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Re: [Linux-cluster] Higher Grained Definition of IP AddressAssignments?



/usr/share/cluster/ip.sh appears to perform the link-monitoring in the "status" command, which is called periodically.  I don't know that either rgmanager or cman or other cluster software are directly involved in that.


The "ip" configuration already supports an "interface" attribute:


      <ip address="" interface="eth0" monitor_link="1"/>






From: linux-cluster-bounces redhat com [mailto:linux-cluster-bounces redhat com] On Behalf Of Dustin Henry Offutt
Sent: 14 June 2010 13:15
To: linux-cluster redhat com >> linux clustering
Subject: Re: [Linux-cluster] Higher Grained Definition of IP AddressAssignments?


Appreciate the info, but indeed what we need is HA.

I need to perhaps request if a cluster developer would be willing to add a new configuration item to the IP xtag within the cluster.conf configuration that would allow one to specify IP an IP label to apply the IP resource to.

This could be done via a cluster resource script - but then we'd lose the ability to have the cluster software monitor the link and relocate the service should the link be lost.

Kit Gerrits wrote:



What you want sounds more like Load Balancing than HA Clustering.


I would suggest building a lvs load balancing cluster with 10.1.1.x as front-end IP and 10.1.2 as backend IP.

Make the LVS the default gateway for your 'cluster servers' (realservers), then configure 1-.1.1.50 on your LVS cluster as Virtual IP with the 10.1.2.x realservers as backend using NAT routing.


Documentation isa vailable at:


or, more specifically:



LVS should be included in Red Hat Advanced Platform.


Yes, running a LoadBalancing cluster means 2 more servers and 2 more subscriptions, but it will allow for highly-available Load Balancing.

(implicitly allowing you to take realservers offline for maintenance)





Kit Gerrits


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