Fluentd
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The fluent-logger-ruby library is used to post records from Ruby applications to Fluentd.
This article explains how to use it.

Prerequisites

  • Basic knowledge of Ruby
  • Basic knowledge of Fluentd
  • Ruby 2.1 or later

Installing Fluentd

Please refer to the following documents to install fluentd:

Modifying the Config File

Configure Fluentd to use the forward input plugin as its data source:
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<source>
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@type forward
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port 24224
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</source>
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<match fluentd.test.**>
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@type stdout
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</match>
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Restart agent after configuring.
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# for rpm/deb only
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$ sudo /etc/init.d/td-agent restart
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# or systemd
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$ sudo systemctl restart td-agent.service
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Using fluent-logger-ruby

Add 'fluent-logger' gem to your Gemfile:
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gem 'fluent-logger', "~> 0.7.1"
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Initialize and post the records as shown below:
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require 'fluent-logger'
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Fluent::Logger::FluentLogger.open(nil, :host=>'localhost', :port=>24224)
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Fluent::Logger.post("fluentd.test.follow", {"from"=>"userA", "to"=>"userB"})
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Executing the script will send the logs to Fluentd:
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$ ruby test.rb
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The logs should be output to /var/log/td-agent/td-agent.log or the standard output of the Fluentd process via the stdout output plugin.

Production Deployments

Output Plugins

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

High-Availability Configurations of Fluentd

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

Monitoring

Monitoring Fluentd itself is also important. The article below describes the general monitoring methods for td-agent.
If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is an open-source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.
Last modified 7mo ago