- controller-image: 'centos7-java'
- openstack-image: 'centos7-devstack'
- mininet-image: 'ubuntu-trusty-mininet'
+ controller-image: 'centos7-java-builder-2c-4g'
+ openstack-image: 'centos7-devstack-2c-8g'
+ mininet-image: 'ubuntu-trusty-mininet-2c-2g'