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explain ip generator in discovery/README 

Signed-off-by: Chanwit Kaewkasi <chanwit@gmail.com>
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Chanwit Kaewkasi 2015-03-12 11:53:19 +07:00
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@ -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,