diff --git a/gns3server/compute/docker/__init__.py b/gns3server/compute/docker/__init__.py
index 7e3ccd69..b7ce5339 100644
--- a/gns3server/compute/docker/__init__.py
+++ b/gns3server/compute/docker/__init__.py
@@ -36,6 +36,7 @@ log = logging.getLogger(__name__)
 # Be carefull to keep it consistent
 DOCKER_MINIMUM_API_VERSION = "1.25"
 DOCKER_MINIMUM_VERSION = "1.13"
+DOCKER_PREFERRED_API_VERSION = "1.30"
 
 
 class Docker(BaseManager):
@@ -50,6 +51,7 @@ class Docker(BaseManager):
         self.ubridge_lock = asyncio.Lock()
         self._connector = None
         self._session = None
+        self._api_version = DOCKER_MINIMUM_API_VERSION
 
     @asyncio.coroutine
     def _check_connection(self):
@@ -61,8 +63,17 @@ class Docker(BaseManager):
             except (aiohttp.ClientOSError, FileNotFoundError):
                 self._connected = False
                 raise DockerError("Can't connect to docker daemon")
-            if parse_version(version["ApiVersion"]) < parse_version(DOCKER_MINIMUM_API_VERSION):
-                raise DockerError("Docker version is {}. GNS3 requires a minimum version of {}".format(version["Version"], DOCKER_MINIMUM_VERSION))
+
+            docker_version = parse_version(version['ApiVersion'])
+
+            if docker_version < parse_version(DOCKER_MINIMUM_API_VERSION):
+                raise DockerError(
+                    "Docker version is {}. GNS3 requires a minimum version of {}".format(
+                        version["Version"], DOCKER_MINIMUM_VERSION))
+
+            preferred_api_version = parse_version(DOCKER_PREFERRED_API_VERSION)
+            if docker_version >= preferred_api_version:
+                self._api_version = DOCKER_PREFERRED_API_VERSION
 
     def connector(self):
         if self._connector is None or self._connector.closed:
@@ -165,10 +176,10 @@ class Docker(BaseManager):
         :returns: Websocket
         """
 
-        url = "http://docker/v" + DOCKER_MINIMUM_API_VERSION + "/" + path
-        connection = yield from self._session.ws_connect(url,
-                                                         origin="http://docker",
-                                                         autoping=True)
+        url = "http://docker/v" + self._api_version + "/" + path
+        connection = yield from aiohttp.ws_connect(url,
+                                                   origin="http://docker",
+                                                   autoping=True)
         return connection
 
     @locked_coroutine
diff --git a/gns3server/compute/docker/__init__.py.orig b/gns3server/compute/docker/__init__.py.orig
new file mode 100644
index 00000000..22d88125
--- /dev/null
+++ b/gns3server/compute/docker/__init__.py.orig
@@ -0,0 +1,248 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2015 GNS3 Technologies Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""
+Docker server module.
+"""
+
+import sys
+import json
+import asyncio
+import logging
+import aiohttp
+from gns3server.utils import parse_version
+from gns3server.utils.asyncio import locked_coroutine
+from gns3server.compute.base_manager import BaseManager
+from gns3server.compute.docker.docker_vm import DockerVM
+from gns3server.compute.docker.docker_error import DockerError, DockerHttp304Error, DockerHttp404Error
+
+log = logging.getLogger(__name__)
+
+
+# Be carefull to keep it consistent
+DOCKER_MINIMUM_API_VERSION = "1.25"
+DOCKER_MINIMUM_VERSION = "1.13"
+DOCKER_PREFERRED_API_VERSION = "1.30"
+
+
+class Docker(BaseManager):
+
+    _NODE_CLASS = DockerVM
+
+    def __init__(self):
+        super().__init__()
+        self._server_url = '/var/run/docker.sock'
+        self._connected = False
+        # Allow locking during ubridge operations
+        self.ubridge_lock = asyncio.Lock()
+        self._connector = None
+        self._session = None
+        self._api_version = DOCKER_MINIMUM_API_VERSION
+
+    @asyncio.coroutine
+    def _check_connection(self):
+        if not self._connected:
+            try:
+                self._connected = True
+                connector = self.connector()
+                version = yield from self.query("GET", "version")
+            except (aiohttp.ClientOSError, FileNotFoundError):
+                self._connected = False
+                raise DockerError("Can't connect to docker daemon")
+
+            docker_version = parse_version(version['ApiVersion'])
+
+            if docker_version < parse_version(DOCKER_MINIMUM_API_VERSION):
+                raise DockerError(
+                    "Docker version is {}. GNS3 requires a minimum version of {}".format(
+                        version["Version"], DOCKER_MINIMUM_VERSION))
+
+            preferred_api_version = parse_version(DOCKER_PREFERRED_API_VERSION)
+            if docker_version >= preferred_api_version:
+                self._api_version = DOCKER_PREFERRED_API_VERSION
+
+    def connector(self):
+        if self._connector is None or self._connector.closed:
+            if not sys.platform.startswith("linux"):
+                raise DockerError("Docker is supported only on Linux")
+            try:
+                self._connector = aiohttp.connector.UnixConnector(self._server_url, limit=None)
+            except (aiohttp.ClientOSError, FileNotFoundError):
+                raise DockerError("Can't connect to docker daemon")
+        return self._connector
+
+    @asyncio.coroutine
+    def unload(self):
+        yield from super().unload()
+        if self._connected:
+            if self._connector and not self._connector.closed:
+                self._connector.close()
+
+    @asyncio.coroutine
+    def query(self, method, path, data={}, params={}):
+        """
+        Make a query to the docker daemon and decode the request
+
+        :param method: HTTP method
+        :param path: Endpoint in API
+        :param data: Dictionnary with the body. Will be transformed to a JSON
+        :param params: Parameters added as a query arg
+        """
+
+        response = yield from self.http_query(method, path, data=data, params=params)
+        body = yield from response.read()
+        if body and len(body):
+            if response.headers['CONTENT-TYPE'] == 'application/json':
+                body = json.loads(body.decode("utf-8"))
+            else:
+                body = body.decode("utf-8")
+        log.debug("Query Docker %s %s params=%s data=%s Response: %s", method, path, params, data, body)
+        return body
+
+    @asyncio.coroutine
+    def http_query(self, method, path, data={}, params={}, timeout=300):
+        """
+        Make a query to the docker daemon
+
+        :param method: HTTP method
+        :param path: Endpoint in API
+        :param data: Dictionnary with the body. Will be transformed to a JSON
+        :param params: Parameters added as a query arg
+        :param timeout: Timeout
+        :returns: HTTP response
+        """
+        data = json.dumps(data)
+        if timeout is None:
+            timeout = 60 * 60 * 24 * 31  # One month timeout
+
+        if path == 'version':
+            url = "http://docker/v1.12/" + path         # API of docker v1.0
+        else:
+            url = "http://docker/v" + DOCKER_MINIMUM_API_VERSION + "/" + path
+        try:
+            if path != "version":  # version is use by check connection
+                yield from self._check_connection()
+            if self._session is None or self._session.closed:
+                connector = self.connector()
+                self._session = aiohttp.ClientSession(connector=connector)
+            response = yield from self._session.request(
+                method,
+                url,
+                params=params,
+                data=data,
+                headers={"content-type": "application/json", },
+                timeout=timeout
+            )
+        except (aiohttp.ClientResponseError, aiohttp.ClientOSError) as e:
+            raise DockerError("Docker has returned an error: {}".format(str(e)))
+        except (asyncio.TimeoutError):
+            raise DockerError("Docker timeout " + method + " " + path)
+        if response.status >= 300:
+            body = yield from response.read()
+            try:
+                body = json.loads(body.decode("utf-8"))["message"]
+            except ValueError:
+                pass
+            log.debug("Query Docker %s %s params=%s data=%s Response: %s", method, path, params, data, body)
+            if response.status == 304:
+                raise DockerHttp304Error("Docker has returned an error: {} {}".format(response.status, body))
+            elif response.status == 404:
+                raise DockerHttp404Error("Docker has returned an error: {} {}".format(response.status, body))
+            else:
+                raise DockerError("Docker has returned an error: {} {}".format(response.status, body))
+        return response
+
+    @asyncio.coroutine
+    def websocket_query(self, path, params={}):
+        """
+        Open a websocket connection
+
+        :param path: Endpoint in API
+        :param params: Parameters added as a query arg
+        :returns: Websocket
+        """
+
+<<<<<<< HEAD
+        url = "http://docker/v" + DOCKER_MINIMUM_API_VERSION + "/" + path
+        connection = yield from self._session.ws_connect(url,
+                                                         origin="http://docker",
+                                                         autoping=True)
+=======
+        url = "http://docker/v" + self._api_version + "/" + path
+        connection = yield from aiohttp.ws_connect(url,
+                                                   connector=self.connector(),
+                                                   origin="http://docker",
+                                                   autoping=True)
+>>>>>>> master
+        return connection
+
+    @locked_coroutine
+    def pull_image(self, image, progress_callback=None):
+        """
+        Pull image from docker repository
+
+        :params image: Image name
+        :params progress_callback: A function that receive a log message about image download progress
+        """
+
+        try:
+            yield from self.query("GET", "images/{}/json".format(image))
+            return  # We already have the image skip the download
+        except DockerHttp404Error:
+            pass
+
+        if progress_callback:
+            progress_callback("Pull {} from docker hub".format(image))
+        response = yield from self.http_query("POST", "images/create", params={"fromImage": image}, timeout=None)
+        # The pull api will stream status via an HTTP JSON stream
+        content = ""
+        while True:
+            try:
+                chunk = yield from response.content.read(1024)
+            except aiohttp.ServerDisconnectedError:
+                break
+            if not chunk:
+                break
+            content += chunk.decode("utf-8")
+
+            try:
+                while True:
+                    content = content.lstrip(" \r\n\t")
+                    answer, index = json.JSONDecoder().raw_decode(content)
+                    if "progress" in answer and progress_callback:
+                        progress_callback("Pulling image {}:{}: {}".format(image, answer["id"], answer["progress"]))
+                    content = content[index:]
+            except ValueError:  # Partial JSON
+                pass
+        response.close()
+        if progress_callback:
+            progress_callback("Success pulling image {}".format(image))
+
+    @asyncio.coroutine
+    def list_images(self):
+        """Gets Docker image list.
+
+        :returns: list of dicts
+        :rtype: list
+        """
+        images = []
+        for image in (yield from self.query("GET", "images/json", params={"all": 0})):
+            if image['RepoTags']:
+                for tag in image['RepoTags']:
+                    if tag != "<none>:<none>":
+                        images.append({'image': tag})
+        return sorted(images, key=lambda i: i['image'])
diff --git a/gns3server/compute/docker/docker_vm.py b/gns3server/compute/docker/docker_vm.py
index 00b80b0a..1c5fcf7b 100644
--- a/gns3server/compute/docker/docker_vm.py
+++ b/gns3server/compute/docker/docker_vm.py
@@ -502,6 +502,10 @@ class DockerVM(BaseNode):
             msg = yield from ws.receive()
             if msg.tp == aiohttp.WSMsgType.text:
                 out.feed_data(msg.data.encode())
+            elif msg.tp == aiohttp.WSMsgType.BINARY:
+                out.feed_data(msg.data)
+            elif msg.tp == aiohttp.WSMsgType.ERROR:
+                log.critical("Docker WebSocket Error: {}".format(msg.data))
             else:
                 out.feed_eof()
                 ws.close()
diff --git a/gns3server/compute/iou/iou_vm.py b/gns3server/compute/iou/iou_vm.py
index 4d12122c..d1264ca3 100644
--- a/gns3server/compute/iou/iou_vm.py
+++ b/gns3server/compute/iou/iou_vm.py
@@ -182,9 +182,9 @@ class IOUVM(BaseNode):
         except OSError as e:
             raise IOUError("Cannot read ELF header for IOU image '{}': {}".format(self._path, e))
 
-        # IOU images must start with the ELF magic number, be 32-bit, little endian
+        # IOU images must start with the ELF magic number, be 32-bit or 64-bit, little endian
         # and have an ELF version of 1 normal IOS image are big endian!
-        if elf_header_start != b'\x7fELF\x01\x01\x01':
+        if elf_header_start != b'\x7fELF\x01\x01\x01' and elf_header_start != b'\x7fELF\x02\x01\x01':
             raise IOUError("'{}' is not a valid IOU image".format(self._path))
 
         if not os.access(self._path, os.X_OK):
diff --git a/gns3server/controller/project.py b/gns3server/controller/project.py
index 6936e95c..3f396770 100644
--- a/gns3server/controller/project.py
+++ b/gns3server/controller/project.py
@@ -612,6 +612,9 @@ class Project:
         :param name: Name of the snapshot
         """
 
+        if name in [snap.name for snap in self.snapshots.values()]:
+            raise aiohttp.web_exceptions.HTTPConflict(text="The snapshot {} already exist".format(name))
+
         snapshot = Snapshot(self, name=name)
         try:
             if os.path.exists(snapshot.path):
diff --git a/tests/compute/docker/test_docker.py b/tests/compute/docker/test_docker.py
index 095a25de..db43c84c 100644
--- a/tests/compute/docker/test_docker.py
+++ b/tests/compute/docker/test_docker.py
@@ -17,10 +17,10 @@
 
 import pytest
 import asyncio
-from unittest.mock import MagicMock
+from unittest.mock import MagicMock, patch
 
 from tests.utils import asyncio_patch, AsyncioMagicMock
-from gns3server.compute.docker import Docker
+from gns3server.compute.docker import Docker, DOCKER_PREFERRED_API_VERSION, DOCKER_MINIMUM_API_VERSION
 from gns3server.compute.docker.docker_error import DockerError, DockerHttp404Error
 
 
@@ -162,3 +162,40 @@ def test_pull_image(loop):
         with asyncio_patch("gns3server.compute.docker.Docker.http_query", return_value=mock_query) as mock:
             images = loop.run_until_complete(asyncio.async(Docker.instance().pull_image("ubuntu")))
             mock.assert_called_with("POST", "images/create", params={"fromImage": "ubuntu"}, timeout=None)
+
+
+def test_docker_check_connection_docker_minimum_version(vm, loop):
+    response = {
+        'ApiVersion': '1.01',
+        'Version': '1.12'
+    }
+
+    with patch("gns3server.compute.docker.Docker.connector"), \
+        asyncio_patch("gns3server.compute.docker.Docker.query", return_value=response):
+        vm._connected = False
+        with pytest.raises(DockerError):
+            loop.run_until_complete(asyncio.async(vm._check_connection()))
+
+
+def test_docker_check_connection_docker_preferred_version_against_newer(vm, loop):
+    response = {
+        'ApiVersion': '1.31'
+    }
+
+    with patch("gns3server.compute.docker.Docker.connector"), \
+        asyncio_patch("gns3server.compute.docker.Docker.query", return_value=response):
+        vm._connected = False
+        loop.run_until_complete(asyncio.async(vm._check_connection()))
+        assert vm._api_version == DOCKER_PREFERRED_API_VERSION
+
+
+def test_docker_check_connection_docker_preferred_version_against_older(vm, loop):
+    response = {
+        'ApiVersion': '1.27',
+    }
+
+    with patch("gns3server.compute.docker.Docker.connector"), \
+        asyncio_patch("gns3server.compute.docker.Docker.query", return_value=response):
+        vm._connected = False
+        loop.run_until_complete(asyncio.async(vm._check_connection()))
+        assert vm._api_version == DOCKER_MINIMUM_API_VERSION
\ No newline at end of file
diff --git a/tests/compute/docker/test_docker_vm.py b/tests/compute/docker/test_docker_vm.py
index 6ca6fd14..e6610ebc 100644
--- a/tests/compute/docker/test_docker_vm.py
+++ b/tests/compute/docker/test_docker_vm.py
@@ -15,6 +15,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import aiohttp
 import asyncio
 import pytest
 import uuid
@@ -904,3 +905,27 @@ def test_fix_permission(vm, loop):
         loop.run_until_complete(vm._fix_permissions())
     mock_exec.assert_called_with('docker', 'exec', 'e90e34656842', '/gns3/bin/busybox', 'sh', '-c', '(/gns3/bin/busybox find "/etc" -depth -print0 | /gns3/bin/busybox xargs -0 /gns3/bin/busybox stat -c \'%a:%u:%g:%n\' > "/etc/.gns3_perms") && /gns3/bin/busybox chmod -R u+rX "/etc" && /gns3/bin/busybox chown {}:{} -R "/etc"'.format(os.getuid(), os.getgid()))
     assert process.wait.called
+
+
+def test_read_console_output_with_binary_mode(vm, loop):
+    class InputStreamMock(object):
+        def __init__(self):
+            self.sent = False
+
+        @asyncio.coroutine
+        def receive(self):
+            if not self.sent:
+                self.sent = True
+                return MagicMock(tp=aiohttp.WSMsgType.BINARY, data=b"test")
+            else:
+                return MagicMock(tp=aiohttp.WSMsgType.CLOSE)
+
+        def close(self):
+            pass
+
+    input_stream = InputStreamMock()
+    output_stream = MagicMock()
+
+    with asyncio_patch('gns3server.compute.docker.docker_vm.DockerVM.stop'):
+        loop.run_until_complete(asyncio.async(vm._read_console_output(input_stream, output_stream)))
+        output_stream.feed_data.assert_called_once_with(b"test")