Open Stack

I thought I would send this out since I did not see anything on it already.
If you are running devstack and accidentally run stack.sh you will lose
your LVMs and all configuration. Sure there is that one line you can edit
in stack.sh to not delete LVMs, but it still drops the db so you lose your
configuration anyhow.

Don't panic all is not lost.

Your data is probably still there. Linux does not “clear” data, it merely
marks it as unallocated.

The LVM config files are stored in /etc/lvm/ prior files are in
/etc/lvm/archive .

If you run ls in /etc/lvm/archive notice the files are called
volume_group_XXX.vg

root at stack-1:/etc/lvm/archive# ls -altr
-rw------- 1 root root 1587 Mar  4 12:57 stack-volumes_00069.vg

-rw------- 1 root root 1237 Mar  4 12:57 stack-volumes_00070.vg

-rw------- 1 root root 1524 Mar  5 10:25 stack-volumes_00072.vg

-rw------- 1 root root  805 Mar  5 10:25 stack-volumes_00071.vg

Open a file and look for volume groups that contain your data, look for
volume size or the description line stating “Created *before*…"

root at stack-1:/etc/lvm/archive# grep description *
stack-volumes_00069.vg:description = "Created *before* executing 'lvremove
-f stack-volumes/volume-d767236b-b1c2-4511-ad59-b503a01b24ba'"

Restore the volumes using vgcfgrestore .

  root at stack-1:/etc/lvm/archive# vgcfgrestore stack-volumes -f
stack-volumes_00069.vg
Verify they are online using lvscan

root at stack-1:/dev/stack-volumes# lvscan

  ACTIVE    '/dev/stack-volumes/volume-f7c1d207-8688-4b1e-a8fd-dbe67c923da2'
[10.00 GiB]

  ACTIVE    '/dev/stack-volumes/volume-d767236b-b1c2-4511-ad59-b503a01b24ba'
[20.00 GiB]

  ACTIVE    '/dev/stack-volumes/volume-73bd1860-8940-4091-8539-c4251b7b0823'
[20.00 GiB]

  ACTIVE    '/dev/stack-volumes/volume-0d649e69-3c76-44c9-8e5a-bc0a331820c1'
[40.00 GiB]



Now time to recreate database entries.  Use nova list to pick an image to
create a new image.

root at stack-1:/dev/stack-volumes# nova image-list

+--------------------------------------+--------------------------------------+--------+

| ID                                   | Name
             | Status |

+--------------------------------------+--------------------------------------+--------+

| 2606f66c-29f0-4dcb-abf4-b19519dd4835 | precise-server-cloudimg-amd64
| ACTIVE |

| 716ae8a4-08aa-46ba-8d80-654d93e193af |
precise-server-cloudimg-amd64-kernel | ACTIVE |

+--------------------------------------+--------------------------------------+--------+





Cinder create

root at stack-1:/dev/stack-volumes# cinder create --image-id
2606f66c-29f0-4dcb-abf4-b19519dd4835 --display-name example-volume 20

+---------------------+--------------------------------------+

|       Property      |                Value                 |

+---------------------+--------------------------------------+

|     attachments     |                  []                  |

|  availability_zone  |                 nova                 |

|       bootable      |                false                 |

|      created_at     |      2013-03-05T20:06:35.616902      |

| display_description |                 None                 |

|     display_name    |             example-name             |

|          id         | f52dc1ea-b6da-4aab-8464-50a1a11840b1 |

|       image_id      | 2606f66c-29f0-4dcb-abf4-b19519dd4835 |

|       metadata      |                  {}                  |

|         size        |                  20                  |

|     snapshot_id     |                 None                 |

|     source_volid    |                 None                 |

|        status       |               creating               |

|     volume_type     |                 None                 |

+---------------------+--------------------------------------+



Nova image

root at stack-1:/dev/stack-volumes# nova boot
--image=2606f66c-29f0-4dcb-abf4-b19519dd4835 --flavor 2
--block-device-mapping vda=f52dc1ea-b6da-4aab-8464-50a1a11840b1 --key-name
joem-openstack-key example-instance

+------------------------+--------------------------------------+

| Property               | Value                                |

+------------------------+--------------------------------------+

| status                 | BUILD                                |

| updated                | 2013-03-05T21:08:07Z                 |

| OS-EXT-STS:task_state  | scheduling                           |

| key_name               | joem-openstack-key                   |

| image                  | precise-server-cloudimg-amd64        |

| hostId                 |                                      |

| OS-EXT-STS:vm_state    | building                             |

| flavor                 | m1.small                             |

| id                     | 74f88463-aba9-4208-86ed-ad24f1052d0c |

| security_groups        | [{u'name': u'default'}]              |

| user_id                | 4473cecb13f746a88f08bfaab19ce828     |

| name                   | example-instance              |

| adminPass              | sbK3vbeTDCch                         |

| tenant_id              | 40931001789540ca955d353f3c42bcfc     |

| created                | 2013-03-05T21:08:07Z                 |

| OS-DCF:diskConfig      | MANUAL                               |

| accessIPv4             |                                      |

| accessIPv6             |                                      |

| progress               | 0                                    |

| OS-EXT-STS:power_state | 0                                    |

| metadata               | {}                                   |

| config_drive           |                                      |

+------------------------+--------------------------------------+

Stop the VM

root at stack-1:~# nova list

+--------------------------------------+-------------------------+--------+-----------------------------------+

| ID                                   | Name                    | Status |
Networks                          |

+--------------------------------------+-------------------------+--------+-----------------------------------+

| 74f88463-aba9-4208-86ed-ad24f1052d0c | example-instance | ACTIVE |
private=10.11.12.2, 192.168.157.2 |

+--------------------------------------+-------------------------+--------+-----------------------------------+

root at stack-1:~# nova stop 74f88463-aba9-4208-86ed-ad24f1052d0c

Copy old data to new LVM.

root at stack-1:~# cd /dev/stack-volumes/

root at stack-1:/dev/stack-volumes# ls -1

volume-0d649e69-3c76-44c9-8e5a-bc0a331820c1

volume-73bd1860-8940-4091-8539-c4251b7b0823

volume-d767236b-b1c2-4511-ad59-b503a01b24ba

volume-f52dc1ea-b6da-4aab-8464-50a1a11840b1

volume-f7c1d207-8688-4b1e-a8fd-dbe67c923da2

root at stack-1:/dev/stack-volumes# mkdir /mnt/source ; mkdir /mnt/dest

root at stack-1:/dev/stack-volumes# mount –o ro
volume-d767236b-b1c2-4511-ad59-b503a01b24ba /mnt/source

root at stack-1:/dev/stack-volumes# mount
volume-f52dc1ea-b6da-4aab-8464-50a1a11840b1 /mnt/dest

root at stack-1:/dev/stack-volumes# cp –vr --preserve=all /mnt/source/*
/mnt/dest

root at stack-1:/dev/stack-volumes# umount /mnt/dest; umount /dev/source



Restart

root at stack-1:/dev/stack-volumes# nova start
74f88463-aba9-4208-86ed-ad24f1052d0c


Now that I typed all of that, someone will chime in pointing out a tool
that already exists and  reimports LVMs to openstack...

Hope this helps someone out.

Cheers,

-Joe
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack/attachments/20130306/2a38beaf/attachment.html>