the clustering and enterprise plugins are no longer supported by igniterealtime. they are not available for download, and will not run in the current release of openfire.
The enterprise plugin is no longer supported. Licenses can no longer be purchased for use with the old plugin. This applies to all versions of the server and the plugin.
there are a couple of threads of interest for you then
some ideas but nothing concrete. I haven’t had a chance myself to try this because my position has changed slightly, and to be honest we don’t need clustering for openfire, so it wasn’t high up on my list.
My company has been running openfire 3.6.3 in a cluster for a while, we upgraded to 3.6.3 about a month ago.
We have developed a clustering plugin for openfire. We are trying to make it available as a commercial product, but have not received a response from igniterealtime. Maybe not very helpful, but with any luck there might be some news soon.