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2.4. Installing Guest Agents and Drivers

2.4.1. Red Hat Enterprise Virtualization Guest Agents and Drivers
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The Red Hat Enterprise Virtualization guest agents and drivers provide additional information and functionality for Red Hat Enterprise Linux and Windows virtual machines. Key features include the ability to monitor resource usage and gracefully shut down or reboot virtual machines from the User Portal and Administration Portal. Install the Red Hat Enterprise Virtualization guest agents and drivers on each virtual machine on which this functionality is to be available.
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Table 2.1. Red Hat Enterprise Virtualization Guest Drivers
Driver
Description
Works on
virtio-net
Paravirtualized network driver provides enhanced performance over emulated devices like rtl.
Server and Desktop.
virtio-block
Paravirtualized HDD driver offers increased I/O performance over emulated devices like IDE by optimizing the coordination and communication between the guest and the hypervisor. The driver complements the software implementation of the virtio-device used by the host to play the role of a hardware device.
Server and Desktop.
virtio-scsi
Paravirtualized iSCSI HDD driver offers similar functionality to the virtio-block device, with some additional enhancements. In particular, this driver supports adding hundreds of devices, and names devices using the standard SCSI device naming scheme.
Server and Desktop.
virtio-serial
Virtio-serial provides support for multiple serial ports. The improved performance is used for fast communication between the guest and the host that avoids network complications. This fast communication is required for the guest agents and for other features such as clipboard copy-paste between the guest and the host and logging.
Server and Desktop.
virtio-balloon
Virtio-balloon is used to control the amount of memory a guest actually accesses. It offers improved memory over-commitment. The balloon drivers are installed for future compatibility but not used by default in Red Hat Enterprise Virtualization 3.1 or higher.
Server and Desktop.
qxl
A paravirtualized display driver reduces CPU usage on the host and provides better performance through reduced network bandwidth on most workloads.
Server and Desktop.
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Table 2.2. Red Hat Enterprise Virtualization Guest Agents and Tools
Guest agent/tool
Description
Works on
rhevm-guest-agent-common
Allows the Red Hat Enterprise Virtualization Manager to receive guest internal events and information such as IP address and installed applications. Also allows the Manager to execute specific commands, such as shut down or reboot, on a guest.
On Red Hat Enterprise Linux 6 and higher guests, the rhevm-guest-agent-common installs tuned on your virtual machine and configures it to use an optimized, virtualized-guest profile.
Server and Desktop.
spice-agent
The SPICE agent supports multiple monitors and is responsible for client-mouse-mode support to provide a better user experience and improved responsiveness than the QEMU emulation. Cursor capture is not needed in client-mouse-mode. The SPICE agent reduces bandwidth usage when used over a wide area network by reducing the display level, including color depth, disabling wallpaper, font smoothing, and animation. The SPICE agent enables clipboard support allowing cut and paste operations for both text and images between client and guest, and automatic guest display setting according to client-side settings. On Windows guests, the SPICE agent consists of vdservice and vdagent.
Server and Desktop.
rhev-sso
An agent that enables users to automatically log in to their virtual machines based on the credentials used to access the Red Hat Enterprise Virtualization Manager.
Desktop.
rhev-usb
A component that contains drivers and services for Legacy USB support (version 3.0 and earlier) on guests. It is needed for accessing a USB device that is plugged into the client machine. RHEV-USB Client is needed on the client side.
Desktop.
The Red Hat Enterprise Virtualization guest agents and drivers are installed on Red Hat Enterprise Linux virtual machines using the rhevm-guest-agent package provided by the Red Hat Enterprise Virtualization Agent repository.

Procedure 2.6. Installing the Guest Agents and Drivers on Red Hat Enterprise Linux

  1. Log in to the Red Hat Enterprise Linux virtual machine.
  2. Enable the Red Hat Enterprise Virtualization Agent repository:
    • For Red Hat Enterprise Linux 6 
      # subscription-manager repos --enable=rhel-6-server-rhev-agent-rpms
      Copy to Clipboard Toggle word wrap
    • For Red Hat Enterprise Linux 7 
      # subscription-manager repos --enable=rhel-7-server-rh-common-rpms
      Copy to Clipboard Toggle word wrap
  3. Install the rhevm-guest-agent-common package and dependencies: 
    # yum install rhevm-guest-agent-common
    Copy to Clipboard Toggle word wrap
  4. Start and enable the service:
    • For Red Hat Enterprise Linux 6 
      # service ovirt-guest-agent start
# chkconfig ovirt-guest-agent on
      Copy to Clipboard Toggle word wrap
    • For Red Hat Enterprise Linux 7 
      # systemctl start ovirt-guest-agent.service
# systemctl enable ovirt-guest-agent.service
      Copy to Clipboard Toggle word wrap
  5. Start and enable the qemu-ga service:
    • For Red Hat Enterprise Linux 6 
      # service qemu-ga start
# chkconfig qemu-ga on
      Copy to Clipboard Toggle word wrap
    • For Red Hat Enterprise Linux 7 
      # systemctl start qemu-guest-agent.service
# systemctl enable qemu-guest-agent.service
      Copy to Clipboard Toggle word wrap
The guest agent now passes usage information to the Red Hat Enterprise Virtualization Manager. The Red Hat Enterprise Virtualization agent runs as a service called ovirt-guest-agent that you can configure via the ovirt-guest-agent.conf configuration file in the /etc/ directory.
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