Enabling /etc/hosts parsing by default in greendns, solves a few silly-seeming issues like not being able to look up localhost.

eventlet/support/greendns.py

@@ -68,9 +68,12 @@ class ResolverProxy(object):
             self._load_etc_hosts()
 
     def _load_etc_hosts(self):
+        try:
             fd = open('/etc/hosts', 'r')
             contents = fd.read()
             fd.close()
+        except (IOError, OSError):
+            return
         contents = [line for line in contents.split('\n') if line and not line[0] == '#']
         for line in contents:
             line = line.replace('\t', ' ')
@@ -104,7 +107,7 @@ class ResolverProxy(object):
 #
 # cache
 #
-resolver  = ResolverProxy()
+resolver  = ResolverProxy(dev=True)
 
 def resolve(name):
     error = None