Ceph Exporter

Prometheus exporter that scrapes meta information about a running ceph cluster. All the information gathered from the cluster is done by interacting with the monitors using an appropriate wrapper over rados_mon_command(). Hence, no additional setup is necessary other than having a working ceph cluster.

Dependencies

You should ideally run this exporter from the client that can talk to Ceph. Like any other ceph client it needs the following files to run correctly.

• ceph.conf containing your ceph configuration.
• ceph.<user>.keyring in order to authenticate to your cluster.

Ceph exporter will automatically pick those up if they are present in any of the default locations. Otherwise you will need to provide the configuration manually using --ceph.config flag.

We use Ceph's official Golang client to run commands on the cluster.

Ceph exporter is tested only on Ceph's Hammer(v0.94) and Jewel(v10.2) releases. It might not work as expected with older or non-LTS versions of Ceph.

Flags

Name	Description	Default
telemetry.addr	Host:Port pair to run exporter on	*:9128
telemetry.path	URL Path for surfacing metrics to prometheus	/metrics
ceph.config	Path to ceph configuration file	""
ceph.user	Ceph user to connect to cluster	admin
exporter.config	Path to ceph_exporter configuration file	/etc/ceph/exporter.yml
rgw.mode	Enable collection of stats from RGW (0:disabled 1:enabled 2:background)	0

Installation

Typical way of installing in Go should work.

go install

A Makefile is provided in case you find a need for it.

Docker Image

Docker Hub

The official docker image is available at digitalocean/ceph_exporter.

Build From Source

It is also possible to build your own locally from the source. The port 9128 is exposed as a default port for ceph exporter.

The exporter needs your ceph configuration in order to establish communication with the monitors. You can either pass it in as an additional command or mount the directory containing both your ceph.conf and your user's keyring under the default /etc/ceph location that Ceph checks for.

A sample build command would look like:

$ docker build -t digitalocean/ceph_exporter .

A --build-args TEST=true flag can be added to the build command above to also run go test during build: docker build -t digitalocean/ceph_exporter . --build-arg TEST=true --no-cache

You can start running your ceph exporter container now.

$ docker run -v /etc/ceph:/etc/ceph -p=9128:9128 -it digitalocean/ceph_exporter

You would have to ensure your image can talk over to the monitors. If it needs access to your host's network stack you might need to add --net=host to the above command. It makes the port mapping redundant so the -p flag can be removed.

Point your prometheus to scrape from :9128 on your host now (or your port of choice if you decide to change it).

Contributing

Please refer to the CONTRIBUTING guide for more information on how to submit your changes to this repository.

Sample view

See ./examples for docker-compose file with Grafana if you'd like to quickly get a test environment up and running.

Link to official documentation explaining docker-compose: https://docs.docker.com/compose/

Docker-compose file itself has comments on how to change it to adapt to your environment. It does use volumes in order to persist data. Docker volumes documentation: https://docs.docker.com/engine/tutorials/dockervolumes/

If you have promdash set up you can generate views like:

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