Prom Nginx Exporter

Prom Nginx Exporter is nginx statistics exporter for Prometheus.

The Prom Nginx Exporter requests the nginx or nginx plus stats from specified endpoints and exposes them for Prometheus consumption.

Building and running

For linux:

$ make build-linux
 >> installing dependencies                                                                                                                                                            │
 glide install
 ...
$ ./linux_amd64/nginx-plus-exporter listen-address="localhost:9005" --metrics-path="/metrics" --namespace="nginxplus" --nginx-stats-urls="localhost:9002/status" --nginx-stats-urls="localhost:9003/status" --nginx-plus-stats-urls="localhost:9004/status"

For darwin:

$ make build-darwin
 >> installing dependencies                                                                                                                                                            │
 glide install
 ...
$ ./darwin_amd64/nginx-plus-exporter listen-address="localhost:9005" --metrics-path="/metrics" --namespace="nginxplus" --nginx-stats-urls="localhost:9002/status" --nginx-stats-urls="localhost:9003/status" --nginx-plus-stats-urls="localhost:9004/status"

Other useful make commands:

The building application for linux with amd65 architecture:

$ make build

The running unit tests:

$ make test

The creating docker image:

$ make docker

The applying go tool to code:

$ make fmt
>> formatting source

$ make lint
>> linting source

$ make imports
>> fixing source imports

The running all targets:

$ make all

It will get all necessary dependencies, run unit tests and build application for linux with amd64 architecture.

Flags

Name	Required	Multiple	Default	Description
listen-address	no	no	localhost:9001	Address on which to expose metrics and web interface.
metrics-path	no	no	/metrics	Path under which to expose metrics.
namespace	no	no	nginx	The namespace of metrics.
nginx-stats-urls	yes	yes	-	An array of Nginx URL to gather stats.
nginx-plus-stats-urls	yes	yes	-	An array of Nginx Plus URL to gather stats.

What's exported?

It exports statistics of standart Nginx module (https://nginx.org/en/docs/http/ngx_http_stub_status_module.html) and Nginx Plus module (http://nginx.org/en/docs/http/ngx_http_status_module.html).

Handling different value types

Note, that some fields of nginx statistics have bool or strings type of values. Therefore there use the following algorithm of converting such fields into float64:

• The bool value: the value false is converted to float64(1), the value true is converted to float64(0).
• The string value "up", "down": the value "up" is converted to float(1), the value "down" is converted to float(0).