Public bug reported:
by default lxc containers do not allow mounting ext4 filesystems.
during 'maas-import-ephemerals', maas uses mount to mount an ext4
filesystem-in-a-file to convert the ephemeral image that it downloads from
http://maas.ubuntu.com/images into a -root.tar.gz file that curtin will use for
installation.
In the end, try to do this, and you'll see something like:
Tue, 03 Dec 2013 17:17:57 +0000: converting
/var/lib/maas/ephemeral/precise/ephemeral/amd64/20131010/disk.img to
/var/lib/maas/ephemeral/precise/ephemeral/amd64/20131010/dist-root.tar.gz
mount: Could not find any loop device. Maybe this kernel does not know
about the loop device? (If so, recompile or `modprobe loop'.)
Tue, 03 Dec 2013 17:17:57 +0000: failed to mount
/var/lib/maas/ephemeral/precise/ephemeral/amd64/20131010/disk.img
http://askubuntu.com/questions/376345/allow-loop-mounting-files-inside-lxc-containers
describes how to modify a container to allow mount.
It is possible that lxc could allow mount of ext4 filesytems inside a
container by default. I will open a task for lxc for that. However,
even if it did, the user-namespace'd lxc container that we should have
in 14.04 will not work with that.
Attached is instructions on how to recreate this on 12.04 (using cloud-
archive). The same should basically work on trusty (using trusty).
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: maas-cluster-controller 1.4+bzr1693+dfsg-0ubuntu2
ProcVersionSignature: Ubuntu 3.12.0-4.12-generic 3.12.1
Uname: Linux 3.12.0-4-generic x86_64
ApportVersion: 2.12.7-0ubuntu1
Architecture: amd64
Date: Tue Dec 3 17:34:18 2013
Ec2AMI: ami-00000611
Ec2AMIManifest: FIXME
Ec2AvailabilityZone: nova
Ec2InstanceType: m1.tiny
Ec2Kernel: aki-00000548
Ec2Ramdisk: ari-00000548
PackageArchitecture: all
ProcEnviron:
TERM=screen
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: maas
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.maas.maas.local.celeryconfig.cluster.py:
# UUID identifying the running cluster controller.
CLUSTER_UUID = '5ccc848a-7a39-4dd5-af61-ad1fa19d183b'
mtime.conffile..etc.maas.maas.cluster.conf: 2013-12-03T17:22:55.003463
mtime.conffile..etc.maas.maas.local.celeryconfig.cluster.py:
2013-12-03T17:22:55.003463
upstart.isc-dhcp-server.override: manual
** Affects: maas
Importance: Undecided
Status: Confirmed
** Affects: lxc (Ubuntu)
Importance: Undecided
Status: Confirmed
** Affects: maas (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug ec2-images trusty
** Attachment added: "instructions for recreating failure"
https://bugs.launchpad.net/bugs/1257389/+attachment/3922253/+files/maas-lxc-bug.txt
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https://bugs.launchpad.net/bugs/1257389
Title:
cannot run maas-import-ephemerals inside lxc container
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