With multiple containers, how does Galaxy shared Mongo DB work?

I’ve just enabled three containers (for high availability) on Galaxy. Does this share a single default DB with all three containers?

Yes, all three containers share the same MongoDB database using the connection string configured in your app settings (MONGO_URL).

The high availability setup replicates your web application across 3 containers for redundancy and load balancing. Your database connection remains the same single instance, whether that’s Galaxy MongoDB or an external database you’re using.