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1. Configure your VM with enough memory to run ONOS!
   1. ONOS java processes tend to consume a huge amount of memory. In order to run an ONOS cluster in a single VM, you should allocate a large amount of RAM to that VM. We recommend 2-4 GB (or more if you have it) for each ONOS node that you intend to run. You can see how much memory and CPU ONOS's java processes are using by running top - if you start using swap space, the performance of ONOS and Mininet will suffer greatly!
2. You may find it more convenient to install a GUI in your VM if you haven't already.
   1. In Ubuntu, you can use the default Ubuntu Unity desktop GUI or the lighter-weight LXDE.
3. For VirtualBox, you may wish to set up networking so that you can connect from your host machine into your VM
   1. Usually this means adding a host-only interface to the VM, and making sure it's configured
   2. Make sure that interface has an IP address (you can check with ifconfig or ip addr)

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