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Nginx upstream status

This module provides a handler called upstream_status that can be used as follows:

location /upstream_status {
  upstream_status;
}

It reports all the upstream blocks configured for this server in JSON. For upstreams managed using round robin (default upstream), it lists all the servers configured in an upstream, and indicates the current status (up/down).

{"application_pool":[{"server":"117.53.170.16:80","status":"up"},{"server":"117.53.170.17:80","status":"up"}],"another_pool":[]}

Installation

You will need to re-compile Nginx from source to include this module.

./configure --add-module=/path/to/ngx_upstream_status
make
make install

Usage

Add a new location block to your Nginx config

location /status/upstreams {
  upstream_status;
  allow 127.0.0.1;
  deny *;
}

Limitations

Nginx maintains the upstream status on a per worker basis. This module shows the status of the upstream servers as seen by the worker that served the status page. In setups where there is just one worker, this is not a issue.

(Thanks to Maxim Dounin for pointing this out)