Ubuntu
lxc package

lxc-create fails: cp: will not create hard link...

Bug #913877 reported by Robie Basak
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
debootstrap (Ubuntu)
Invalid
Undecided
Unassigned
lxc (Ubuntu)
Fix Released
High
Unassigned

Bug Description

Steps to reproduce:

1. Start with a machine running a fresh Precise cloud image
2. apt-get update && apt-get dist-upgrade
3. apt-get install lxc
4. cat > lxc.conf <<EOF
lxc.network.type=veth
lxc.network.link=test_network
lxc.network.flags=up
EOF
5. lxc-create -n test_container -t ubuntu -f lxc.conf -- -r oneiric

Command fails with:
Download complete
Copy /var/cache/lxc/oneiric/rootfs-amd64 to /var/lib/lxc/test_container/rootfs ...
Copying rootfs to /var/lib/lxc/test_container/rootfs ...cp: will not create hard link `/var/lib/lxc/test_container/rootfs/run/shm' to directory `/var/lib/lxc/test_container/rootfs/dev/shm'
Failed to copy rootfs
failed to install ubuntu oneiric
failed to execute template 'ubuntu'

Oddly, note the inode numbers below:

ubuntu@precise-test2:/var/cache/lxc/oneiric/rootfs-amd64$ stat dev/shm run/shm
  File: `dev/shm'
  Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: fd01h/64769d Inode: 136776 Links: 2
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-01-09 16:24:07.142185754 +0000
Modify: 2012-01-09 16:23:29.494185766 +0000
Change: 2012-01-09 16:23:29.494185766 +0000
 Birth: -
  File: `run/shm'
  Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: fd01h/64769d Inode: 136776 Links: 2
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-01-09 16:24:07.142185754 +0000
Modify: 2012-01-09 16:23:29.494185766 +0000
Change: 2012-01-09 16:23:29.494185766 +0000
 Birth: -

dev and run appear to be independent directories:

ubuntu@precise-test2:/var/cache/lxc/oneiric/rootfs-amd64$ ls -ld dev run
drwxr-xr-x 4 root root 4096 Jan 9 16:23 dev
drwxr-xr-x 5 root root 4096 Jan 9 16:24 run
ubuntu@precise-test2:/var/cache/lxc/oneiric/rootfs-amd64$ stat dev run
  File: `dev'
  Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: fd01h/64769d Inode: 131566 Links: 4
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-01-09 16:23:48.418185766 +0000
Modify: 2012-01-09 16:23:29.494185766 +0000
Change: 2012-01-09 16:23:29.494185766 +0000
 Birth: -
  File: `run'
  Size: 4096 Blocks: 8 IO Block: 4096 directory
Device: fd01h/64769d Inode: 131572 Links: 5
Access: (0755/drwxr-xr-x) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2012-01-09 16:24:08.302185766 +0000
Modify: 2012-01-09 16:24:04.106185766 +0000
Change: 2012-01-09 16:24:04.106185766 +0000
 Birth: -

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lxc 0.7.5-3ubuntu4
ProcVersionSignature: User Name 3.2.0-8.14-virtual 3.2.0
Uname: Linux 3.2.0-8-virtual x86_64
ApportVersion: 1.90-0ubuntu1
Architecture: amd64
Date: Mon Jan 9 16:38:10 2012
Ec2AMI: ami-00000129
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.small
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
ProcEnviron:
 LC_COLLATE=C
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: lxc
UpgradeStatus: No upgrade log present (probably fresh install)

Revision history for this message
Robie Basak (racb) wrote :
Revision history for this message
Robie Basak (racb) wrote :

It looks like debootstrap is leaving bind mounts around.

Revision history for this message
Serge Hallyn (serge-hallyn) wrote :

Turns out it's not debootstrap. It's the subsequent apt-get dist-upgrade with oneiric-updates and oneiric-security added to /etc/apt/sources.list that's leaving the mount behind.

Changed in debootstrap (Ubuntu):
status: New → Invalid
Revision history for this message
Serge Hallyn (serge-hallyn) wrote :

A simple but ugly way we could work around this would be to do the apt-get dist-upgrade inside a private mounts namespace (using lxc-unshare -s MOUNT -- chroot "$1/partial-${arch}" apt-get dist-upgrade -y)

Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package lxc - 0.7.5-3ubuntu5

---------------
lxc (0.7.5-3ubuntu5) precise; urgency=low

  [ Robie Basak ]
  * debian/patches/0015-ubuntu-templ-use-updates.patch: use ports.ubuntu.com
    in sources.list for alternative architectures (LP: #820715).
  * debian/patches/0015-ubuntu-templ-use-updates.patch: dist-upgrade in an
    isolated environment to avoid leaving a bind mount behind (LP: #913877).
  * debian/lxc.{default,init}: call ifconfig with explicit netmask
    (LP: #913727).

  [ Serge Hallyn ]
  * debian/lxc.default: update the MIRROR example - using 'localhost'
    fails for updates after the container has been started.
  * debian/lxcguest.console.upstart: pass 'console' not '/dev/console' to
    getty. (LP: #913952)
  * debian/patches/0015-ubuntu-templ-use-updates.patch: at post_process(),
    copy host's /etc/resolv.conf (which may have changed) into chroot before
    apt-get actions, and always do a apt-get update before installing lxcguest,
    as the package version may have changed in the archive. (LP: #914155)
  * 0016-nested-cgroups.patch: nest container cgroups under the host's
    init cgroup. (LP: #901482)
  * 0017-pull-upstream-fedora-template.patch: move to the upstream
    lxc-fedora template (LP: #881903)
  * 0018-make-lxc-ps-search-proc.patch: work when cgroups are mounted with
    '-n'.
  * debian/patches/0019-fix-lxc-ls-nested-cgroups.patch: fix lxc-ls to
    handle the support for nested cgroups. (pull this into previous
    commit msg before pushing)
 -- Serge Hallyn <email address hidden> Tue, 10 Jan 2012 18:51:45 +0000

Changed in lxc (Ubuntu):
status: Triaged → Fix Released
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