Use docker 1.13 to allow overlay networks

- Print error if resizing fails

README.md

@@ -9,7 +9,11 @@ A live version is available at: http://play-with-docker.com/
 
 ## Requirements
 
-Docker 1.12.1 or higher is required.
+Docker 1.13+ is required. You can use docker-machine with the following command:
+
+```
+docker-machine create -d virtualbox --virtualbox-boot2docker-url https://github.com/boot2docker/boot2docker/releases/download/v1.13.0-rc1/boot2docker.iso <name>
+```
 
 ## Installation
 

services/client.go

@@ -1,6 +1,10 @@
 package services
 
-import "github.com/googollee/go-socket.io"
+import (
+	"log"
+
+	"github.com/googollee/go-socket.io"
+)
 
 type ViewPort struct {
 	Rows uint
@@ -41,7 +45,10 @@ func NewClient(so socketio.Socket, session *Session) *Client {
 		// Resize all terminals in the session
 		wsServer.BroadcastTo(session.Id, "viewport resize", vp.Cols, vp.Rows)
 		for _, instance := range session.Instances {
-			instance.ResizeTerminal(vp.Cols, vp.Rows)
+			err := instance.ResizeTerminal(vp.Cols, vp.Rows)
+			if err != nil {
+				log.Println("Error resizing terminal", err)
+			}
 		}
 	})
 	so.On("disconnection", func() {

services/docker.go

@@ -27,7 +27,7 @@ func GetContainerInfo(id string) (types.ContainerJSON, error) {
 }
 
 func CreateNetwork(name string) error {
-	opts := types.NetworkCreate{}
+	opts := types.NetworkCreate{Driver: "overlay", Attachable: true}
 	_, err := c.NetworkCreate(context.Background(), name, opts)
 
 	if err != nil {

services/instance.go

@@ -39,11 +39,10 @@ func getDindImageName() string {
 func NewInstance(session *Session) (*Instance, error) {
 	log.Printf("NewInstance - using image: [%s]\n", dindImage)
 	instance, err := CreateInstance(session.Id, dindImage)
-	instance.Session = session
-
 	if err != nil {
 		return nil, err
 	}
+	instance.Session = session
 
 	if session.Instances == nil {
 		session.Instances = make(map[string]*Instance)
@@ -66,8 +65,8 @@ func (s *sessionWriter) Write(p []byte) (n int, err error) {
 	return len(p), nil
 }
 
-func (i *Instance) ResizeTerminal(cols, rows uint) {
-	ResizeExecConnection(i.ExecId, i.Ctx, cols, rows)
+func (i *Instance) ResizeTerminal(cols, rows uint) error {
+	return ResizeExecConnection(i.ExecId, i.Ctx, cols, rows)
 }
 
 func (i *Instance) Exec() {

services/session.go

@@ -42,7 +42,7 @@ func init() {
 }
 
 func CreateWSServer() *socketio.Server {
-	server, err := socketio.NewServer(nil)
+	server, err := socketio.NewServer([]string{"websocket", "polling"})
 	if err != nil {
 		log.Fatal(err)
 	}