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configuration consistence across the nodes

Created: 20 Feb 2011 • Updated: 17 Mar 2011 | 2 comments
Antony Pavlenko's picture
3 Agree
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Status: On Roadmap

In my practice most DR/HA solutions failed because of node's inconsistent configuration.
Everybody knows that application and server management before clustering and after really differs.
After clustering both application and server management should be correlated with the Cluster.
When you do something at one node, you also should do the same thing at the whole nodes of this cluster. For example when you add user to one node, you should add the same user at all other cluster nodes. Likewise, you should act with groups, projects, sudo or RBAC rules, and so on.
I think one of the very popular misconfiguration are users crontabs. Application admins often use crontab to run really critical tasks. Of cause than they edit cron, they don't do it at all cluster nodes. And one day, when this node fail, and application starts at another one node "strange" problems came until anybody recall about cron.
Nowadays I couldn't find any solution on the market, which can help and I'm not sure that such solution in general can be.
May be Disaster Recovery Advisor ( RecoverGuard) should do this, but doesn't.
Any way I think it will be great if VCS can help here.
I have wrote an agent, which checks any file, you specify to be consistent across all the nodes. But it can just notify if file is changed at one of the nodes.
Also I'm not sure that Agent is really the best solution here. May be it will be better to "lock" file, controlled by VCS. And if anybody would like to edit this file, he will unlock it and after editing "say" to VCS that this file must be changed at all VCS nodes and VCS will sync this file across all nodes.
May be there is any other much more useful solution.
But I'm pretty sure that if VCS will have such feature there will be much less failures.

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Ranga Rajagopalan's picture

Veritas Operations Manager (VOM) provides a set of canned Health Checks that can be used to detect possible issues with failover (same as VCS HA FireDrill). In next release, VOM will support the ability for user defined health checks - these checks can be scheduled to be run as required and can be used for providing checks such as the one outlined above. The checks can be run specific to a cluster or across the data center.

We will also see if a signature to help with above check can be added to DRA.

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CMilani's picture

In addition, we have a beta add-on available for Veritas Operations Manager (VOM) called package anomaly that compares a set of servers against a set of packages in an attempt to find systems that are non-standard or have installations different than other similar or related systems in the datacenter. The results are displayed on a graphical report that facilitates spotting anomalies.

This Veritas Operations Manager (VOM) add-on is available at:

http://www.symantec.com/business/products/components.jsp?pcid=pcat_storage&pvid=operations_manager_1

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