Monitoring FluentD

This article will help you get the Fluentd plugin for sd-agent configured and returning metrics

Installing the fluentd plugin package

Install the fluentd plugin on Debian/Ubuntu:

sudo apt-get install sd-agent-fluentd

Install the fluentd plugin on RHEL/CentOS:

sudo yum install sd-agent-fluentd

Read more about agent plugins.

Configuring the agent to monitor Fluentd

1. Add a monitor_agent source to fluentd configuration

  @type monitor_agent
  port 24220

2. Configure /etc/sd-agent/conf.d/fluentd.yaml


# Every instance requires a `monitor_agent_url`
# Optional, set `plugin_ids` to monitor specific plugins
- monitor_agent_url:
- plg1
- plg2

1. Restart the agent

sudo /etc/init.d/sd-agent restart


sudo systemctl restart sd-agent

Verifying the configuration
Execute info to verify the configuration with the following:

sudo /etc/init.d/sd-agent info 


/usr/share/python/sd-agent/ info

If the agent has been configured correctly you'll see an output such as:

  - instance #0 [OK]
  - Collected * metrics

You can also view the metrics returned with the following command:

sudo -u sd-agent /usr/share/python/sd-agent/ check fluentd

Configuring graphs

Click the name of your server from the Devices list in your Server Density account then go to the Metrics tab. Click the + Graph button on the right then choose the fluentd metrics to display the graphs. The metrics will also be available to select when building dashboard graphs.


Monitored metrics

Metric Values

The length of the buffer queue for this plugin.
buffer / None
Type: float

The size of the buffer queue for this plugin.
byte / None
Type: float

The number of retries for this plugin.
time / None
Type: float
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