Nginx Realtime Log

This is a Node.js app that will report realtime visitors and the number of requests.

Setup

The app uses Redis. This assumes Redis is on localhost. Update the settings in settings.js.

npm install
node app.js

Then open browser to http://localhost:3000/

Nginx Setup

In order to log requests, the following LUA script needs to be put into the Nginx config. You will need a modern version of Nginx along with LUA and the redis-lua library. Here is an example setup for Ubuntu 12.04:

apt-get install -y nginx-extras liblua5.1-socket2
mkdir -p /usr/share/lua/5.1/
wget https://raw.github.com/nrk/redis-lua/version-2.0/src/redis.lua -O /usr/share/lua/5.1/redis.lua

Then add the following LUA script to the Nginx config:

location / {
    access_by_lua '
      local redis = require "redis";
      local r = redis.connect("127.0.0.1", 6379);
      local client = ngx.var.remote_addr;
      if not r:ping() then
        ngx.log(ngx.WARN, "Redis error");
      else
        local key = "clients:" .. client;
        local requests = r:incr(key);
        r:expire(key, 30);
        r:publish("nginx-rt", client .. ":" .. requests);
      end
    ';
    try_files $uri $uri/ /index.html;
}

Update the redis.connect("127.0.0.1", 6379); line with your Redis host.

Note: This is for the default location (/). To add to an existing block, simply add the access_by_lua script before the try_files, root, or proxy_pass.

By default, the Redis keys are set to expire in 30 seconds. Depending on your traffic and your preference of to how long you want data, you can change the r:expire(key, 30); to a different threshold (in seconds).

Misc

Excluding Hosts

If you want to exclude certain hosts from showing, simply add the IP to the EXCLUDED_HOSTS array in settings.js:

EXCLUDED_HOSTS: [ '127.0.0.1' ],

Screenshots