Node.js high-level servers' communication API

folks. I wander whether there is any high-level API for servers' communication in Node.js framework? For example, I have several开发者_JAVA百科 servers, where my application runs and I want to control loading of this servers. Sometimes, if some server is overloaded I want to redirect some connection requests to another(more free one). Are there any functions which could help me? Or I have to implement my own functionality?

Try looking at cluster. This allows you to control multiple node proccess and scale nicely.

Alternatively just set up TCP sockets and pass messages around over TCP or pass messages around over a database like redis.

You should be able to pipe HTTP connection down streams. You have one HTTP server as a load balancer and this server just passes messages on to your other servers and passes them back.

You're looking for what's called a load balancer. There are many off-the-shelf solutions, nginx being one of the standards today (and VERY quick/easy to set up).

I don't know of a node-native solution, but it's not that hard to write one. In general, however, load balancers don't actually monitor server load, they monitor whether a server is live or not and distribute traffic relatively equally.

As for your communications question, no -- there's no standardized API to communicate to/from node.js servers. Again, however, not hard to set up -- Assuming you're already hosting HTTP (using express, or native), just listen for specific requests, perhaps to /comm/ or whatever you deem appropriate and pass JSON back-and-forth.

Not too sure for Nodejs but I've heard ppl using Capistrano with Nodejs