One of the virtues of running instances in a virtualized environment is that it opens up new opportunities for security controls that are not typically available when deploying onto bare metal. There are several technologies that can be applied to the virtualization stack that bring improved information assurance for cloud tenants.
Deployers or users of OpenStack with strong security requirements may want to consider deploying these technologies. Not all are applicable in every situation. In some cases, technologies may be ruled out for use in a cloud because of prescriptive business requirements. Similarly some technologies inspect instance data such as run state which may be undesirable to the users of the system.
In this chapter we explore these technologies and describe the situations where they can be used to enhance security for instances or underlying instances. We also seek to highlight where privacy concerns may exist. These include data pass through, introspection, or providing a source of entropy. In this section we highlight the following additional security services: