juju enable-ha with lxd servers

[Daniel Bidwell]

I have 3 lxd servers, lxd0,lxd1, and lxd2.  I did a "juju bootstrap lxd
lxd-prod" on lxd0.  Now I would like to enable juju high availability
with machines lxd1 and lxd2 as secondary juju controllers.  I see that
I want something like "juju enable-ha -n 3 -server lxd1 lxd2".  What
form do I need lxd1 and lxd2 in to do this?

I tried doing "juju add-machine ssh:root at lxd1"
-- 
Daniel Bidwell <drbidwell at gmail.com>