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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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clusvcadm(8)						       Red Hat Cluster Suite						      clusvcadm(8)

NAME
clusvcadm - Cluster User Service Administration Utility SYNOPSIS
clusvcadm [-d <service> ] [-e <service> ] [-l] [-u] [-S] [-m <member> ] [-r <service> ] [-R <service> ] [-M <service> ] [-Z <service> ] [-U <service> ] [-s <service> ] [-v] DESCRIPTION
The clusvcadm command allows an administrator to enable, disable, relocate, and restart user services in a cluster. In order to perform cluster service operations, the cluster daemons must be running (and have quorum) on the member system on which the command is invoked. OPTIONS
-d <service> Stops and disables the user service named service -e <service> Enables and starts the user service named service -l Lock services in preparation for cluster shutdown. This should only be used if the administrator intends to perform a global, clus- ter wide shutdown. This prevents services from starting (but not stopping, like -Z does). Once the cluster quorum is dissolved, this state is reset. If a new instance of rgmanager boots while others are locked, the behavior is undefined. -u Unlock resource group managers. This allows services to start again. -S Display whether the resource group managers are locked or not. This can be used to verify the correct operation of the -l and -u options, but is only useful for debugging. -m <member> When used in conjunction with either the -e or -r options, this specifies the preferred target member on which to start the service. -r <service> Relocates the user service named service to another cluster member. -R <service> Restarts the user service named service on the cluster member on which it is currently running. -M <service> Use a special "migration" operation to move the user service named service to another cluster member. Currently, this is only use- ful for virtual machines. Use of migration usually requires special configuration of the local virtual machine manager in order to work correctly. -Z <service> Freezes the service named service on the cluster member on which it is currently running. This will prevent status checks of the service as well as failover in the event the node fails or rgmanager is stopped. -U <service> Unfreezes the user service named service on the cluster member on which it is currently running. This will re-enable status checks. -s <service> Stops the service named service until a member transition or until it is enabled again. -v Display version information and exit. NOTES
Executing -U (unfreeze) on a service which was frozen in the started state while the service owner is offline results in an undefined (and possibly dangerous) condition. Manually ensure all resources are clear before doing this. SEE ALSO
clustat(8) Jan 2005 clusvcadm(8)
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