From 92ef21d2ec0336df8adc7dd8907587894f4b0a39 Mon Sep 17 00:00:00 2001
From: Chanwit Kaewkasi <chanwit@gmail.com>
Date: Thu, 12 Mar 2015 11:53:19 +0700
Subject: [PATCH] explain ip generator in discovery/README

Signed-off-by: Chanwit Kaewkasi <chanwit@gmail.com>
---
 discovery/README.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/discovery/README.md b/discovery/README.md
index df99ed9d92..2fe6a6baf7 100644
--- a/discovery/README.md
+++ b/discovery/README.md
@@ -149,6 +149,27 @@ $ docker -H <swarm_ip:swarm_port> logs ...
 ...
 ```
 
+### Range pattern for IP addresses
+
+The `file` and `nodes` discoveries support a range pattern to specify IP addresses, i.e., `10.0.0.[10:200]` will be a list of nodes starting from `10.0.0.10` to `10.0.0.200`.
+
+For example,
+
+```bash
+# file example
+$ echo 10.0.0.[11:100]:2375   >> /tmp/my_cluster
+$ echo 10.0.1.[15:20]:2375    >> /tmp/my_cluster
+$ echo 192.168.1.2:[2:20]375  >> /tmp/my_cluster
+
+# start the manager
+$ swarm manage -H tcp://<swarm_ip:swarm_port> file:///tmp/my_cluster
+```
+
+```bash
+# nodes example
+$ swarm manage -H <swarm_ip:swarm_port> nodes://10.0.0.[10:200]:2375,10.0.1.[2:250]:2375
+```
+
 ## Contributing a new discovery backend
 
 Contributing a new discovery backend is easy,