Public bug reported:
This report is against the latest (as of now, 2011-11-27, 02:01 GMT-2)
Oneiric's x64 cloud image, available on http://cloud-
images.ubuntu.com/oneiric/current/ (which is Ubuntu 11.10 (Oneiric
Ocelot) Daily Build [20111124]).
I tried to launch an instance on my Eucalyptus cloud, but I wouldn't
boot. I started digging, and found many issues with this image.
#####
(1) Wrong Kernel
(a) Symptom.
The kernel said it couldn't find /dev/sda1: VFS: Cannot open root device "sda1"
or unknown-block(0,0).
(b) Analysis.
Somehow I noticed that the kernel that came in the tarball was the "-generic"
one, and not the "-virtual" one (as is the case with Natty, for example, which
works fine). The file is called
"oneiric-server-cloudimg-amd64-vmlinuz-generic". Chrooting into the image,
`dpkg -l | grep linux` shows that linux-image-generic is installed, where I'd
expect linux-image-virtual.
(c) Solution.
I removed the -generic kernel packages, installed the -virtual kernel packages
(`apt-get purge linux-image-generic linux-image-virtual+`), cleaned up /boot by
removing the -generic images (rm /boot/*-generic*), and modified by hand
/boot/grub/grub.cfg (replace all instances of -generic by -virtual). [note: I
tried update-grub, but it wrote a completely different grub.cfg file, then I
decided to revert it and edit grub.cfg by hand].
Then I removed the kernel that came in the tarball ball
(oneiric-server-cloudimg-amd64-vmlinuz-generic) and replaced it with the
-virtual one from inside the image (`cp work/boot/vmlinuz-3.0.0-13-virtual
oneiric-server-cloudimg-amd64-vmlinuz-virtual`).
The boot would now find /dev/sda1, as expected.
(2) Broken /etc/fstab
(a) Symptom.
At the end of the output from the virtual machine, I'd see "mount: mount point
ext4 does not exist", and it wouldn't finish the boot sequence
(b) Analysis.
The file /etc/fstab is malformed. The contents of the file are:
LABEL=cloudimg-rootfs ext4 defaults 0 1
That's all. It is obviously missing the mount point (/), as one would
expect from the error message. Comparing it to Natty's cloud image
fstab, it seems to be missing /proc as well.
(c) Solution.
Replace the contents of the file with:
proc /proc proc nodev,noexec,nosuid 0 0
LABEL=cloudimg-rootfs / ext4 defaults 0 1
(3) Broken /etc/network/interfaces
(b) Analysis.
The file /etc/network/interfaces does not configure the device eth0, only the
loopback device. The original content of the file is:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
(c) Solution.
Add the following configuration for eth0 (copied from Natty), at the end of
/etc/network/interfaces:
# The primary network interface
auto eth0
iface eth0 inet dhcp
#####
After all these fixes, the instance finally managed to boot. Apparently
it is working. However, there might be more bugs I couldn't detect (and
that would not interfere with the boot sequence).
I urge you to fix this image, and to double check it.
Oh, and ***please make it easier to report bugs***. I lost more than 1
hour only to find this form (even asking at #ubuntu-server and
#launchpad). It's really disgusting when you want to help and the system
makes it extremelly difficult to help.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/896772
Title:
Oneiric's x64 cloud image [20111124] won't boot (wrong kernel, buggy
/etc/fstab, buggy /etc/network/interfaces)
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