ZFS
Decisions
- While encrypting the pool volume is possible, I decided to go with a sub-volume, just in case I need to add un-encrypted data later
- The options for encryption keys passphrase, raw key, and hex key. I'll be using a hex key for ease of backup in my password database.
- When creating the pool use the entire disk, not partitions where possible
- When creating the pool, use /dev/disk/by-id, not /dev/sda, as these can change on boot
Links
Create the pool
Grab the disk IDs as shown below, and use those IDs to create the pool
ls -lah /dev/disk/by-id
zpool create datapool -o ashift=12 -o autoexpand=on mirror diskID1 diskID1
zfs set compression=lz4 datapool
zfs set atime=off datapool
Creating the Volume
- Normal Dataset
zfs create poolname/datasetname
- Encrypted Dataset
mkdir /etc/zfs/keys
chmod 700 /etc/zfs/keys
openssl rand -hex -out /etc/zfs/keys/datasetname 32
chmod 600 /etc/zfs/keys/datasetname
zfs create -o encryption=aes-256-gcm -o keyformat=hex -o keylocation=file:///etc/zfs/keys/datasetname poolname/datasetname
Backing up data
- Create an initial snapshot and backup
zfs snapshot -r poolname@snap1
zfs send -R poolname@snap1 | zfs recv -Fdu backuppool
- After some changes, send an incremental
zfs snapshot -r poolname@snap2
zfs send -R -I poolname@snap1 poolname@snap2 | zfs recv -Fdu backuppool
zfs destroy -r poolname@snap1