Information Technology Reference
In-Depth Information
Components of RHEV
The RHEV platform consists of the following components:
Red Hat Enterprise Virtualization Manager ( RHEV-M ): This is a centralized
management console with a graphical, web-based interface that manages your
complete virtualization infrastructure, such as hosts, storage, network, virtual ma-
chines, and more, running on the physical hardware.
Red Hat Enterprise Virtualization Hypervisor ( RHEV-H ): RHEV hosts can be
either based on full Red Hat Enterprise Linux 6 systems with KVM enabled (also
called Red Hat Enterprise Linux Virtualization Hosts) or on purpose-built RHEV-
H hosts. RHEV-H is a bare metal, image-based, small-footprint (less than 200 MB)
hypervisor with minimized security footprint, also referred to as Red Hat Enter-
prise Virtualization Hypervisor.
What is the difference between these two? RHEV-H is like a live image that does
not allow third-party applications, whereas the RHEL host is an operating system
with KVM modules that allows any third-party software.
Virtual Desktop and Server Management Daemon ( VDSM ): This runs as the
VDSM service on the RHEV hypervisor host that facilitates the communication
between RHEV-M and the hypervisor host. It uses the libvirt ( http://libvirt.org/ )
and QEMU service for the management and monitoring of virtual machines and
other resources such as hosts, networking, storage, and so on.
Storage domains : This is used to store virtual machine images, snapshots, tem-
plates, and ISO disk images in order to spin up virtual machines.
Logical networking : This defines virtual networking for guest data, storage ac-
cess, and management and displays network that accesses the virtual machine con-
soles.
Database platform : This is used to store information about the state of virtualiza-
tion environment.
SPICE : This is an open remote computing protocol that provides client access to
remote virtual machine display and devices (keyboard, mouse, and audio). VNC
can also be used to get remote console access.
Authentication : This provides integration with external directory services such as
Red Hat IPA and Active Directory Services for user authentication.
API support : RHEV v3.3 and higher supports the REST API, Python SDK, and
Java Software Development Kit, which allow users to perform complete automa-
tion of managing virtualization infrastructure outside of a standard web interface of
manager using own programs or custom scripts. Users can also use command-line
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