added warning when size of subnet(s) being created are larger than FLAG.network_size in attempt to alleviate confusion. For example, currently when 'nova-manage network create foo 192.168.0.0/16', the result is that it creates a 192.168.0.0/24 instead without any indication to why.

1 files changed, 9 insertions, 0 deletions

diff --git a/bin/nova-manage b/bin/nova-manage
index b63bd326f..da9538e39 100755
--- a/bin/nova-manage
+++ b/bin/nova-manage
@@ -56,6 +56,7 @@
 import gettext
 import glob
 import json
+import math
 import netaddr
 import os
 import sys
@@ -669,6 +670,14 @@ class NetworkCommands(object):
             num_networks = FLAGS.num_networks
         if not network_size:
             network_size = FLAGS.network_size
+            fixnet = netaddr.IPNetwork(fixed_range)
+            each_subnet_size = fixnet.size / int(num_networks)
+            if each_subnet_size > network_size:
+                subnet = 32 - int(math.log(network_size, 2))
+                oversize_msg = _('Subnet(s) too large, defaulting to /%s.'
+                                 '  To override, specify network_size flag.'
+                                 % subnet)
+                print oversize_msg
         if not multi_host:
             multi_host = FLAGS.multi_host
         else: