diff --git a/tools/test/bin/onos-gen-config b/tools/test/bin/onos-gen-config
new file mode 100755
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+++ b/tools/test/bin/onos-gen-config
@@ -0,0 +1,100 @@
+#!/usr/bin/env python
+"""
+usage: onos-gen-config [-h] [-s PARTITION_SIZE] [-n NUM_PARTITIONS]
+                            [filename] [node_ip [node_ip ...]]
+
+Generate the partitions json file given a list of IPs or from the $OCC*
+environment variables.
+
+positional arguments:
+  filename              File to write output to. If none is provided, output
+                        is written to stdout.
+  node_ip               IP Address(es) of the node(s) in the cluster. If no
+                        IPs are given, will use the $OC* environment
+                        variables. NOTE: these arguments are only processed
+                        after the filename argument.
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -s PARTITION_SIZE, --partition-size PARTITION_SIZE
+                        Number of nodes per partition. Note that partition
+                        sizes smaller than 3 are not fault tolerant. Defaults
+                        to 3.
+  -n NUM_PARTITIONS, --num-partitions NUM_PARTITIONS
+                        Number of partitions. Defaults to the number of nodes
+                        in the cluster.
+"""
+
+from os import environ
+import argparse
+import re
+import json
+
+convert = lambda text: int(text) if text.isdigit() else text.lower()
+alphanum_key = lambda key: [convert(c) for c in re.split('([0-9]+)', key)]
+
+def get_OCC_vars():
+  vars = []
+  for var in environ:
+    if re.match(r"OCC[0-9]+", var):
+      vars.append(var)
+  return sorted(vars, key=alphanum_key)
+
+def get_nodes(ips=None, default_port=5679):
+    node = lambda id, ip, port : { 'id': id, 'ip': ip, 'port': port }
+    result = []
+    if not ips:
+        ips = [ environ[v] for v in get_OCC_vars() ]
+    i = 1
+    for ip_string in ips:
+        address_tuple = ip_string.split(":")
+        if len(address_tuple) == 3:
+            id=address_tuple[0]
+            ip=address_tuple[1]
+            port=int(address_tuple[2])
+        else:
+            id='atomix-{}'.format(i)
+            i += 1
+            ip=ip_string
+            port=default_port
+        result.append(node(id, ip, port))
+    return result
+
+if __name__ == '__main__':
+  parser = argparse.ArgumentParser(
+      description="Generate the partitions json file given a list of IPs or from the $OC* environment variables.")
+  parser.add_argument(
+      '-s', '--partition-size', type=int, default=3,
+      help="Number of nodes per partition. Note that partition sizes smaller than 3 are not fault tolerant. Defaults to 3." )
+  parser.add_argument(
+      '-n', '--num-partitions', type=int,
+      help="Number of partitions. Defaults to the number of nodes in the cluster." )
+ # TODO: make filename and nodes independent. This will break backwards compatibility with existing usage.
+  parser.add_argument(
+     'filename', metavar='filename', type=str, nargs='?',
+     help='File to write output to. If none is provided, output is written to stdout.')
+  parser.add_argument(
+      'nodes', metavar='node_ip', type=str, nargs='*',
+      help='IP Address(es) of the node(s) in the cluster. If no IPs are given, ' +
+           'will use the $OC* environment variables. NOTE: these arguemnts' +
+           ' are only processed after the filename argument.')
+
+  args = parser.parse_args()
+  filename = args.filename
+  partition_size = args.partition_size
+  cluster = get_nodes(args.nodes)
+  num_partitions = args.num_partitions
+  if not num_partitions:
+    num_partitions = len(cluster)
+
+  data = {
+           'name': 'onos',
+           'cluster': cluster
+         }
+  output = json.dumps(data, indent=4)
+
+  if filename:
+    with open(filename, 'w') as f:
+      f.write(output)
+  else:
+    print output