ONAP from the milky way point of view

From the very optimistic perspective ONAP is an independent system in the outer space that provides interfaces for User, Admin and OSS/BSS system in the North and xNF in the South and uses interfaces provided by NFVI and xNF.

ONAP deployed on kubernetes

ONAP has to be deployed on some infra. Currently it's kubernetes.

ONAP deployed on kubernetes with external databases

As most of applications ONAP requires some persistence layer in form of databases. As ONAP follows micro-service architecture principle in theory each component could ship its own database but in practice in commercial deployments its desired to configure ONAP to use external DB engines already existing in operators infrastructure.