From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael H. Warfield" Subject: Re: [Devel] Re: LXC container, unmounting unneeded mount points (from the container namespace) Date: Mon, 11 Jan 2010 23:03:57 -0500 Message-ID: <1263269037.14592.60.camel@localhost> References: <8e04b5821001080608w47b0529dhcd6f8a26e38f24e0@mail.gmail.com> <4B473E89.1040200@free.fr> <8e04b5821001080625j22517f1i22ec3495d8d1e53b@mail.gmail.com> <4B4742A8.1000708@free.fr> <1263268449.14592.53.camel@localhost> Reply-To: mhw-BetbSzk+GohWk0Htik3J/w@public.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============6267856188547123392==" Return-path: In-Reply-To: <1263268449.14592.53.camel@localhost> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Mime-version: 1.0 Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Daniel Lezcano Cc: mhw-BetbSzk+GohWk0Htik3J/w@public.gmane.org, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, "Ciprian Dorin, Craciun" , lxc-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: containers.vger.kernel.org --===============6267856188547123392== Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-2ERdDDOuQSdHUFGFw513" --=-2ERdDDOuQSdHUFGFw513 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2010-01-11 at 22:54 -0500, Michael H. Warfield wrote:=20 > Added lxc-devel to the cc list since this seems to be more appropriate > over there (maybe) and I've just joined that one as well. >=20 > On Fri, 2010-01-08 at 15:35 +0100, Daniel Lezcano wrote:=20 > > Ciprian Dorin, Craciun wrote: > > > On Fri, Jan 8, 2010 at 4:17 PM, Daniel Lezcano wrote: > > > =20 > > >> Ciprian Dorin, Craciun wrote: > > >> =20 > > >>> Hy all! > > >>> > > >>> Today I've started to play with the LXC containers, and I've got= a > > >>> question: when starting a container (with it's own mount point > > >>> namespace), and I do a `cat /proc/mounts` I also see the mount poin= ts > > >>> from my host system. > > >>> > > >>> So the question is: how can I force `lxc-create` to remove any > > >>> uneeded mount points (maybe all)? > > >>> > > >>> =20 > > >> Committed today :) > > >> > > >> http://git.lab.toulouse-stg.fr.ibm.com/?p=3Dlxc.git;a=3Dcommit;h=3De= d83715df7666879116d1657b1dd54a8fc6513f6 > > >> =20 > > Oops, this one: > > http://lxc.git.sourceforge.net/git/gitweb.cgi?p=3Dlxc/lxc;a=3Dcommit;h= =3Dbf601689a9e0cea1ceaf17e4f7f853f5392c2827 > Nice. This is EXACTLY what I've been looking for as well. Only problem > is... It didn't work. It complains about: > lxc-start: could not umount 1 mounts" > Then terminates saying it can't start the container. > When I throw in some debugging prints, I find out that it's complaining > that it can't umount {pivotdir}/dev. Commented out the return -1's in > that routine so it starts the container anyways and jump into the > running container and I discover that {pivotdir}/dev/shm is still > mounted even though it thinks it umounted it. I can see from the > debugging prints that it seems to have successfully umount it (the > debugging message indicates that it umounted it - so it saw it had it > and tried and got a good return from the attempt) but it's apparently > still mount. If I umount that {pivotdir}/dev/shm inside the container, > I can then umount {pivotdir}/dev and {pivotdir}.=20 > Tried it both by defining lxc.pivotdir and by letting it choose a > temporary one. Tried two different containers. Same result. : Crud... I always forget to mention SOMETHING... On the host system /dev/shm is a tmpfs file system. =46rom mount: tmpfs on /dev/shm type tmpfs (rw) It's in my /etc/fstab like this: tmpfs /dev/shm tmpfs defaults 0 0 Seems to be that way on all my Fedora and CentOS systems. I can umount that in the host system (doesn't SEEM to do any harm) and then lxc-start works just fine and can pivot the root and unmount everything. Seems to be something to do with tmpfs. > Of course we also have the strange "rootfs" entry there as well. > Host system is Fedora 12. > Host kernel is: 2.6.31.9-174.fc12.i686 > Guest system in each case is CentOS 5.4 >=20 > Regards, > Mike Mike --=20 Michael H. Warfield (AI4NB) | (770) 985-6132 | mhw-BetbSzk+GohWk0Htik3J/w@public.gmane.org /\/\|=3Dmhw=3D|\/\/ | (678) 463-0932 | http://www.wittsend.com= /mhw/ NIC whois: MHW9 | An optimist believes we live in the best of a= ll PGP Key: 0x674627FF | possible worlds. A pessimist is sure of it! --=-2ERdDDOuQSdHUFGFw513 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEVAwUAS0v0rMDrlnVnRif/AQLcJAgAhkAEtdPJI5zWCqLZKxtER9WKTlfaqEyK /H6JKQ/czS9DupPnZ9LI0EMR7Wgq18mBGZzv+yds5SIjxgbvf87wqUbUqjWX5cYL L6zJVMAj10O/OQqeMJAugNzG5j6uZjFGqdjsAxuCa8BS2cKMabKA8ltgVqwgp42G xAfaGFYpG4bLG1dl73uPhBCviHiAEtXl5Hgb54SVVaKgZP56SGH+U8fy+dYsW4ff swlm7qaIQanorR2kqNjYYDsGZ4657AtqQbjYU53GhQjYFhRbzcDuKUk0nnpbfPpG sBL93EdwHC6cneqn6U/HT95fr2uZ4rZuOYn4aRpQnvS7YIExfUQNbQ== =eBhl -----END PGP SIGNATURE----- --=-2ERdDDOuQSdHUFGFw513-- --===============6267856188547123392== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Containers mailing list Containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org https://lists.linux-foundation.org/mailman/listinfo/containers --===============6267856188547123392==--