How do I gracefully shutdown mongoose's connection pool?

Question

If I receive a SIGINT/SIGTERM (e.g. ctrl+c) then I must gracefully stop my app and close all connections to the mongodb server.

Most documentation/tutorials state that to stop a connection (or pool of connections), I must use mongoose.disconnect() - which calls .close() on connections in the pool.

However all those docs also say this should be done after all pending writes are completed.

How can I know this when I receive a signal event (e.g. SIGINT, SIGTERM, etc.)? Does mongoose have graceful shutdown functionality, or will I lose data when I call disconnect()?

(I'm using the latest bits.)

I know how to listen for signal events. What I don't know is how to ensure all writes are flushed. How to do so gracefully, if at all possible. — lonix

mat.mik mat.mik · Accepted Answer · 2019-02-03T12:56:54

To receive SIGINT signal and stop a connection you can use following code:

process.on('SIGINT', () => {
    mongoose.disconnect().then(() => {
        process.exit();
    });
});

How do I gracefully shutdown mongoose's connection pool?

1 Answers