Plugin dns_slave_auto doesn't run/register for event

We have an ISPConfig single-server installation running for several years now and want to move to a small multi-server installation:

• Server 1 (Master): Control Panel with DNS1, Web, DB (both only for internal use) and Docker
• Server 2 (Slave): "Single Server" with DNS2, Web, DB, Mail

We don't want to use the mirror function for mirroring the DNS due to the fact, that everything is mirrored then.

We found the plugin dns_slave_auto which seems to do exactly what we want (get DNS1 and DNS2 in sync). But we can't get this plugin to work. It seems, that the plugin is never called after we added a DNS zone on the primary server (Server 1). The plugin should insert an entry in the table `dns_slave` but it never happens. There is also no entry in the datalog for this action.

ISPConfig Version: 3.2.9
Installed with autoinstaller

 

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Thank you, Till, for that hint. Now it works. I don't know how many times I created and deleted a test entry, add some log messages to the plugin etc.
Ok, lesson learned

Is it possible to add such hints to the README? I haven't found any information about "enabling" plugins - just: copy this to the folder.