cgroup namespace but not > > your cgroups. > > > > With this, using github.com/hallyn/lxc #2015-11-09/cgns (and > > github.com/hallyn/lxcfs #2015-11-10/cgns) we can start a container in a full > > proper cgroup namespace, avoiding either cgmanager or lxcfs cgroup bind mounts. > > > > This is completely backward compatible and will be completely invisible > > to any existing cgroup users (except for those running inside a cgroup > > namespace and looking at /proc/pid/cgroup of tasks outside their > > namespace.) > > cgroupns-root. > > IIRC one downside of this series was that only the new "sane" cgroup > layout was supported > and hence it was useless for everything which expected the default layout. > Hence, still no systemd for us. :) > > Is this now different? Yes, all hierachies are no supported. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/