Perl

The 'Fluent::Logger' library is used to post records from Perl applications to Fluentd.

This article explains how to use the Fluent::Logger library.

Prerequisites

• Basic knowledge of Perl

• Basic knowledge of Fluentd

• Perl 5.10 or higher

Installing Fluentd

Please refer to the following documents to install fluentd.

• Install Fluentd with rpm Package

• Install Fluentd with deb Package

• Install Fluentd with Ruby Gem

• Install Fluentd from source

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

First, install the Fluent::Logger library via CPAN.

$ cpan
cpan[1]> install Fluent::Logger

Next, initialize and post the records as shown below.

# test.pl
use Fluent::Logger;
my $logger = Fluent::Logger->new(
    host => '127.0.0.1',
    port => 24224,
    tag_prefix => 'fluentd.test',
);
$logger->post("follow", { "entry1" => "value1", "entry2" => 2 });

Executing the script will send the logs to Fluentd.

$ perl test.pl

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

  • Store Apache Logs into Amazon S3

  • Store Apache Logs into MongoDB

  • Data Collection into HDFS

• List of Plugin References

  • Output to Another Fluentd

  • Output to MongoDB or MongoDB ReplicaSet

  • Output to Hadoop

  • Output to File

  • etc...

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.

• High-Availability Configurations of Fluentd

Monitoring

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

• Monitoring Fluentd

If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is a open source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.