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Full Discussion: cron sync
Operating Systems Solaris cron sync Post 302075225 by mhm4 on Wednesday 31st of May 2006 05:51:17 PM
Old 05-31-2006
Quote:
Originally Posted by izy100
I dun agree to use NFS export here.
Using cluster is to achieve high availability.
Use NFS for cronjob will cause the eliminate the usefulness of clustering.

The uptime of the application will only be as good as the NFS server itself.

If using NFS is a must, use a very very high uptime Enterprise NAS is an option.

Else you can use cluster filesystem that can be mounted on both system.

PS: Failing over cronjob has been a tricky problem for Open System like Solaris and Veritas Cluster. Unless the cluster is tightly integrated into the OS, e.g. Queue Manager in OpenVMS, this problem is very very hard to solve.
Frankly speaking, I dun have a good solution too.


I would encourage the application owner to design and write their application (cronjob) in a HA manner instead of depending on the OS cron to run their job (as it is on local HDD).

I agreed with Izzy. NFS is a bad solution. THis is a common problem with an easy fix. A cron on each node must be configured. You then add a wrapper to each cron script to check which node the particular service group is running on. Veritas provides a hostactive state that you can query to determine if the service group is active. And if so, execute the script else quit.
 

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LEARN ABOUT OPENSOLARIS

scversions

scversions(1M)						  System Administration Commands					    scversions(1M)

NAME

       scversions - Sun Cluster version management

SYNOPSIS

       scversions [-c]

DESCRIPTION

       Note -

	 Beginning  with  the Sun Cluster 3.2 release, Sun Cluster software includes an object-oriented command set. Although Sun Cluster software
	 still supports the original command set, Sun Cluster procedural documentation uses only the object-oriented command set. For more  infor-
	 mation about the object-oriented command set, see the Intro(1CL) man page.

       The  scversions	command  commits  the cluster to a new level of functionality after a rolling-upgrade to new Sun Cluster software. With no
       arguments, the scversions command prints a message indicating whether a commitment is needed.

OPERANDS

       The following operands are supported:

       -c	    Commit the set of nodes that are currently active members of the cluster to the highest possible level of functionality.

		    When you upgrade a node (either through upgrade to a new release of the product or by application of a patch) and boot it back
		    into  the  cluster, some of the internal protocols on that node might have to run at lower versions in order to cooperate cor-
		    rectly with other nodes in the cluster.  When the cluster is in this state, some administrative actions might be disabled  and
		    some new functionality introduced in the upgrade might be unavailable.

		    When  you  run  this  command once from any node after all nodes are upgraded, the cluster switches to the highest versions of
		    internal protocols possible. Assuming that all nodes have the same Sun Cluster software installed at that time, all new  func-
		    tionality becomes available and any administrative restrictions are removed.

		    If	a  node that has not been upgraded is an active member of the cluster at the time you run the -c option to scversions, the
		    command has no effect because the cluster is already running at the highest possible level of functionality.

		    If a node has not been upgraded and is not an active member of the cluster when you run the -c option to scversions (for exam-
		    ple,  if  that  node is down for maintenance), the internal protocols of the cluster are upgraded to the highest possible ver-
		    sions.  You might have to upgrade the node that was not an active member of the cluster to enable it to rejoin the cluster.

EXIT STATUS

       0	    Success

       non-zero     Failure

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsczu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       scinstall(1M)

Sun Cluster 3.2 						    17 Aug 2007 						    scversions(1M)
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