docker-registry-exporter

Prometheus exporter for the opensource Docker registry's file storage system.

It is intended to run as a sidecar in Kubernetes mounting the same persistent volume as the Docker registry.

Running the exporter

If running in Kubernetes, you can run the exporter as a sidecar container to your regular registry image:

containers:
- image: registry:2
  name: registry
  ports:
  - containerPort: 5000
    name: http
    protocol: TCP
  readinessProbe:
    httpGet:
      path: /
      port: 5000
    initialDelaySeconds: 1
    timeoutSeconds: 1
  livenessProbe:
    httpGet:
      path: /
      port: 5000
    initialDelaySeconds: 1
    timeoutSeconds: 1
  volumeMounts:
  - name: storage
    mountPath: /var/lib/registry

- image: skyuk/docker-registry-exporter:v1.0.0
  name: registry-exporter
  args:
    - /var/lib/registry/docker/registry/v2
  ports:
  - containerPort: 8080
    name: http
    protocol: TCP
  volumeMounts:
  - name: storage
    mountPath: /var/lib/registry

volumes:
- name: storage
  persistentVolumeClaim:
    claimName: registry

Metrics produced

The exporter produces four metrics:

• repository_tags_total - a Gauge representing the number of tags for each repository in the registry
  • Labels: repository
• repository_revisions_total - a Gauge representing the number of revisions for each repository in the registry
  • Labels: repository
• repository_tag_layers_total - a Gauge representing the number of layers for each tag for each repository in the registry
  • Labels: repository, tag
• repository_tag_size_bytes - a Gauge representing the sum of the size of each layer for each tag for each repository in the resitry
  • Labels: repository, tag

Development

Please see our Contributing guidelines for more information.

Releasing

See instructions in eponymous section in CONTRIBUTING.md