[Bug 1183354] [NEW] lxc-clone makes unbootable clone when using lvm backing store

Thu May 23 13:42:09 UTC 2013

Public bug reported:

Container clones made by lxc-clone is not bootable.
New container config misses lxc.rootfs.
lxc.network.hwaddr is the same as in original container.

# lsb_release -rd
Description:	Ubuntu 13.04
Release:	13.04

# apt-cache policy lxc
lxc:
  Installed: 0.9.0-0ubuntu3
  Candidate: 0.9.0-0ubuntu3
  Version table:
 *** 0.9.0-0ubuntu3 0
        500 http://ru.archive.ubuntu.com/ubuntu/ raring/universe amd64 Packages
        100 /var/lib/dpkg/status

Steps to reproduce:
root at lxc-host:~# lxc-create -n ubuntu -t ubuntu -B lvm --fssize 5gb

lxc-create: No config file specified, using the default config /etc/lxc/default.conf
  Logical volume "ubuntu" created
mke2fs 1.42.5 (29-Jul-2012)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
327680 inodes, 1310720 blocks
65536 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=1342177280
40 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
 32768, 98304, 163840, 229376, 294912, 819200, 884736

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

Checking cache download in /var/cache/lxc/raring/rootfs-amd64 ...
Copy /var/cache/lxc/raring/rootfs-amd64 to /var/lib/lxc/ubuntu/rootfs ...
Copying rootfs to /var/lib/lxc/ubuntu/rootfs ...
Generating locales...
  en_US.UTF-8... up-to-date
Generation complete.

##
# The default user is 'ubuntu' with password 'ubuntu'!
# Use the 'sudo' command to run tasks as root in the container.
##

'ubuntu' template installed
Unmounting LVM
'ubuntu' created
root at lxc-host:~#
root at lxc-host:~# lxc-clone -o ubuntu -n ubuntu_clone
Tweaking configuration
Copying rootfs...
  Logical volume "ubuntu_clone_snapshot" created
mkdir: cannot create directory ‘/dev/lxc/ubuntu_clone_snapshot’: File exists

root at lxc-host:~# diff /var/lib/lxc/ubuntu/config /var/lib/lxc/ubuntu_clone/config
9d8
< lxc.mount = /var/lib/lxc/ubuntu/fstab
16d14
< lxc.utsname = ubuntu
52c50,51
< lxc.rootfs = /dev/lxc/ubuntu
---
> lxc.utsname = ubuntu_clone
> lxc.mount = /var/lib/lxc/ubuntu_clone/fstab

If I manually add lxc.rootfs=/dev/lxc/ubuntu_clone_snapshot to
/var/lib/lxc/ubuntu_clone/config, container starts normally.

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: lvm lxc lxc-clone

** Tags added: lvm

** Description changed:

+ Container clones made by lxc-clone is not bootable.
+ New container config misses lxc.rootfs.
+ lxc.network.hwaddr is the same as in original container.
+ 
+ 
  # lsb_release -rd
  Description:	Ubuntu 13.04
  Release:	13.04

- Container clones made by lxc-clone is not bootable.
- New container config misses lxc.rootfs.
- lxc.network.hwaddr is the same as in original container.
+ # apt-cache policy lxc
+ lxc:
+   Installed: 0.9.0-0ubuntu3
+   Candidate: 0.9.0-0ubuntu3
+   Version table:
+  *** 0.9.0-0ubuntu3 0
+         500 http://ru.archive.ubuntu.com/ubuntu/ raring/universe amd64 Packages
+         100 /var/lib/dpkg/status
+ 

  Steps to reproduce:
  root at lxc-host:~# lxc-create -n ubuntu -t ubuntu -B lvm --fssize 5gb

  lxc-create: No config file specified, using the default config /etc/lxc/default.conf
-   Logical volume "ubuntu" created
+   Logical volume "ubuntu" created
  mke2fs 1.42.5 (29-Jul-2012)
  Filesystem label=
  OS type: Linux
  Block size=4096 (log=2)
  Fragment size=4096 (log=2)
  Stride=0 blocks, Stripe width=0 blocks
  327680 inodes, 1310720 blocks
  65536 blocks (5.00%) reserved for the super user
  First data block=0
  Maximum filesystem blocks=1342177280
  40 block groups
  32768 blocks per group, 32768 fragments per group
  8192 inodes per group
- Superblock backups stored on blocks: 
- 	32768, 98304, 163840, 229376, 294912, 819200, 884736
+ Superblock backups stored on blocks:
+  32768, 98304, 163840, 229376, 294912, 819200, 884736

- Allocating group tables: done                            
- Writing inode tables: done                            
+ Allocating group tables: done
+ Writing inode tables: done
  Creating journal (32768 blocks): done
- Writing superblocks and filesystem accounting information: done 
+ Writing superblocks and filesystem accounting information: done

- Checking cache download in /var/cache/lxc/raring/rootfs-amd64 ... 
- Copy /var/cache/lxc/raring/rootfs-amd64 to /var/lib/lxc/ubuntu/rootfs ... 
+ Checking cache download in /var/cache/lxc/raring/rootfs-amd64 ...
+ Copy /var/cache/lxc/raring/rootfs-amd64 to /var/lib/lxc/ubuntu/rootfs ...
  Copying rootfs to /var/lib/lxc/ubuntu/rootfs ...
  Generating locales...
-   en_US.UTF-8... up-to-date
+   en_US.UTF-8... up-to-date
  Generation complete.

  ##
  # The default user is 'ubuntu' with password 'ubuntu'!
  # Use the 'sudo' command to run tasks as root in the container.
  ##

  'ubuntu' template installed
  Unmounting LVM
  'ubuntu' created
- root at lxc-host:~# 
+ root at lxc-host:~#
  root at lxc-host:~# lxc-clone -o ubuntu -n ubuntu_clone
  Tweaking configuration
  Copying rootfs...
-   Logical volume "ubuntu_clone_snapshot" created
+   Logical volume "ubuntu_clone_snapshot" created
  mkdir: cannot create directory ‘/dev/lxc/ubuntu_clone_snapshot’: File exists

  root at lxc-host:~# diff /var/lib/lxc/ubuntu/config /var/lib/lxc/ubuntu_clone/config
  9d8
  < lxc.mount = /var/lib/lxc/ubuntu/fstab
  16d14
  < lxc.utsname = ubuntu
  52c50,51
  < lxc.rootfs = /dev/lxc/ubuntu
  ---
  > lxc.utsname = ubuntu_clone
  > lxc.mount = /var/lib/lxc/ubuntu_clone/fstab

  If I manually add lxc.rootfs=/dev/lxc/ubuntu_clone_snapshot to
  /var/lib/lxc/ubuntu_clone/config, container starts normally.

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https://bugs.launchpad.net/bugs/1183354

Title:
  lxc-clone makes unbootable clone when using lvm backing store

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