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PostOnlineCommand and PreOfflineCommand

 

Specify these commands in the Parameters to a resource of type IBM WebSphere MQ MSCS. We can use them to integrate WebSphere MQ MSCS support with other systems or procedures. For example, you could specify the name of a program that sends a mail message, activates a pager, or generates some other form of alert to be captured by another monitoring system.

PostOnlineCommand is invoked when the resource changes from offline to online; PreOfflineCommand is invoked for a change from online to offline. When invoked these commands are run, by default, from \Windows\system32. Both commands run under the user account used to run the MSCS Cluster Service; and are invoked asynchronously; WebSphere MQ MSCS support does not wait for them to complete before continuing. This eliminates any risk that they might block or delay further cluster operations.

We can also use these commands to issue WebSphere MQ commands, for example to restart Requester channels However, the commands are run at the point in time when the queue manager's state changes so they are not intended to perform long-running functions and must not make assumptions about the current state of the queue manager; it is quite possible that, immediately after the queue manager was brought online, an administrator issued an offline command.

If you want to run programs that depend on the state of the queue manager, consider creating instances of the MSCS Generic Application resource type, placing them in the same MSCS group as the queue manager resource, and making them dependent on the queue manager resource.

 

Parent topic:

Hints and tips on using MSCS

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