Broken Virtuozzo container
Virtuozzo Storage Platform

Sometimes some broken Virtuozzo container cannot start due to container corruption like example below;

[email protected] [~]# vzctl start 9068405
Mount image: /vz/private/9068405/root.hdd

(i.e., without -a or -p options)
Failed to mount image /vz/private/9068405/root.hdd: Error in e2fsck (fsutils.c:282): e2fsck failed (exit code 4)

Failed to mount image: Error in e2fsck (fsutils.c:282): e2fsck failed (exit code 4)
Unmount image: /vz/private/9068405/root.hdd

**Update** The newest Virtuozzo 7 using UUID style ID for container ID. Just start the container with verbose mode to know the ploop ID.

[[email protected] ~]# vzctl --verbose start 19ddb349-4c36-4607-9be2-4eca20141fd9
Lock /var/vz/19ddb349-4c36-4607-9be2-4eca20141fd9.conf.lck fd=5
Unlock conf fd=5
Lock /vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/.lck fd=5
Lock /var/vz/19ddb349-4c36-4607-9be2-4eca20141fd9.conf.lck fd=7
Unlock conf fd=7
Starting Container ...
running: /usr/sbin/cpufeatures --quiet sync
Unmount image: /vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/root.hdd
[ 0.006408] Unmounting device /dev/ploop23041
[ 0.007739] Opening delta /vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/root.hdd/root.hds
[ 0.008937] Store CBT uuid=1191d70d-f82a-4cee-8a60-f53020e90441 L1Size=1 bytes=204800 blocksize=1048576 offset=33257684992
Container is unmounted
vcmmd: unregister
Mount image: /vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/root.hdd
[ 0.019107] Opening delta /vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/root.hdd/root.hds
[ 0.019219] Opening delta /vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/root.hdd/root.hds
[ 0.801863] Opening delta /vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/root.hdd/root.hds
[ 0.806028] Adding delta dev=/dev/ploop23041 img=/vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/root.hdd/root.hds (rw)
[ 0.816486] Opening delta /vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/root.hdd/root.hds
[ 0.817204] Start CBT uuid=1191d70d-f82a-4cee-8a60-f53020e90441
[ 0.822267] Running: fsck.ext4 -p /dev/ploop23041p1

(i.e., without -a or -p options)
[ 0.901372] Error in e2fsck (fsutils.c:471): e2fsck failed (exit code 4)

Failed to mount image /vz/private/19ddb349-4c36-4607-9be2-4eca20141fd9/root.hdd: Error in e2fsck (fsutils.c:471): e2fsck failed (exit code 4)
Unlock fd=5


Data corruption can occur from a variety of reasons. Usually this can be fixed by doing file system check to the disk image.

First we need to know the ploop ID. This can be done by mounting the ploop image.

[email protected] [~]# ploop mount /vz/private/9068405/root.hdd/DiskDescriptor.xml
Opening delta /pstorage/pcs1-cluster/private/9068405/root.hdd/root.hds
Opening delta /pstorage/pcs1-cluster/private/9068405/root.hdd/root.hds
Adding delta dev=/dev/ploop16823 img=/pstorage/pcs1-cluster/private/9068405/root.hdd/root.hds (rw)

Once we know the ploop ID, we need to know ploop partition device.

[email protected] [~]# fdisk -l /dev/ploop16823

WARNING: GPT (GUID Partition Table) detected on '/dev/ploop16823'! The util fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/ploop16823: 107.4 GB, 107374182400 bytes
255 heads, 63 sectors/track, 13054 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/ploop16823p1 1 13055 104857599+ ee GPT

Actually there are an easy fix using fsck to repair the container.

[email protected] [~]# fsck /dev/ploop16823p1 -Cy
fsck from util-linux-ng 2.17.2
e2fsck 1.41.12 (17-May-2010)
/dev/ploop16823p1: clean, 807261/6553600 files, 16353823/26213888 blocks

Umount back the ploop.

[email protected] [~]# ploop umount -d /dev/ploop16823p1
Unmounting device /dev/ploop16823
Opening delta /pstorage/pcs1-cluster/private/9068405/root.hdd/root.hds

Start back the container.

[email protected] [~]# vzctl --verbose start 9068405
Mount image: /vz/private/9068405/root.hdd
Container is mounted
Starting the Container ...
running: /usr/sbin/cpufeatures --quiet sync
running: /usr/sbin/vzpkg info -q centos-6-x86_64 osrelease
Warning: VSwap_slm compatiblity mode all
RAM: 2097152 Swap: 0 ovr: 1.00
UB_LOCKEDPAGES, {2097152, 2097152}
UB_PRIVVMPAGES, {9223372036854775807, 9223372036854775807}
UB_NUMPROC, {500, 500}
UB_PHYSPAGES, {2097152, 2097152}
UB_VMGUARPAGES, {2097152, 2097152}
UB_OOMGUARPAGES, {2097152, 2097152}
CPU limit: 100%
Running the command: /etc/sysconfig/vz-scripts/vz-start
Setting permissions 20002 dev 0x7d00
Adding offline management to Container(1): 4643
Adding IP addresses:
Running the command: /etc/sysconfig/vz-scripts/vz-net_add
Run the script /etc/sysconfig/vz-scripts/dists/scripts//
Hostname of the Container set:
Run the script /etc/sysconfig/vz-scripts/dists/scripts//
Run the script /etc/sysconfig/vz-scripts/dists/scripts//
File resolv.conf was modified
Run the script /etc/sysconfig/vz-scripts/dists/scripts//
Starting the Container ...

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