Homelab, Linux & ABAP (~˘▾˘)~

[ZFS] Send unencrypted dataset to encrypted pool

I recently added some disks to my TrueNAS server and created a new encrypted pool named data2 on it. My old pool data was created years ago, before the zfs encryption feature was released, so it is an unencrypted pool. Now I wanted to move a dataset, i.e. photos, to my new pool data2. I tried to archieve this via TrueNAS Gui using the Replication Task, but always got errors that it’s not possible to send unencrypted data to an encrypted pool.

On Reddit I found a thread with a solution using the parameter -x encryption.

Because I prefer keeping all my snapshots when moving a dataset, I send my oldest snapshot first.

zfs send -v data/photos@manual-01-05-2019 | zfs recv -x encryption data2/photos

In the next step I created a new snapshot and did an incremental send with the parameter -I (send incremental snapshots).

zfs send -v -I data/photos@manual-01-05-2019 data/photos@manual-01-10-2020 | zfs recv -F -x encryption data2/photos

Compare the datasets with zfs diff (see example here) or use the classic diff command to compare the folders:

diff -qr /mnt/data/photos /mnt/data2/photos
#or in background
diff -qr /mnt/data/photos /mnt/data2/photos >> diff.output & disown
#check if process finished with "ps"
less diff.output

Check if all Snapshots were replicated with:

zfs list -t snapshot | grep data2/photos

After that I just changed the path for my NFS photo share and did a sudo mount -a on the clients. Now the whole dataset is moved and encrypted.

[Jellyfin] Deleting files on a mounted dataset inside LXC

If you have installed Jellyfin inside LXC and have all your media mounted from a ZFS dataset inside your container, it’s possible that you are not able to delete files directly from the Jellyfin WebUi. In this case, you have to add the user “jellyfin” to a group with write access on your dataset. In my case, the group “nocin”.

usermod -a -G nocin jellyfin

[Proxmox] Mount dataset into LXC

Open LXC config file in your favorite editor. In this case the container name is 101:

nano /etc/pve/lxc/101.conf

Append a single line for each mountpoint you want to add. The first mountpoint is “mp0”, the second “mp1” and so on.

mp0: /data/music,mp=/mnt/nfs/music

First the source (my zpool “data”, folowing the dataset name “music”), after that the destination inside the container beginning “mp=”.