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  5. ZFS and libvirt

ZFS and libvirt

Define a pool 

zpool list
NAME   SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
tank  10.9T  2.81T  8.09T        -         -     0%    25%  1.00x    ONLINE  -

virsh # pool-define-as --name zfs --source-name tank --type zfs
Pool zfs defined

virsh #  pool-start zfs
Pool zfs started

virsh # pool-autostart zfs
Pool zfs marked as autostarted

virsh # pool-list
 Name      State    Autostart
-------------------------------
 default   active   yes
 root      active   yes
 tmp       active   yes
 zfs       active   yes


virsh # pool-info zfs
Name:           zfs
UUID:           926e110e-fd90-4866-ae84-8ec2fe4ef01b
State:          running
Persistent:     yes
Autostart:      yes
Capacity:       10.91 TiB
Allocation:     2.81 TiB
Available:      8.10 TiB

virsh #

Create a volume 

virsh # vol-create-as --pool zfs --name vol1 --capacity 1G
Vol vol1 created

virsh # vol-create-as --pool zfs--name vol2 --capacity 700M
Vol vol2 created

virsh # vol-list zfs
Name                 Path
------------------------------------------------------------------------------
vol1                 /dev/zvol/tank/vol1
vol2                 /dev/zvol/tank/vol2


virsh # vol-delete --pool zfs vol2
Vol vol2 deleted

Uploading and downloading data

Let’s upload an image to our new volume:

virsh # vol-upload --pool zfs--vol vol1 --file /tmp/FreeBSD-10.0-RELEASE-amd64-memstick.img

… and download

virsh # vol-download --pool zfs --vol vol1 --file /tmp/zfsfilepool_vol1.img

Note: if you would check e.g. md5 sum of the downloaded files, the result would be different as downloaded file will be of the same size as a volume. However, if you trim zeros, it’ll be the same.

Create VM from virt-install 

virt-install -n test \
    --os-type=Linux \
    --os-variant=debian10 \
    --ram=2048 --vcpus=2 \
    --boot uefi \
    --disk pool=zfs,size=64 \
    --graphics none \
    --console pty,target_type=serial \
    --extra-args 'console=ttyS0,115200n8 serial' \
    --location 'http://ftp.debian.org/debian/dists/stable/main/installer-amd64/'

Source: