Why bootdev — Nginx conf extended

Recently, one of our Drupal stack really high CPU, It do monthly increased 30% RPM (request per minute) from new relic. BTW, i think its CPU wont increase like 40%. During my investigation,

  1. some robots scan can somehow eat your CPU. Like many robots will look for wp-login as it guess you are wordpress site and more.
  2. Your CDN may pull your data but goes to a wrong URL and have a ERROR in your php-fpm log
  3. robot from same IP address(es) keep scan your site

We here added some conf which help about 6-7% CPU decrease for a 300-400 RPM Drupal site.

#Set a limit connection zone
limit_conn_zone $binary_remote_addr zone=gulag:5m;

#Check robot
map $http_user_agent $is_bot {
default  ”;
~*crawl|goog|yahoo|yandex|spider|bot|tracker|click|parser is_bot;
}
###
### Send all known bots to $args free URLs.
###
location @nobots {
if ($is_bot) {
rewrite ^ $scheme://$host$uri? permanent;
}
rewrite ^/(.*)$  /index.php?q=$1 last;
}

#In CDN Config and Advagg conf of Drupal nginx,
#add below to restrict same IP only allow 32 connections
limit_conn gulag 32;
#Block connection if it is robots (Put anywhere u like)
try_files  $uri @nobots;

#Block wordpress scan attack
location ~ ^/(wp-admin|wp-login\.php) {
deny all;
}

The block wordpress scan thing can add anything that u find strange from php-fpm/error.log by just changing the path pattern

I have load balancer setup with 2 web server, one with and one without config above. The different on Amazon m3.large is about 6% in a 300-400RPM website, in which both server throughput the same RPM.

Of coz, the above settings is updated into BootDev Nginx conf.

Enjoy🙂

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