docker-sd

A prometheus service-discovery for docker.

docker-sd provides service discovery, which obtains information from a configured dockerd.
The connection can be made either via the local socket or via a remote TCP connection.

Configuration example

rest_api:
  address: "0.0.0.0"
  port: 8088

docker_hosts:
  - host: "tcp://molecule.matrix.lan:2376"
    metrics_ports:
      8080: "/metrics"

The information can be retrieved via a REST API. By default, docker-sd provides an endpoint at 127.0.0.1 on port 8088 for this purpose.

Service Discovery will assign a corresponding target to each service that has an exposed port configured. The following labels will be attached to each target.

If there are rejecting paths to the export metrics interface, these can be stored accordingly in the configuration.

Example:

[
  {
    "targets": [
      "localhost:9090"
    ],
    "labels": {
      "__metrics_path__": "/metrics",
      "application": "prometheus",
      "container": "prometheus",
      "source": "metrics"
    }
  }
]

The Service Discover is activated by default for each running container, but can be deactivated via a corresponding label on the container:

    labels:
      service-discover.enabled: "false"

If necessary, a separate metrics path can be defined for each port via the labels.
This can be helpful if several ports are available for different metrics, or if ports differ from the global configuration metrics_ports.

    labels:
      service-discover.port.8199: "/metrics"
      service-discover.port.8081: "/actuator/prometheus"