resize-openstack-vm-volumes.md

Resizing Openstack VM's Volumes

Problem:

1. to resize the volume, the volume must be detached first.
2. but if it is the only boot volume, or the vm is created by the volume, it cannot be detached.

Solution (after shutdown the VM):

1. Login . ~/keystone_admin
2. Check volume ID, VM ID by cinder list or openstack volume list, for ex.

VOLUME=ce6e79c1-5b57-49aa-9a66-acf17f37be70 VM=06e7979a-e23e-4f02-9b57-2bc70442be0a

3. Go into mysql: mysql
4. change the volume's mount to other than /dev/vda so it can be unmouted.

use cinder;
select * from volume_attachment where volume_id='ce6e79c1-5b57-49aa-9a66-acf17f37be70';
update volume_attachment set mountpoint='/dev/vdb' where volume_id='ce6e79c1-5b57-49aa-9a66-acf17f37be70';

use nova;
select * from block_device_mapping where volume_id='ce6e79c1-5b57-49aa-9a66-acf17f37be70';
update block_device_mapping set device_name='/dev/vdb', boot_index=1 where volume_id = 'ce6e79c1-5b57-49aa-9a66-acf17f37be70' and deleted_at is NULL;

5. detach the volume from the VM

openstack server remove volume 06e7979a-e23e-4f02-9b57-2bc70442be0a ce6e79c1-5b57-49aa-9a66-acf17f37be70

6. resize the volume (e.g. to 100GB)

openstack volume set ce6e79c1-5b57-49aa-9a66-acf17f37be70 --size 100

7. re-mount the volume

openstack server add volume 06e7979a-e23e-4f02-9b57-2bc70442be0a ce6e79c1-5b57-49aa-9a66-acf17f37be70

8. Go into mysql and change back to /dev/vda

use nova;
update block_device_mapping set device_name='/dev/vda' where volume_id='ce6e79c1-5b57-49aa-9a66-acf17f37be70' and deleted_at is NULL;

use cinder;
update volume_attachment set mountpoint='/dev/vda' where volume_id='ce6e79c1-5b57-49aa-9a66-acf17f37be70' and deleted=0;