Nginx on Azure

Nginx works on Azure, absolutely no issues. It has very vast capabilities. I came to know of few of them only when customer requested that discussion.

1. Ability to control request processing – Customer wanted to throttle number of requests coming from a particular IP address. This was easily done with limit_req module directive. It allowed easy throttling behavior defn, what to do when limits are reached, crossed. Logging is done for these kind of requests and ability to send specific http error message is possible. (503 is enough). It also enables storing the state of current excessing requests. Another learning was to use $binary to help pack a little bit more – though it does make it difficult to decipher in simple way. So in the http block

limit_req_zone $binary_remote_addr zone=searchz:10m rate=5r/s;

followed by location (end points which need this – login/search)

location = /search.html { limit_req zone=searchz nodelay; }

This protects very nicely against http issues but does not protect against ping floods and other ways people can do ddos for your application. This is best prevented/controlled in some kind of appliance (hw) or at least iptables. That though is different subject alltogether. There is another directive

2. Splitting clients for testing – This too is very easily done in the configuration with split_clients directive. It can also be used to set specific querystring parameters very easily.

Yes there are dedicated services/apps to do achieve same functionality – but it is wonderful to learn everyday. Customer/Partners are King and honestly  great teachers.

Nginx on Azure

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