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ZFS install instructions (#37)

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* ZFS install (for Focal)
* ZFS with Docker and LXD

Co-authored-by: Gauthier Provost <gauthier@kobol.io>
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When you already have a working ZFS pool (see [here](/helios64/software/zfs/install-zfs/)) and want to use LXD - it is good idea to configure them together.
## **Step 1** - Prepare filesystem
```bash
sudo zfs create -o mountpoint=none mypool/lxd-pool
```
## **Step 2** - Install LXD
```bash
sudo apt install lxd
```
You might want this:
```bash
sudo usermod -aG lxd <your-username>
```
## **Step 3** - Configure LXD
```bash
sudo lxc init
```
Configure ZFS this way:
```bash
Do you want to configure a new storage pool (yes/no) [default=yes]? yes
Name of the new storage pool [default=default]:
Name of the storage backend to use (dir, btrfs, ceph, lvm, zfs) [default=zfs]: zfs
Create a new ZFS pool (yes/no) [default=yes]? no
Name of the existing ZFS pool or dataset: mypool/lxd-pool
[...]
```
## **Step 4** - Optional
If you use zfs-auto-snapshot, you might want to consider this:
```bash
sudo zfs set com.sun:auto-snapshot=false mypool/lxd-pool
sudo zfs set com.sun:auto-snapshot=true mypool/lxd-pool/containers
sudo zfs set com.sun:auto-snapshot=true mypool/lxd-pool/custom
sudo zfs set com.sun:auto-snapshot=true mypool/lxd-pool/virtual-machines
```
------------
*Page contributed by [michabbs](https://github.com/michabbs)*
*Reference [Armbian Forum Dicussion](https://forum.armbian.com/topic/16559-tutorial-first-steps-with-helios64-zfs-install-config/)*