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3.6
S
NAPSHOTTING
Most commercial applications require complex combinations of filesystem and registry entries in
order to function properly. In order to facilitate virtualization of these applications, ZENworks
Application Virtualization can snapshot application installations and automatically configure them
based on modifications made to the host system during application setup.
3.6.1 Snapshotting
Snapshotting uses "before" and "after" images of the host machine to determine the virtual
application configuration:
•
"Before" snapshot: Taken prior to installing the application. This captures the state of the
host device without the target application installed.
•
"After" snapshot: Taken after installing the application. This captures all changes to the
host device during application installation. ZENworks Application Virtualization then
computes the changes, or deltas, between the before and after snapshots, and inserts these
changes into the configuration.
To use the snapshot feature:
•
Prepare the host device by either removing the target application and all dependencies, or
copying ZENworks Application Virtualization onto a "clean" machine.
•
Click on the Virtual Application tab on the ribbon bar and click Capture Before. This
captures the "before" snapshot image. Snapshotting iterates through the filesystem and
registry, and therefore may take several minutes to complete.
•
(Optional) Novell recommends you save the "before" snapshot before continuing. This
allows you to skip this step when snapshotting subsequent applications from the same
clean machine image. To save the snapshot, click on the down arrow underneath the
Capture Before button and select Save Snapshot. Note that while ZENworks
Application Virtualization automatically saves the most recent captured "before"
snapshot, this snapshot is reset once the Capture and Diff process is complete.
•
Install your application along with other files, settings, runtimes, and components you
wish to include in the virtual application (Refer to the following sub-section "Adding
runtimes and components" for more information on additional configuration). If the
application setup requests a reboot, be sure to save the "before" snapshot and then
proceed with the reboot.
•
On the Virtual Application tab on the ribbon bar, click Capture and Diff. This
captures the "after" snapshot, computes the deltas between the two snapshots, and
populates the virtual application with the delta entries.
•
(Optional) Review the filesystem and registry entries, and remove any files or settings
which are not required for proper execution of your virtual application. Removing unused
entries will reduce virtual application size, but be sure to avoid accidental removal of
required resources, as it will cause your virtual application to no longer function properly.
3.6.2 Saving snapshots
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Novell ZENworks Application Virtualization
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