Chapter 9. Configuring and using the Red Hat Cluster Manager GUI
Red Hat Cluster Manager includes a graphical user interface (GUI) which allows an administrator to graphically monitor cluster status. The GUI does not allow configuration changes or management of the cluster, however.
Setting up the JRE
The Red Hat Cluster Manager GUI can be run directly on a cluster member, or from a non-cluster member to facilitate remote web based monitoring. The GUI itself is implemented as a java applet that runs in a Web browser. For this reason, it is required that all systems on which the GUI is intended to be run must have the Java Runtime Environment (JRE) installed and configured as a browser plug-in. The cluster manager GUI can be run using either the IBM JRE or the Sun JRE.
 | Warning |
|---|---|
The IBM JRE is included and installed by default on Red Hat Enterprise Linux AS. The installation and use of the Sun JRE with Red Hat Enterprise Linux AS is not supported. The information in the Section called Setting up the Sun JRE is provided only as a convenience to users who wish to deploy it. |
Setting up the IBM JRE
The IBM JRE is automatically installed on the cluster members in the IBMJava2-JRE-1.3.<version> RPM package (where <version> is the version of the IBM JRE currently available). This package places the JRE in /opt/IBMJava2-13/.
The RPM installation of the JRE will automatically setup the required plugin link as required by the Mozilla Web browser.
To enable the IBM JRE for usage with the Netscape Navigator version 4.x, follow the instructions supplied with the JRE. For example, as specified in /opt/IBMJava2-131/docs/README-EN.JRE.HTML of IBM JRE v.1.3.1-3,the instructions specifiy the following commands:
cd /usr/lib/netscape/plugins ln -s /opt/IBMJava2-131/jre/bin/javaplugin.so |
Setting up the Sun JRE
If the cluster GUI is to be installed on a non-cluster member, it may be necessary to download and install the JRE. The JRE can be obtained from Sun's java.sun.com site. For example, at the time of publication, the specific page is http://java.sun.com/j2se/1.3/jre/download-linux.html
After downloading the JRE, run the downloaded program (for example, j2re-1_3_1_02-linux-i386-rpm.bin) and confirm the license agreement. This results in the extraction of the JRE's RPM, jre-1.3.1_02.i386.rpm, which is installed using rpm.
After installing the JRE, enable the browser that is intended to run the GUI applet with Java support. The procedure needed to enable java support is dependent on the specific browser and browser version used. Refer to the installation instructions for java plugins found on the JRE download page.
For example, to enable java for usage with release 4 of Netscape Navigator/Communicator, add the following in the ~/.bash_profile file:
export NPX_PLUGIN_PATH=/usr/java/jre1.3.1_02/plugin/i386/ns4:/usr/lib/netscape/plugins |
The specific directory path may vary. Also, note that the JRE's installation instructions are different for release 6 of Netscape Communicator.
The following example describes the setup step necessary to configure the Mozilla browser to enable the java plugin:
ln -s /usr/java/jre1.3.1_02/plugin/i386/ns600/libjavaplugin_oji.so \ /usr/lib/mozilla/plugins/ |