What do you use for service discovery?
There's a ton of choices out there - etcd, zookeeper, and more.
What are some of the pitfalls I should be aware of?
Should I keep things simple and roll my own using Redis backed by sentinel/clustering?
Can someone give a really brief description of what service discovery is, and when/why one would need it?
What's wrong with simply having a config file that tells your code the URL for each service it depends on (assuming my understanding of what discovery is is valid)?