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Installation of a ubuntu 20.04 server

#1

Hello

I’m trying to install a ubuntu 20.04 server in the public cloud using the nova command.
I’m using this procedure:

INSTANCE_NAME=“test-instance-nova"
KEYPAIR_NAME=”<my_key_pair>"
FLAVOR_ID=“0da61e94-ce69-4971-b6df-c410fa3659ec” (i.e. b2-7)
IMAGE_ID=“4eb00532-a808-4545-8bc1-e54ec2b94bed” (i.e. Ubuntu 20.04)
nova boot --key-name ${KEYPAIR_NAME} --flavor ${FLAVOR_ID} --image ${IMAGE_ID} ${INSTANCE_NAME}

At this point the server is up and running but there is no persistent disk.

Following the procedure described on this page https://docs.ovh.com/us/en/public-cloud/start-instance-on-a-volume/ , I created a new boot-volume:

BOOT_VOLUME_NAME=${INSTANCE_NAME}-boot
BOOT_VOLUME_SIZE=50
BOOT_VOLUME_TYPE=“classic”

cinder create --volume-type ${BOOT_VOLUME_TYPE} --image-id ${IMAGE_ID} --display_name ${BOOT_VOLUME_NAME} ${BOOT_VOLUME_SIZE}
BOOT_VOLUME_ID="<the_boot_volume_id>"
cinder metadata ${BOOT_VOLUME_ID} set boot_from=True
nova volume-attach ${INSTANCE_NAME} ${BOOT_VOLUME_ID}
nova reboot --hard ${INSTANCE_NAME}

At this point, it seems to be fine

ubuntu@test-instance-nova:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 69.8M 1 loop /snap/lxd/19032
loop1 7:1 0 55.4M 1 loop /snap/core18/1944
loop2 7:2 0 31.1M 1 loop /snap/snapd/10707
loop3 7:3 0 55.5M 1 loop /snap/core18/1988
loop4 7:4 0 31.1M 1 loop /snap/snapd/11036
loop5 7:5 0 69.9M 1 loop /snap/lxd/19188
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 49.9G 0 part
├─sda14 8:14 0 4M 0 part
└─sda15 8:15 0 106M 0 part
sdb 8:16 0 50G 0 disk
├─sdb1 8:17 0 49.9G 0 part /
├─sdb14 8:30 0 4M 0 part
└─sdb15 8:31 0 106M 0 part /boot/efi

The / is mounted on sdb1

I reboot the server
ubuntu@test-instance-nova:~$ sudo reboot

At this point, it breaks

ubuntu@test-instance-nova:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 69.8M 1 loop /snap/lxd/19032
loop1 7:1 0 69.9M 1 loop /snap/lxd/19188
loop2 7:2 0 55.4M 1 loop /snap/core18/1944
loop3 7:3 0 31.1M 1 loop /snap/snapd/10707
loop4 7:4 0 31.1M 1 loop /snap/snapd/11036
loop5 7:5 0 55.5M 1 loop /snap/core18/1988
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 49.9G 0 part /
├─sda14 8:14 0 4M 0 part
└─sda15 8:15 0 106M 0 part
sdb 8:16 0 50G 0 disk
├─sdb1 8:17 0 49.9G 0 part
├─sdb14 8:30 0 4M 0 part
└─sdb15 8:31 0 106M 0 part /boot/efi

The / is mounted on sda1 (not the boot volume)

All the data and configuration that I have done are lost.

Does someone have an idea of how to solve this problem?
Do I make a mistake in the installation procedure?

Thanks

Greg

#2

Hi,

If you want to create an instance that boots from a volume this is the steps to follow (example):

  1. Create the volume first
    openstack volume create --size 50 --type classic --image “Ubuntu 20.04” --bootable NameOfVolume

  2. Create the instance:
    openstack server create --network Ext-Net --flavor s1-2 --key-name test --volume UUID myinstancename

These steps will actually create the VM to boot from the volume. However, be aware if you create an instance that boots from the volume, you will not benefit from the local storage of the instance. Just the volume.