hadoop/hadoop-hdds/docs/content/recipe/Prometheus.md

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---
title: Monitoring with Prometheus
summary: A Simple recipe to monitor Ozone using Prometheus
linktitle: Prometheus
---
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[Prometheus](https://prometheus.io/) is an open-source monitoring server developed under under the [Cloud Native Computing Foundation](https://www.cncf.io/).
Ozone supports Prometheus out of the box. The servers start a prometheus
compatible metrics endpoint where all the available hadoop metrics are published in prometheus exporter format.
## Prerequisites
1. [Install the and start]({{< ref "start/RunningViaDocker.md" >}}) an Ozone cluster.
2. [Download](https://prometheus.io/download/#prometheus) the prometheus binary.
## Monitoring with prometheus
(1) To enable the Prometheus metrics endpoint you need to add a new configuration to the `ozone-site.xml` file:
```
<property>
<name>hdds.prometheus.endpoint.enabled</name>
<value>true</value>
</property>
```
_Note_: for Docker compose based pseudo cluster put the `OZONE-SITE.XML_hdds.prometheus.endpoint.enabled=true` line to the `docker-config` file.
(2) Restart the Ozone Manager and Storage Container Manager and check the prometheus endpoints:
* http://scm:9874/prom
* http://ozoneManager:9876/prom
(3) Create a prometheus.yaml configuration with the previous endpoints:
```yaml
global:
scrape_interval: 15s
scrape_configs:
- job_name: ozone
metrics_path: /prom
static_configs:
- targets:
- "scm:9876"
- "ozoneManager:9874"
```
(4) Start with prometheus from the directory where you have the prometheus.yaml file:
```
prometheus
```
(5) Check the active targets in the prometheus web-ui:
http://localhost:9090/targets
![Prometheus target page example](prometheus.png)
(6) Check any metrics on the prometheus web ui. For example:
http://localhost:9090/graph?g0.range_input=1h&g0.expr=om_metrics_num_key_allocate&g0.tab=1
![Prometheus target page example](prometheus-key-allocate.png)
## Note
The ozone distribution contains a ready-to-use, dockerized environment to try out ozone and prometheus. It can be found under `compose/ozoneperf` directory.
```bash
cd compose/ozoneperf
docker-compose up -d
```