DHCP Forwarder Application

Table Of Contents

DHCP Forwarder Application

Installing the DHCP Forwarder

Uninstalling the DHCP Forwarder

DHCP Forwarder VCS Agent

Adding a DHCP Forwarder Resource

Removing a DHCP Forwarder Resource

DHCP Forwarder Application

This module describes how to install the DHCP forwarder application as well as adding and removing resources.

Note This module is only relevant when the DHCP Lease Query LEG is installed on the SM server.

The DHCP Forwarder application acts as a bridge between the DHCP Lease Query LEG and the DHCP servers. The LEG sends a request to the DHCP Forwarder, which then forwards the request to the appropriate DHCP server. The DHCP Forwarder passes the replies from the DHCP servers to the LEG. The LEG signals the forwarder which server should receive each request. Therefore, no special configuration is needed for this application.

Because only root privileged applications can open ports under 1024 (DHCP uses ports 67 and 68), the DHCP Forwarder runs with root privileges.

• Installing the DHCP Forwarder

• Uninstalling the DHCP Forwarder

• DHCP Forwarder VCS Agent

Installing the DHCP Forwarder

Step 1 Run the DHCP Forwarder installation script from the SM DIST root directory.

You must run the DHCP Forwarder installation script as root.

#./install-forwarder.sh
The installation script extracts the DHCP Forwarder distribution to the sm-inst-dir \sm\server\addons\dhcp-forwarder directory ( sm-inst-dir refers to the SM installation directory). The script adds the initialization scripts to their location according to the machine's OS.

Step 2 Run the DHCP Forwarder application.

The DHCP Forwarder application can be run using one of the following methods:

•Restart the machine. The initialization script will start the application automatically.

•Run the following command as root :

•#/etc/init.d/p3dhcpforwarder start

Note It is not possible to run the script if the /etc/motd file exists. The file should be moved or removed prior to running the install-forwarder.sh script.

Uninstalling the DHCP Forwarder

Step 1 Stop the DHCP Forwarder application.

Run the following command as root to stop the application.

#/etc/init.d/p3dhcpforwarder stop
Step 2 Remove the DHCP Forwarder application startup and shutdown scripts.

Run the following command as root to remove the startup and shutdown scripts.

•For Solaris:

•# rm /etc/rc*.d/[SK]*p3dhcpforwarder /etc/init.d/p3dhcpforwarder

•For Red Hat:

•# rm /etc/rc.d/rc*.d/[SK]*p3dhcpforwarder /etc/rc.d/init.d/ p3dhcpforwarder

Step 3 Remove the DHCP Forwarder application directory.

Run the following command to remove the application.

# rm -r ~pcube/sm/server/addons/dhcp-forwarder

DHCP Forwarder VCS Agent

To verify that the DHCP Forwarder process is active at all times, a Veritas Cluster Server (VCS) Agent of type OnOnlyProcess is added as a resource.

• Adding a DHCP Forwarder Resource

• Removing a DHCP Forwarder Resource

Adding a DHCP Forwarder Resource

Step 1 Import the OnOnlyProcess agent's type from the /opt/VRTSvcs/bin/OnOnlyProcess/OnOnlyProcess.cf file.

Step 2 Add an OnOnlyProcess resource called DHCP_Forwarder to the service group.

Step 3 Note the path and arguments of the DHCP Forwarder.

Run the following command via a Telnet session on each of the servers:

>ps -ea -o pid,s,args
Look for the line containing the text "DHCP_FORWARDER". This line contains the path and arguments of the DHCP Forwarder to be used in the next step.

Step 4 Define the OnlineCmd, PathName, and Argumentsparameters.

Define the parameters as follows:

•OnlineCmd—Type the DHCP Forwarder start command:

•/etc/init.d/p3dhcpforwarder start

•PathName—Type the DHCP Forwarder process path (from the previous step). For example: /opt/pcube/j2re1.4.2_05/bin/java

•Arguments—Type the DHCP Forwarder process arguments (from the previous step). For example: DAPP=DHCP_FORWARDER -jar /opt/pcube/sm/server.

For further information about the parameters, see the following figure.

Figure 6-1 Adding a DHCP Forwarder Resource

Note The arguments line might seem shorter than the actual full argument list. This is perfectly acceptable.

Removing a DHCP Forwarder Resource

Step 1 Right-click on the DHCP Forwarder Resource icon and choose Deletefrom the drop-down menu.

Figure 6-2 Removing a DHCP Forwarder Resource