Specifications

GUI Server
its configuration data. Since the LifeKeeper GUI is a client/server application, a user will run the
graphical user interface on a client system in order to monitor or administer a server system where
LifeKeeper is executing. The client and the server may or may not be the same system. The
LifeKeeper GUI allows users working on any machine to administer, operate, or monitor servers and
resources in any cluster, as long as they have the required group memberships on the cluster
machines. [For details, see Configuring GUI Users.] The LifeKeeper GUI Server and Client
components are described below.
GUI Server
The LifeKeeper GUI server is initialized on each server in a LifeKeeper cluster at system startup. It
communicates with the LifeKeeper core software via the Java Native Interface (JNI), and with the
LifeKeeper GUI client using Remote Method Invocation (RMI).
GUI Client
The LifeKeeper GUI client is designed to run either as an application on a Linux system, or as an
applet which can be invoked from a web browser on either a Windows or Unix system.
The LifeKeeper GUI client includes the following graphical components:
l Thestatus tableon the upper left displays the high level status of connected servers and their
resources.
l Theproperties panelon the upper right displays detailed information about the most recently
selected status table object.
l Theoutput panelon the bottom displays command output.
l The message bar at the very bottom of the window displays processing status messages.
l Theserver context and resource context toolbars (in the properties panel) and global toolbar
provide fast access to frequently-used tasks.
l The server context and resource context menus (popup) and global menus (file, edit server,
edit resource, view, and help) provide access to all tasks.
Right-clicking on a graphic resource, server, or table cell will display a context menu. Most tasks can
also be initiated from these context menus, in which case the resources and servers will be
automatically determined.
Starting GUI clients
Starting the LifeKeeper GUI Applet
To run the LifeKeeper GUI applet via the web open your favorite web browser and go to the URL
http://<server name>:81 where <server name> is the name of a LifeKeeper server. This will load the
LifeKeeper GUI appletfrom the LifeKeeper GUI server on that machine.
After it has finished loading, you should see theCluster Connect dialog, which allows you to connect
to any GUI server.
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