An Instance provides capacity for running Processes
$ convox rack instances
ID STATUS STARTED PS CPU MEM PUBLIC PRIVATE
ip-10-1-1-1.ec2.internal running 10 minutes ago 8 0.00% 0.00% 18.200.200.99 10.1.1.1
ip-10-1-2-2.ec2.internal running 10 minutes ago 6 0.00% 0.00% 3.80.240.200 10.1.2.2
ip-10-1-3-3.ec2.internal running 10 minutes ago 8 0.00% 0.00% 3.90.90.200 10.1.3.3
