Resources about Rancher
$ sudo ros config merge
<config options in YAML format..>
<CTRL-D>
wget -O - https://raw.githubusercontent.com/docker-muenster/rancher/master/cloud-config/cloud-config.yml | sudo ros config merge
First, change the network configuration in the cloud config (see above on how do do that).
Then apply the new cloud config on the system:
$ sudo cloud-init -execute
For the new network configuration to take effect, you have to restart the network service:
$ sudo ros service restart network