how to create services in cluster on redha 5 clustering??

prince amir · 09-25-2007, 07:06 AM

Hello all
i need help with a problem that i have with redhat 5 that runing on 2 computers , cluster suite.
i have on both computers , 2 software that are the same
i want to run the cluster and create a service for both computers when one software is stuck or has a problem, the other computer run the script and start the same program
i cant find any documents how to create service and resoucre configuration over CONGA (CLUSTER SUITE )

if some one have any samples for doc i be happy

thanks

Amir

brianmcgee · 09-25-2007, 08:05 AM

I would recommend that you modify the cluster.conf manually.

You have to add a ressource script for your application. For example you could use the /etc/init.d scripts for that. However the return value is expected to be zero.

As an example I have added a simple configuration for httpd:

Code:

<?xml version="1.0"?>
<cluster config_version="8" name="atixcluster">
        <cman expected_votes="1" two_node="1"/>
        <fence_daemon clean_start="1" post_fail_delay="0" post_join_delay="3"/>
        <clusternodes>
                <clusternode name="host1" votes="1" nodeid="1">
			<fence>
                                <method name="1">
                                        <device name="fence_manual" nodename="host1"/>
                                </method>
                        </fence>
                </clusternode>
        <clusternode name="host2" votes="1" nodeid="2">
		
                        <fence>
                                <method name="1">
                                        <device name="fence_manual" nodename="host2"/>
                                </method>
                        </fence>
                </clusternode>
        </clusternodes>
        <fencedevices>
                <fencedevice agent="fence_manual" name="fence_manual"/>
        </fencedevices>
	<rm>
                <failoverdomains>
                        <failoverdomain name="ALL" ordered="0" restricted="1">
                                <failoverdomainnode name="host1" 
					priority="1"/>
                                <failoverdomainnode name="host2" 
					priority="1"/>
                        	</failoverdomain>
                </failoverdomains>
                <resources>
                        <ip address="10.16.40.150" monitor_link="yes"/>
                        <script file="/etc/init.d/httpd" name="apache"/>
                </resources>
                <service name="web" autostart="1" domain="ALL">
                        <ip ref="10.16.40.150"/>
                        <script ref="apache"/>
                </service>
        </rm>
</cluster>

prince amir · 09-25-2007, 11:15 AM

is there another tool that i can use to edit the conf file
im pretty new in this matter and i need help in this subject

brianmcgee · 09-26-2007, 12:52 AM

There is also the cluster administration gui system-config-cluster. As this tool is used in earlier Red Hat releases it is more reliable than the new browser based configuration tools. However you will learn much more if you take the time to study the cluster.conf manually. There is always the chance, that system-config-clusters does not recognize your old settings...