Added FORCE_PUBLIC_IP option

This option forces to write the specified public IP into the directory even if the host binding IP is specified in the docker run options.

README.md

@@ -70,6 +70,7 @@ All params are optional
 * `HOSTNAME`: Hostname of the system
 * `REGISTER=public`: Register only Ports which binds to the host interface (docker -p)
 * `REGISTER_PUBLIC_IP=10.0.1.1`: IP if Hostbinding dont specify any (docker -p 80:80 instead of docker -p 10.0.1.1:80:80)
+* `FORCE_PUBLIC_IP`: Set to force binding to the public IP even if the real binding is specified, default: not set
 * `SKYDNS_ETCD_PREFIX`: `/skydns/local/skydns`
 * `VULCAND_ETCD_PREFIX`: `/skydns/local/skydns`
 <br>

lib/container.js

@@ -59,11 +59,14 @@ Container.prototype.getServices = function() {
           debug('Omit container ' + self.cid + ' cause no exposed hostPort');
           return false;
         }
-        if(!portCfg.hostIP || portCfg.hostIP === '0.0.0.0') {
+        if(!portCfg.hostIP || portCfg.hostIP === '0.0.0.0' || process.env.FORCE_PUBLIC_IP) {
           if(!process.env.REGISTER_PUBLIC_IP) {
             console.log('Error: Port ' + portCfg.port + ' from ' + self.cid + ' listens on all interface but u did not provide REGISTER_PUBLIC_IP');
             return false;
           }
+          if (process.env.FORCE_PUBLIC_IP) {
+            debug('Forcing public IP: ' + process.env.REGISTER_PUBLIC_IP);
+          }
           service.ip = process.env.REGISTER_PUBLIC_IP;
         } else {
           service.ip = portCfg.hostIP;