toobusy

This plugin will stop Haraka accepting new connections when the event loop latency is too high.

See https://github.com/STRML/node-toobusy for details.

To use this plugin you must install the toobusy-js module — it is not bundled with Haraka. From your Haraka install directory:

npm install toobusy-js

This plugin registers on the connect hook with priority -100, so it runs ahead of other connect/lookup_rdns plugins. Listing it near the top of config/plugins is still a good idea for clarity.

Configuration

If you wish to override the default maxLag value of 70ms then add the desired value to config/toobusy.maxlag. This can be set and changed at runtime and no restart is required.

Note that if you set the maxLag value to <10 then this will cause the toobusy module to raise an exception which will cause Haraka to stop.