@@ -31,12 +31,22 @@ func (daemon *Daemon) ContainerStart(name string, hostConfig *containertypes.Hos

 		// creating a container, not during start.

 		if hostConfig != nil {

 			logrus.Warn("DEPRECATED: Setting host configuration options when the container starts is deprecated and will be removed in Docker 1.12")

+			oldNetworkMode := container.HostConfig.NetworkMode

 			if err := daemon.setSecurityOptions(container, hostConfig); err != nil {

 				return err

 			}

 			if err := daemon.setHostConfig(container, hostConfig); err != nil {

 				return err

 			}

+			newNetworkMode := container.HostConfig.NetworkMode

+			if string(oldNetworkMode) != string(newNetworkMode) {

+				// if user has change the network mode on starting, clean up the

+				// old networks. It is a deprecated feature and will be removed in Docker 1.12

+				container.NetworkSettings.Networks = nil

+				if err := container.ToDisk(); err != nil {

+					return err

+				}

+			}

 			container.InitDNSHostConfig()

 		}

 	} else {

@@ -940,7 +940,7 @@ func (s *DockerNetworkSuite) TestDockerNetworkInspectCreatedContainer(c *check.C

 	c.Assert(networks, checker.Contains, "bridge", check.Commentf("Should return 'bridge' network"))

 }

-func (s *DockerNetworkSuite) TestDockerNetworkRestartWithMulipleNetworks(c *check.C) {

+func (s *DockerNetworkSuite) TestDockerNetworkRestartWithMultipleNetworks(c *check.C) {

 	dockerCmd(c, "network", "create", "test")

 	dockerCmd(c, "run", "--name=foo", "-d", "busybox", "top")

 	c.Assert(waitRun("foo"), checker.IsNil)

@@ -1097,3 +1097,46 @@ func (s *DockerSuite) TestUserDefinedNetworkConnectDisconnectLink(c *check.C) {

 	_, _, err = dockerCmdWithError("exec", "second", "ping", "-c", "1", "FirstInFoo2")

 	c.Assert(err, check.IsNil)

 }

+

+// #19100 This is a deprecated feature test, it should be remove in Docker 1.12

+func (s *DockerNetworkSuite) TestDockerNetworkStartAPIWithHostconfig(c *check.C) {

+	netName := "test"

+	conName := "foo"

+	dockerCmd(c, "network", "create", netName)

+	dockerCmd(c, "create", "--name", conName, "busybox", "top")

+

+	config := map[string]interface{}{

+		"HostConfig": map[string]interface{}{

+			"NetworkMode": netName,

+		},

+	}

+	_, _, err := sockRequest("POST", "/containers/"+conName+"/start", config)

+	c.Assert(err, checker.IsNil)

+	c.Assert(waitRun(conName), checker.IsNil)

+	networks, err := inspectField(conName, "NetworkSettings.Networks")

+	c.Assert(err, checker.IsNil)

+	c.Assert(networks, checker.Contains, netName, check.Commentf(fmt.Sprintf("Should contain '%s' network", netName)))

+	c.Assert(networks, checker.Not(checker.Contains), "bridge", check.Commentf("Should not contain 'bridge' network"))

+}

+

+func (s *DockerNetworkSuite) TestDockerNetworkDisconnectDefault(c *check.C) {

+	netWorkName1 := "test1"

+	netWorkName2 := "test2"

+	containerName := "foo"

+

+	dockerCmd(c, "network", "create", netWorkName1)

+	dockerCmd(c, "network", "create", netWorkName2)

+	dockerCmd(c, "create", "--name", containerName, "busybox", "top")

+	dockerCmd(c, "network", "connect", netWorkName1, containerName)

+	dockerCmd(c, "network", "connect", netWorkName2, containerName)

+	dockerCmd(c, "network", "disconnect", "bridge", containerName)

+

+	dockerCmd(c, "start", containerName)

+	c.Assert(waitRun(containerName), checker.IsNil)

+	networks, err := inspectField(containerName, "NetworkSettings.Networks")

+	c.Assert(err, checker.IsNil)

+	c.Assert(networks, checker.Contains, netWorkName1, check.Commentf(fmt.Sprintf("Should contain '%s' network", netWorkName1)))

+	c.Assert(networks, checker.Contains, netWorkName2, check.Commentf(fmt.Sprintf("Should contain '%s' network", netWorkName2)))

+	c.Assert(networks, checker.Not(checker.Contains), "bridge", check.Commentf("Should not contain 'bridge' network"))

+

+}