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I had similar issues. Check the followings: how much vCPU, RAM, etc is defined in the flavor you chose (if you did not specify during the cluster-template-create then I think m1.small is the default), and make sure you have at least 1 compute node which has enough free resource for that.

Keep in mind that even if you chose to create only a single node cluster, magnum will actually create 2 VM (1 master and 1 'slave' node). So you have to have enough resource for both vm.