Boundary Nginx Free Plugin

A Boundary plugin that collects metrics from an Nginx Free instance. This plugin is not intended for the Nginx Plus edition as other metrics are relevant and available there.

Prerequisites

Supported OS

OS	Linux	Windows	SmartOS	OS X
Supported	v	v	v	v

Boundary Meter versions v4.2 or later

• To install new meter go to Settings->Installation or see instructons.
• To upgrade the meter to the latest version - see instructons.

For Boundary Meter earlier than v4.2

Runtime	node.js	Python	Java
Required	+

• How to install node.js?

Plugin Setup

To collect statistics from nginx, it needs to built with the nginx HttpStubStatusModule. If you used a package manager to install Nginx, it should be compiled by default, if you built Nginx yourself, you may need to recompile it.

Verify That nginx Includes HttpStubStatusModule

1. To check if your nginx has been build with the nginx HttpStubStatusModule run the following command, which will display the modules that are compiled in your version of nginx:

$ nginx -V ``` 2. If the string --with-http_stub_status_module is in the output then the installed `nginx` includes the `HttpStubStatusModule`. If the string is not there, you will need to install a package that includes the module or compile a version that includes it. Information on installing and/or compiling `nginx` can found here: http://nginx.org/en/docs/install.html

HttpStubStatusModule Configuration

nginx requires configuration to provide URL path which will present the nginx statistics.

1. Edit your default /etc/nginx/conf.d/virtual.conf file (or whatever .conf file you are using) and add the following configuration in your server {} block:

location /nginx_status { # activate stub_status module stub_status on;

# do not log graphdat polling the endpoint
access_log off;

# restrict access to local only
allow 127.0.0.1;
deny all;

# optional, should be JSON by default
      status_format json;

} ``` 2. Ensure that a listen address is configured in /etc/nginx/conf.d/virtual.conf under the server {} block as well. An complete example that configures the HttpStubStatusModule is shown here:

 ```
 server {
   listen       8000;
   location /nginx_status {
   # activate stub_status module
   stub_status on;

   # do not log graphdat polling the endpoint
   access_log off;

   # restrict access to local only
   allow 127.0.0.1;
   deny all;
   }
}
```

4. Once you make the update, reload your nginx configuration:

    $ sudo service nginx reload

Verify HttpStubStatusModule is Collecting Statistics

1. Run the following command, which shows the expected output:

   $ curl http://localhost:8000/nginx_status
   Active connections: 1
   server accepts handled requests
   5 5 5
   Reading: 0 Writing: 1 Waiting: 0

Plugin Configuration Fields

Field Name	Description
Source	The Source to display in the legend for the nginx data. It will default to the hostname of the server
Statistics URL	The URL endpoint of where the nginx statistics are hosted.
Strict SSL	Use Strict SSL checking when HTTPS is enabled, enabled by default
Username	If the endpoint is password protected, what username should graphdat use when calling it.
Password	If the endpoint is password protected, what password should graphdat use when calling it.

Metrics Collected

For All Versions

Metric Name	Description
Nginx Active Connections	Active connections to nginx
Nginx Reads	Connections with Nginx reading request headers
Nginx Writes	Connections with Nginx reading request body, processing request or writing response to client.
Nginx Waiting	Keep-alive connections with Nginx in a wait state
Nginx Connections Handled	Connections handled by nginx
Nginx Connections Not Handled	Connections accepted, but not handled
Nginx Requests	Requests to nginx
Nginx Requests per Connection	Requests per handled connections for nginx

Dashboards

• NGINX Free

References

http://nginx.org/en/docs/http/ngx_http_stub_status_module.html