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
  bind 0.0.0.0
  port 24220

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

init_config:

instances:
# Every instance requires a `monitor_agent_url`
# Optional, set `plugin_ids` to monitor specific plugins
- monitor_agent_url: http://example.com:24220/api/plugins.json
plugin_ids:
- plg1
- plg2

1. Restart the agent

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

or

sudo systemctl restart sd-agent

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

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

or

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

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

fluentd
-----
  - 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/agent.py 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.

Screen_Shot_2018-01-18_at_11.46.12.png

Monitored metrics

MetricValues
fluentd.buffer_queue_length

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

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

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