Use of container.HostConfig.NetworkMode to detect host mode

Signed-off-by: Emile Vauge <emile@vauge.com>

provider/docker.go

@@ -270,12 +270,14 @@ func (provider *Docker) getIPAddress(container dockertypes.ContainerJSON) string
 			}
 		}
 	}
-	for networkName, network := range container.NetworkSettings.Networks {
-		// If net==host, quick n' dirty, we return 127.0.0.1
-		// This will work locally, but will fail with swarm.
-		if "host" == networkName {
-			return "127.0.0.1"
-		}
+
+	// If net==host, quick n' dirty, we return 127.0.0.1
+	// This will work locally, but will fail with swarm.
+	if container.HostConfig != nil && "host" == container.HostConfig.NetworkMode {
+		return "127.0.0.1"
+	}
+
+	for _, network := range container.NetworkSettings.Networks {
 		return network.IPAddress
 	}
 	return ""

provider/docker_test.go

@@ -269,6 +269,30 @@ func TestDockerGetIPAddress(t *testing.T) { // TODO
 			},
 			expected: "10.11.12.14",
 		},
+		{
+			container: docker.ContainerJSON{
+				ContainerJSONBase: &docker.ContainerJSONBase{
+					Name: "bar",
+					HostConfig: &container.HostConfig{
+						NetworkMode: "host",
+					},
+				},
+				Config: &container.Config{
+					Labels: map[string]string{},
+				},
+				NetworkSettings: &docker.NetworkSettings{
+					Networks: map[string]*network.EndpointSettings{
+						"testnet1": {
+							IPAddress: "10.11.12.13",
+						},
+						"testnet2": {
+							IPAddress: "10.11.12.14",
+						},
+					},
+				},
+			},
+			expected: "127.0.0.1",
+		},
 	}
 
 	for _, e := range containers {