By default, a ZFS file system is automatically mounted when it is created. Any file system whose mountpoint property is not legacy is managed by ZFS.
List your pools
Type the following command:
# zpool list
Sample outputs:
NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT data 1.48T 142G 1.35T - 5% 9% 1.00x ONLINE - nginxwww 131G 40.3G 90.7G - 22% 30% 1.00x ONLINE -
Create zfs file system called data/vm_guests
Type the following command:
# zfs create data/vm_guests
Get mountpoint for data/vm_guests
# zfs get mountpoint data/vm_guests
Sample outputs:
Fig.01: Get the mountpoint for the dataset
Is it mounted?
# zfs get mounted data/vm_guests
Sample outputs:
Fig.02: Get the mountpoint status of the dataset
If not mounted, mount ZFS file system explicitly
You can explicitly set the mountpoint property for zfs file system on Linux/Unix/FreeBSD as shown in the following example:
# zfs set mountpoint=/YOUR-MOUNT-POINT pool/fs
# zfs set mountpoint=/my_vms data/vm_guests
# cd /my_vms
# df /my_vms
# zfs get mountpoint data/vm_guests
# zfs get mounted data/vm_guests
Sample outputs:
Fig.03: Modifying ZFS dataset mountpoints and mount ZFS file system as per needs
# zfs mount -a
How do I see a list of all zfs mounted file system?
Tyep the following command:
# zfs mount
# zfs mount | grep my_vms
Unmounting ZFS file systems
# zfs unmount data/vm_guests
See also
See zfs(8) command man page for more info:
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Please note that on systemd based services there are following services which need to be enabled in order to have zpool imported automatically as well as zfs filesystem mounted:
zfs-import-cache.service
zfs-mount.service
Thanks for the tutorial. It helped me solve the mount issue in no time at all compared to my still unsolved issue with using the -V option for ZVOL created ZFS file systems.
With Ubuntu Server 16.04, I couldn’t reliably get my OS mounted ZVOLs to load at boot before KVM/Virsh defaulted my default-named storage pool back to their default directory instead of my mounted zd02, for example, in /mnt/zd02. My ZVOL had two partitions formatted with ext4.
The standard ZFS file system created as explained here seems to be working good and holding true as my VM storage layer. I’m updating things on my other servers now to match this method.
I added this property option when creating the file systems as a single command solution:
zfs create -o mountpoint=/MOUNTDIRECTORY POOLNAME/FSNAME
Thanks!