MySQL Remap Plugin

This is a basic plugin for doing dynamic “remaps” from a database. It essentially rewrites the incoming request’s Host header / origin server connection to one retrieved from a database.

The generic proxying setup is the following:

UA ----> Traffic Server ----> Origin Server

Without the plugin a request like:

GET /path/to/something HTTP/1.1
Host: original.host.com

Ends up requesting http://original.host.com/path/to/something

With this plugin enabled, you can easily change that to anywhere you desire. Imagine the many possibilities….

We have benchmarked the plugin with ab at about 9200 requests/sec (1.7k object) on a commodity hardware with a local setup of both, MySQL and Traffic Server local. Real performance is likely to be substantially higher, up to the MySQL’s max queries / second.

Installation

This plugin is only built if the configure option

--enable-experimental-plugins

is given at build time.

Configuration

Import the default schema to a database you create:

mysql -u root -p -e "CREATE DATABASE mysql_remap;"   # create a new database
mysql -u root -p mysql_remap < schema/import.sql     # import the provided schema

insert some interesting values in mysql_remap.hostname & mysql_remap.map

Traffic Server plugin configuration is done inside a global configuration file: /etc/trafficserver/plugin.config:

mysql_remap.so /etc/trafficserver/mysql_remap.ini

The INI file should contain the following values:

[mysql_remap]
mysql_host     = localhost   #default
mysql_port     = 3306        #default
mysql_username = remap_user
mysql_password =
mysql_database = mysql_remap #default

To debug errors, start trafficserver manually using:

traffic_server -T "mysql_remap"

And resolve any errors or warnings displayed.