NGINX Prometheus Exporter

NGINX Prometheus exporter makes it possible to monitor NGINX or NGINX Plus using Prometheus.

Overview

NGINX exposes a handful of metrics via the stub_status page. NGINX Plus provides a richer set of metrics via the API and the monitoring dashboard. NGINX Prometheus exporter fetches the metrics from a single NGINX or NGINX Plus, converts the metrics into appropriate Prometheus metrics types and finally exposes them via an HTTP server to be collected by Prometheus.

Getting Started

In this section, we show how to quickly run NGINX Prometheus Exporter for NGINX or NGINX Plus.

A Note about NGINX Ingress Controller

If you’d like to use the NGINX Prometheus Exporter with NGINX Ingress Controller for Kubernetes, see this doc for the installation instructions.

Prerequisites

We assume that you have already installed Prometheus and NGINX or NGINX Plus. Additionally, you need to:

Expose the built-in metrics in NGINX/NGINX Plus:
- For NGINX, expose the stub_status page at /stub_status on port 8080.
- For NGINX Plus, expose the API at /api on port 8080.
Configure Prometheus to scrape metrics from the server with the exporter. Note that the default scrape port of the exporter is 9113 and the default metrics path -- /metrics.

Running the Exporter in a Docker Container

To start the exporter we use the docker run command.

To export NGINX metrics, run:

$ docker run -p 9113:9113 nginx/nginx-prometheus-exporter:0.3.0 -nginx.scrape-uri http://<nginx>:8080/stub_status

where <nginx> is the IP address/DNS name, through which NGINX is available.

To export NGINX Plus metrics, run:

$ docker run -p 9113:9113 nginx/nginx-prometheus-exporter:0.3.0 -nginx.plus -nginx.scrape-uri http://<nginx-plus>:8080/api

where <nginx-plus> is the IP address/DNS name, through which NGINX Plus is available.

Running the Exporter Binary

To export NGINX metrics, run:
```
$ nginx-prometheus-exporter -nginx.scrape-uri http://<nginx>:8080/stub_status
```
where <nginx> is the IP address/DNS name, through which NGINX is available.
To export NGINX Plus metrics:
```
$ nginx-prometheus-exporter -nginx.plus -nginx.scrape-uri http://<nginx-plus>:8080/api
```
where <nginx-plus> is the IP address/DNS name, through which NGINX Plus is available.

Note. The nginx-prometheus-exporter is not a daemon. To run the exporter as a system service (daemon), configure the init system of your Linux server (such as systemd or Upstart) accordingly. Alternatively, you can run the exporter in a Docker container.

Usage

Command-line Arguments

Usage of ./nginx-prometheus-exporter:
  -nginx.plus
        Start the exporter for NGINX Plus. By default, the exporter is started for NGINX. The default value can be overwritten by NGINX_PLUS environment variable.
  -nginx.retries int
        A number of retries the exporter will make on start to connect to the NGINX stub_status page/NGINX Plus API before exiting with an error. The default value can be overwritten by NGINX_RETRIES environment variable.
  -nginx.retry-interval duration
        An interval between retries to connect to the NGINX stub_status page/NGINX Plus API on start. The default value can be overwritten by NGINX_RETRY_INTERVAL environment variable. (default 5s)
  -nginx.scrape-uri string
        A URI for scraping NGINX or NGINX Plus metrics.
        For NGINX, the stub_status page must be available through the URI. For NGINX Plus -- the API. The default value can be overwritten by SCRAPE_URI environment variable. (default "http://127.0.0.1:8080/stub_status")
  -nginx.ssl-verify
        Perform SSL certificate verification. The default value can be overwritten by SSL_VERIFY environment variable. (default true)
  -nginx.timeout duration
        A timeout for scraping metrics from NGINX or NGINX Plus. The default value can be overwritten by TIMEOUT environment variable. (default 5s)
  -web.listen-address string
        An address to listen on for web interface and telemetry. The default value can be overwritten by LISTEN_ADDRESS environment variable. (default ":9113")
  -web.telemetry-path string
        A path under which to expose metrics. The default value can be overwritten by TELEMETRY_PATH environment variable. (default "/metrics")

Exported Metrics

Common metrics:
- nginxexporter_build_info -- shows the exporter build information.
For NGINX, the following metrics are exported:
- All stub_status metrics.
- nginx_up -- shows the status of the last metric scrape: 1 for a successful scrape and 0 for a failed one.
Connect to the /metrics page of the running exporter to see the complete list of metrics along with their descriptions.
For NGINX Plus, the following metrics are exported:
- Connections.
- HTTP.
- SSL.
- HTTP Server Zones.
- Stream Server Zones.
- HTTP Upstreams. Note: for the state metric, the string values are converted to float64 using the following rule: "up" -> 1.0, "draining" -> 2.0, "down" -> 3.0, "unavail" –> 4.0, "checking" –> 5.0, "unhealthy" -> 6.0.
- Stream Upstreams. Note: for the state metric, the string values are converted to float64 using the following rule: "up" -> 1.0, "down" -> 3.0, "unavail" –> 4.0, "checking" –> 5.0, "unhealthy" -> 6.0.
- nginxplus_up -- shows the status of the last metric scrape: 1 for a successful scrape and 0 for a failed one.
Connect to the /metrics page of the running exporter to see the complete list of metrics along with their descriptions. Note: to see server zones related metrics you must configure status zones and to see upstream related metrics you must configure upstreams with a shared memory zone.

Troubleshooting

The exporter logs errors to the standard output. When using Docker, if the exporter doesn’t work as expected, check its logs using docker logs command.

Releases

For each release, we publish the corresponding Docker image at nginx/nginx-prometheus-exporter DockerHub repo and the binaries on the GitHub releases page.

Building the Exporter

You can build the exporter using the provided Makefile. Before building the exporter, make sure the following software is installed on your machine:

make
git
Docker for building the container image
Go for building the binary

Building the Docker Image

To build the Docker image with the exporter, run:

$ make container

Note: go is not required, as the exporter binary is built in a Docker container. See the Dockerfile.

Building the Binary

To build the binary, run:

$ make

Note: the binary is built for the OS/arch of your machine. To build binaries for other platforms, see the Makefile.

The binary is built with the name nginx-prometheus-exporter.

Support

The commercial support is available for NGINX Plus customers when the NGINX Prometheus Exporter is used with NGINX Ingress Controller.

License

Apache License, Version 2.0.

gregoirer/nginx-prometheus-exporter