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Service Discovery. Dynamically generating routing rules so microservices can have pretty URLs. For example with us when you deploy a new version of a microservice it starts on a random port, registers with Consul on startup and then dynamically regenerates and reloads Nginx.

I know of at least one VPS company that build its load balancer SaaS offering on NGINX and it automatically reloads whenever a node is added/removed.

So I would assume it was that function that would cause such rapid reloads. [e.g. If you had a 50 node pool, you might go +/-5 over a span of a second and change the config 5 times in 1s]

I front my docker fleet with Nginx and I need to reload config for new hosts

Dynamically generating urls, like tumblr or github pages? (just a guess)