node.js http server how to get connections count

Question

node.js http server how to get connections count

I'm using node as a http server with the following code:

http.createServer(function(req, res) {}).listen(8181);

I'm looking for a simple way to monitor a node js http server from within the same process. For me it would be enough to have a own function which just outputs the current resource usage and connection count as json. For now I don't need deep measuring or real time performance monitoring.

What are the key performance indicators for a node http server and is it possible to get them from node? If yes how? What you think of the folling kpi's:

Connection Count
CPU Usage
Ram Usage

Just need to know which variables/functions I need to get the data?

Thx I really appreciate your help

javascript
node.js

Answer 1

You need something like this:

var count = 0;

http.createServer(function(req, res) {
    count++;
    res.on('finish', function () {
        //setTimeout(function () {
        count--;
        //}, 60000);
    }).on('close', function () {
        count--;
    });
}).listen(8181);

With setTimeout() you can get the active connections in the last 1 minute.

see http://nodejs.org/api/os.html#os_os_cpus for CPU usage

see http://nodejs.org/api/process.html#process_process_memoryusage for memory usage