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If you want to test openstack, Devstack is the better place to start with. DevStack would not even require two machine. Now, If you really want to install openstack, you have to decide what components you want to install. You can install all the components on one machine or you can install all the components on different machines, it \'s who has to make decision. If you install all the compnents on one machine then you might end up having very slow response time of the machine untill you are not using some huge servers. If i were you, i would go for three node installation. There are installation guides available, which explains, how you can set up openstack with two node or three node.