[erlang-questions] Deploying multiple webapps

Hugo Mills hugo@REDACTED
Wed Dec 16 00:41:47 CET 2015

   I've got a collection of small services, with minimal coupling
between the back ends of those services (orchestration is done mostly
client-side). I'd like to put an HTTPS interface in front of each one
-- say, with cowboy.

   What I'd also like to be able to do, at least in principle, is
deploy some arbitrary subset of those services on each machine in my
(comedically-named) server farm. I'd like to be able to do this with
one TLS configuration, and preferably under a single port.

i.e., access my services through


   Now, in python-land, which is largely where I come from, I'd set up
Apache with mod-wsgi, and deploy each WSGI app to a specific URL
within the same URL namespace. I'm not quite sure how to do that
easily with erlang+cowboy, because there seems to be no easy way of
treating a webapp as a unit within a larger server configuration. I
keep coming to one of two approaches:

1) Write each service completely independently (as HTTP), run it on a
   distinct port, and splice together the URL namespaces through a
   reverse proxy on a "normal" web server like Apache.

2) Find some way to automatically write a top-level router for cowboy,
   for each set of services that I want to deploy to a machine.

   I don't much like option 1, but I like option 2 even less. I guess
I could write some kind of "top-level" app that, given a bunch of
webapp modules (via a configuration file of some kind), gets a router
for each module and transforms those routers into a single router
config. Does such a thing already exist?

   It all just feels a bit awkward, and I feel like I'm missing
something. What do other people do to put together this kind of setup?


Hugo Mills             | I spent most of my money on drink, women and fast
hugo@REDACTED carfax.org.uk | cars. The rest I wasted.
http://carfax.org.uk/  |
PGP: E2AB1DE4          |                                            James Hunt
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