This took a bit for me to figure out with Juno so I thought I’d share if you’re interested.
If you use devstack, this happens pretty naturally. I like to understand things a bit more fully and have been playing around with two old laptops running ubuntu 14.04 and openstack (one is a controller and compute/network, the other compute/network).
I only have one node running glance but both run swift. Obviously your swift should be up and running. Openstack’s Ubuntu guide does this pretty well. If you want to setup something a bit more fancy, you can also use the Ubuntu SecurityTeam TestingOpenStack guide (it’s a little dated but still good).
Once you have both swift and glance up, edit the /etc/glance/glance-api.conf
default_store = swift #I don’t think this is needed but doesn’t hurt
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