Docker metrics

The Docker input plugin lets you collect Docker container metrics, including memory usage and CPU consumption.

Configuration parameters

The plugin supports the following configuration parameters:

Key	Description	Default
exclude	A space-separated list of containers to exclude.	none
include	A space-separated list of containers to include.	none
interval_nsec	Polling interval in nanoseconds.	0
interval_sec	Polling interval in seconds.	1
path.containers	Container directory path, for custom Docker data-root configurations.	/var/lib/docker/containers
path.sysfs	Sysfs cgroup mount point.	/sys/fs/cgroup
threaded	Indicates whether to run this input in its own thread.	false

If you set neither include nor exclude, the plugin will try to get metrics from all running containers.

Configuration file

The following example configuration collects metrics from two docker instances (6bab19c3a0f9 and 14159be4ca2c).

fluent-bit.yaml

pipeline:
  inputs:
    - name: docker
      include: 6bab19c3a0f9 14159be4ca2c

  outputs:
    - name: stdout
      match: '*'

fluent-bit.conf

This configuration will produce records like the following:

[1] docker.0: [1571994772.00555745, {"id"=>"6bab19c3a0f9", "name"=>"postgresql", "cpu_used"=>172102435, "mem_used"=>5693400, "mem_limit"=>4294963200}]