Comment 4 for bug 1664721

A couple of other things of note:
 - If you don't specify an endpoint (i.e. you ue the Unix socket), Juju will extract the HTTPS port from the server's configuration, rather than assuming 8443.
 - If you don't specify an endpoint, Juju will not set the core.https_address config if it's already set.

So to use a secondary LXD, you should:
 1. set core.https_address first, to something other than <IP>:8443.
 2. set $LXD_DIR when you bootstrap