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Do all nodes have to be compute nodes in order to launch on them


Maybe a stupid question, but is not clear from the docs and I couldn't find the answer anywhere.

Do all servers, that I want to run something on have to be compute nodes?

For example, let's say that I have 16 servers and I put 3 controller nodes and 1 compute node on four of them. Will I then be able to spawn VMs on some of the other 12 servers with Openstack or do all 12 of them have to be provisioned as compute nodes in order to be used like that?