Good day, @simos proffered the information that clustering is up and coming in the thread “Start container from container dir” - - - so I followed the link to read (and hopefully understand!).
Under the heading - - ‘Interactively’ is the following:
“You can now join further nodes to the cluster. Note however that these nodes should be brand new LXD instances, or alternatively you should clear them up before joining, since any existing data on them will be lost.”
Hopefully questions are not overly premature!
Reading the above it seems to me that I cannot set up a cluster from existing containers.
(Logic flow here: if I could create clusters from pre-existing containers then I could have a group of containers who either can be grouped into, or not, a cluster. This (my thinking at least) would promote having a cluster of x containers which together might form a LAPP server but if I wanted to add another container that had a functioning Nginx server that I could transform that cluster into a higher volume handler. Further I could have a couple different ‘servers’ (grouped containers) setup and shift the add in Nginx server into or out of the clusters as demand required. Colvoluted, perhaps, but my projects here are steadily growing more complex and so I’m always exploring the fringes of ‘what’s possible’ - - rueful grin!)