Infrastructure as a Service (IaaS) is a cloud services model that provides storage, networking, compute, and other IT resources to a user on-demand through the Internet. In the IaaS model, the burden of system maintenance, update, and backup is outsourced to the service provider, while the users have continuous on-line access to the required systems and applications.
The OpenStack Identity service, or Keystone, is an authentication service for the OpenStack cloud operating system that easily integrates with third-party directory services, such as Lightweight Directory Access Protocol (LDAP). Using the OpenStack Identity services, a cloud administrator can create user accounts and configure permissions to access common resources, as well as create and manage access policies for them.
The OpenStack Image service, or Glance, provides a RESTful API that enables you to manage your virtual machine images and metadata. Glance requires storage for images. In some environments using local file storage for virtual machine images is beneficial. However, in many production environments, Swift or Ceph is a better choice as a storage back end for Glance.
InfluxDB is a time series database specifically optimized to process large volumes of time series data, such as monitoring and metrics.
The iSCSI extensions for Remote Direct Memory Access (RDMA) are an extension to the iSCSI network protocol that enables it to use the advantages of the RDMA protocol suite to supply higher bandwidth for block storage transfers (zero time copy behavior). To that fact, it eliminates the TCP/IP processing overhead while preserving the compatibility with iSCSI protocol.