Apparently, one of the most pertinent questions that pops up when designing an OpenStack environment is the network setup and configuration. Networking in OpenStack might appear complex when we consider using Neutron instead of the Nova-network service. Without going into too much depth by distinguishing the difference between both network services in OpenStack, it might be crucial to identify how Sahara can handle the network operation in a Hadoop cluster using either Nova-network or neutron. By default, Sahara uses nova-network. However, we have configured in our RDO installation to use Neutron. This can be verified in the /etc/sahara/sahara-api.conf
configuration file in the cloud controller:
… use_neutron=True …
Most importantly, Sahara requires SSH access to the instances of the Hadoop cluster once successfully spawned. To do so, Sahara will use either their fixed or floating IP.
By default, Sahara uses floating IP. This can be verified in the Sahara configuration...