How do I deploy multiple stacks in an environment?
Yuu can explicitly name services in juju. So for for example instead of:
juju deploy haproxy
juju deploy mysql
you can just name them whatever you want:
juju deploy haproxy mynewproxy
juju deploy mysql dbserver2
or whatever fits your model. You just need to remember to add-relation based on name after that, so: juju add-relation mynewproxy dbserver2
It's awesome that you're using juju for this, if you want to give us some feedback on how it's working out for you please send a post to the juju mailing list.