[lxc-users] ZFS configuration

[Mike Wright]

On 08/21/2018 11:40 AM, Stephen Brown Jr wrote:
> Hello,
>      I am just getting started with LXD. I have an existing zfs pool, 
> and want to use a ZFS dataset on that pool to store my containers on.
> 
> I ran the command lxc storage create pool1 zfs source=fast/containers, 
> and it appeared to create it, however, I do not see it in the /fast 
> directory nor does zpool status list this.
> 
> It's possible that I don't understand how this works however. I do see 
> it created if I run the command lxc storage list, it does indeed show up:
> 
> | pool1   |             | zfs    | fast/containers                    | 0
> 
> I created a container for testing thinking it would show up, but no go 
> on that either.
> 
> Would like to understand how this is implemented and what I should expect?

Hi,

I'm also new to zfs and lxd so my help is limited.

Did you mount your zfs dataset anywhere? My ubuntu system is like

/var
   /lib
     /lxd
       /containers
         ...
       /storage-pools
         /lxd        <-- my lxc pool name; zfs dataset name; mountpoint
           /containers
             ...
           /snapshots

For this to work you *must* mount your dataset before you create any 
containers.  If you already have containers you won't be able to mount 
over the top of them.  zfs wants an empty mountpoint AFAIK

I mounted one level above /containers so I could get all the images, 
snapshots, deleted, and containers, etc in one place and allow for 
moving them as a "set".

Note that /lxd was put there by the lxc storage command. Your pool1 is 
probably there, too.