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prometheus.md

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prometheus

This plugin serves a prometheus.io compatible endpoint for DRBD resources exposing various DRBD metrics.

The plugin is enabled by adding a prometheus section to drbd-reactor's configuration:

[[prometheus]]
enums = true

Metrics

  • drbdreactor_up gauge: Boolean indicating whether or not drbdreactor is running. Always 1
  • drbd_kernel_version gauge: Version of the loaded DRBD kernel module and DRBD utils
  • drbd_connection_apinflight_bytes gauge: Number of application requests in flight (not completed)
  • drbd_connection_congested gauge: Boolean whether the TCP send buffer of the data connection is more than 80% filled
  • drbd_connection_rsinflight_bytes gauge: Number of resync requests in flight
  • drbd_connection_state gauge: DRBD connection state
  • drbd_device_alsuspended gauge: Boolean whether the Activity-Log is suspended
  • drbd_device_alwrites_total counter: Number of updates of the activity log area of the meta data
  • drbd_device_bmwrites_total counter: Number of updates of the bitmap area of the meta data
  • drbd_device_client gauge: Boolean whether this device is a client (i.e., intentional diskless)
  • drbd_device_lowerpending gauge: Number of open requests to the local I/O sub-system issued by DRBD
  • drbd_device_quorum gauge: Boolean if this device has DRBD quorum
  • drbd_device_read_bytes_total counter: Net data read from local hard disk
  • drbd_device_size_bytes gauge: Device size in bytes
  • drbd_device_state gauge: DRBD device state
  • drbd_device_unintentionaldiskless gauge: Boolean whether the devices is unintentional diskless
  • drbd_device_upperpending gauge: Number of block I/O requests forwarded to DRBD, but not yet answered by DRBD.
  • drbd_device_written_bytes_total counter: Net data written on local disk
  • drbd_peerdevice_outofsync_bytes gauge: Number of bytes currently out of sync with this peer, according to the bitmap that DRBD has for it
  • drbd_peerdevice_sent_bytes: Number of bytes currently sent to this peer
  • drbd_peerdevice_received_bytes: Number of bytes currently received from this peer
  • drbd_resource_maypromote gauge: Boolean whether the resource may be promoted to Primary
  • drbd_resource_promotionscore gauge: The promotion score (higher is better) for the resource
  • drbd_resource_resources gauge: Number of resources
  • drbd_resource_role gauge: DRBD role of the resource
  • drbd_resource_suspended gauge: Boolean whether the resource is suspended

Grafana Dashboard

With its Prometheus plugin, drbd-reactor exports a powerful set of Prometheus metrics which can be used to optimally monitor a DRBD deployment.

In this repository, we provide an example dashboard that showcases some of the generic use cases that can be accomplished with these metrics.

The json files can simply be imported into your Grafana instance.

dashboard