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The story of Heroku (Changelog Interviews #513)

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Using a C Module for NGINX to Dynamic Routing

The idea of dynamically provisioning processes was originally developed at Heroku. The team used to rewrite hdb.conf every time a user process started to stop and then restart the process that didn't work at all for Apache. They discovered NGINX which had a SIGHUP signal that basically said reload the state from the config and reconfigure yourself. That turned out to be the keystone piece of making it possible to dynamically bring up and down these processes, they called them dinos.

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