Information Technology Reference
In-Depth Information
Once this process is complete, the guest domain has the same system identity
and applications as it did on the original physical server. The amount of time to
complete the process depends on the size of the file systems being copied and
the network bandwidth available for its transmission to the control domain. The
amount of administrator effort is dramatically reduced, with only a few commands
needed to carry out a complete system migration.
The preceding examples manage Logical Domains with a command-line interface.
This strategy is traditional and scriptable—but also requires prerequisite skills,
can be error-prone, and is intimidating for the occasional user. It also does not
scale well when many machines are involved.
These limitations can be addressed by using scripts and by making appropri-
ate use of standards and automation in an enterprise. They are also addressed
by the Logical Domains Configuration Assistant, which provides a graphical user
interface (GUI) for the initial installation and configuration of Logical Domains
software and guest domains on a server. The Configuration Assistant is a Java
application that is provided with the Logical Domains install software. To start it,
issue the following command:
$
java -jar
/path/
Configurator.jar
This command launches a GUI that steps the user through a set of panels, such as
the one shown in Figure 3.4.
The GUI steps through a series of panels that let the user specify the number
of domains to be created and the paths to their virtual disks. The last step lets
the user save a script to run at a later time on one or more servers or, if the ap-
propriate host name and password are provided, to run on a target CMT server.
The Logical Domains package also includes the
ldmconfig
command, a text-mode
tool that prompts the administrator for information about the domains and then
generates the commands to build those domains according to best-practice nam-
ing conventions and a template of where the virtual disk back-ends are stored.
A more comprehensive solution is based on the Oracle Enterprise Manager
Ops Center licensed product, described at
http://www.sun.com/software/
products/opscenter/
.
This product provides full life-cycle support for provi-
sioning, and managing systems in a data center from a single user interface and
screen, for both real and virtual systems. Ops Center can create, delete, configure,
boot, and shut down Logical Domains. It also provides monitoring and manage-
ment, showing utilization charts for CPU, memory, and file systems. In addi-
tion, the Ops Center manages resource pools, permitting dynamic reallocation
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