feat(controller): allow user to scale gunicorn worker processes

Author: mboersma

conf.d/gconf.toml

@@ -0,0 +1,10 @@
+[template]
+src   = "gconf.py"
+dest  = "/app/deis/gconf.py"
+uid = 1000
+gid = 1000
+mode  = "0640"
+keys = [
+  "/deis/controller",
+]
+reload_cmd = "/app/bin/reload"

deis/gconf.py templates/gconf.pydeis/gconf.py renamed to templates/gconf.py

@@ -1,7 +1,12 @@
-import multiprocessing
-
 bind = '0.0.0.0'
-workers = multiprocessing.cpu_count() * 2 + 1
+try:
+    workers = int({{ if exists "/deis/controller/workers" }}{{ getv "/deis/controller/workers" }}{{ else }}"not set"{{end}})
+except (NameError, ValueError):
+    import multiprocessing
+    try:
+        workers = multiprocessing.cpu_count() * 2 + 1
+    except NotImplementedError:
+        workers = 8
 proc_name = 'deis-controller'
 timeout = 1200
 pidfile = '/tmp/gunicorn.pid'