Nodejs

The '' library is used to post records from Node.js applications to Fluentd.

This article explains how to use the fluent-logger-node library.

Prerequisites

Basic knowledge of Node.js and NPM
Basic knowledge of Fluentd
Node.js 0.6 or higher

Installing Fluentd

Please refer to the following documents to install fluentd.

Modifying the Config File

Next, please configure Fluentd to use the forward Input plugin as its data source.

<source>
  @type forward
  port 24224
</source>
<match fluentd.test.**>
  @type stdout
</match>

Please restart your agent once these lines are in place.

# for rpm/deb only
$ sudo /etc/init.d/td-agent restart

Using fluent-logger-node

Obtaining the Most Recent Version

A Sample Application

package.json

{
  "name": "node-example",
  "version": "0.0.1",
  "dependencies": {
    "express": "^4.15.3",
    "fluent-logger": "^2.4.0"
  }
}

Now use npm to install your dependencies locally:

$ npm install

index.js

This is the simplest web app.

var express = require('express');
var logger = require('fluent-logger');
var app = express();

// The 2nd argument can be omitted. Here is a default value for options.
logger.configure('fluentd.test', {
  host: 'localhost',
  port: 24224,
  timeout: 3.0,
  reconnectInterval: 600000 // 10 minutes
});

app.get('/', function(request, response) {
  logger.emit('follow', {from: 'userA', to: 'userB'});
  response.send('Hello World!');
});
var port = process.env.PORT || 3000;
app.listen(port, function() {
  console.log("Listening on " + port);
});

Run the app and go to http://localhost:3000/ in your browser. This will send the logs to Fluentd.

$ node index.js

The logs should be output to /var/log/td-agent/td-agent.log or stdout of the Fluentd process via the stdout Output plugin.

Production Deployments

Output Plugins

Various output plugins are available for writing records to other destinations:

Examples
List of Plugin References
- Output to Another Fluentd
- Output to MongoDB or MongoDB ReplicaSet
- Output to Hadoop
- Output to File

High-Availability Configurations of Fluentd

For high-traffic websites (more than 5 application nodes), we recommend using a high availability configuration of td-agent. This will improve data transfer reliability and query performance.

Monitoring

Monitoring Fluentd itself is also important. The article below describes general monitoring methods for td-agent.

PreviousMonitoring by Rest Api NextPerformance Tuning Multi Process

Last updated 5 years ago

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