Fix a race condition when starting master and nodes at the same time

services/discovery.go

@@ -33,6 +33,10 @@ var memberlist = &Unit{
 			// Try and find master node if required
 			if c.masterNode == nil {
 				for _, node := range c.nodes {
+					// In case node meta is inconsistent, do not try to connect to an invalid address
+					if !node.VpnIP.Addr().IsValid() {
+						continue
+					}
 					if node.Role == "master" || node.Role == "full" {
 						u.Manager.Logger.Info("found remote master", "name", node.Name)
 						c.masterNode = node