NGINX Cookbook

How to do it...

To implement our simple hit counter, we're going to add a basic location block directive to our main nginx.conf configuration file. Here's the block directive to add:

location /redistest { 
    default_type 'text/plain'; 
    content_by_lua_block { 
        local redis = require "resty.redis" 
        local red = redis:new() 
        local ok, err = red:connect("127.0.0.1", 6379) 
        if not ok then 
            ngx.say("Failed to connect to the redis server, the error was: ", err) 
        end 
        local counter = red:get("counter") 
        if tonumber(counter) == nil then 
            counter = 0 
        end 
        counter = counter + 1 
        local ok, err = red:set("counter", counter) 
        ngx.say(counter) 
    } 
} 

If we call the /redistest URL, we should see the counter increase each time the page is refreshed.