Monitoring OSDs: How to Set Up Monitoring172

IntroductionObject storage devices (OSDs) are a critical component of any Ceph storage cluster. They store the data that users access, and they must be monitored closely to ensure that the cluster is operating correctly. In this article, we will cover how to set up monitoring for OSDs using the Prometheus exporter.

PrerequisitesBefore you can set up monitoring for OSDs, you must have the following:
- A Ceph storage cluster with OSDs
- A Prometheus server
- A Prometheus exporter

Prometheus ExporterThe Prometheus exporter is an open-source tool that collects metrics from OSDs and exports them in a format that Prometheus can understand. You can download the Prometheus exporter from the following URL:
`/ceph/ceph-prometheus-exporter/releases`

InstallationTo install the Prometheus exporter, follow these steps:
1. Download the Prometheus exporter binary from the URL above.
2. Copy the binary to a directory on each OSD node.
3. Create a systemd unit file for the Prometheus exporter. The unit file should contain the following contents:
```
[Unit]
Description=Ceph OSD Prometheus Exporter
After=
[Service]
User=root
Group=root
Type=simple
ExecStart=/usr/local/bin/ceph-osd-prometheus-exporter
Restart=on-failure
[Install]
WantedBy=
```
4. Save the unit file to the following directory: `/etc/systemd/system/`
5. Start the Prometheus exporter service:
```
systemctl start
```

ConfigurationOnce the Prometheus exporter is installed, you must configure it to collect metrics from OSDs. To do this, you can edit the following configuration file:
`/etc/`
The configuration file contains the following options:
- `osd_data_dir`: The directory where OSD data is stored.
- `osd_cluster_fsid`: The Ceph cluster FSID.
- `osd_host`: The hostname of the OSD node.
- `osd_id`: The ID of the OSD.
- `osd_stats_period`: The period at which OSD stats are collected.
- `prometheus_host`: The hostname of the Prometheus server.
- `prometheus_port`: The port on which the Prometheus server is listening.

MonitoringOnce the Prometheus exporter is configured, you can start monitoring OSDs. To do this, you can use the following Prometheus query:
```
ceph_osd_stat_bytes_used
```
This query will return the number of bytes used by each OSD. You can also use other Prometheus queries to monitor other OSD metrics, such as the number of reads and writes per second.

ConclusionMonitoring OSDs is essential for ensuring the health of a Ceph storage cluster. By following the steps in this article, you can set up monitoring for OSDs using the Prometheus exporter.

2025-02-22

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