This worked with all my containers, but not with the conainter with docker inside. After copy this container, the docker deamon don’t startup the container.
docker container ls
lists no containers.
When I copy it from srv1 to srv2 with a profile point to the default filesystem storage (ext4), all works fine.
Are there some additional task to do, to let docker work inside lxd with btrfs storage backend?
So in the case which didn’t work, were both servers using btrfs for storage?
If not, then your btrfs backed container would have been transferred over rsync, the data would have made it just fine to the target, but if docker in the container expects subvolumes to be present, it will be disappointed which would explain what you’re seeing.
ext4 to ext4 works because docker is likely running in aufs/overlay mode in that case and does not rely on btrfs subvolumes.
Not sure if I should have kicked this one, but I have the same with zfs backend on both servers. When I copy a LXD container with docker containers inside to one or the other LXD host, all docker images/containers are gone after transfer. So reading your comment I guess ZFS is also not suitable for it?