diff --git a/api/services/tasks/v1/tasks.pb.go b/api/services/tasks/v1/tasks.pb.go
index a6e60108c..1b6513899 100644
--- a/api/services/tasks/v1/tasks.pb.go
+++ b/api/services/tasks/v1/tasks.pb.go
@@ -11,7 +11,8 @@
 	It has these top-level messages:
 		CreateTaskRequest
 		CreateTaskResponse
-		StartTaskRequest
+		StartRequest
+		StartResponse
 		DeleteTaskRequest
 		DeleteResponse
 		DeleteProcessRequest
@@ -102,13 +103,22 @@ func (m *CreateTaskResponse) Reset()                    { *m = CreateTaskRespons
 func (*CreateTaskResponse) ProtoMessage()               {}
 func (*CreateTaskResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{1} }
 
-type StartTaskRequest struct {
+type StartRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
+	ExecID      string `protobuf:"bytes,2,opt,name=exec_id,json=execId,proto3" json:"exec_id,omitempty"`
 }
 
-func (m *StartTaskRequest) Reset()                    { *m = StartTaskRequest{} }
-func (*StartTaskRequest) ProtoMessage()               {}
-func (*StartTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{2} }
+func (m *StartRequest) Reset()                    { *m = StartRequest{} }
+func (*StartRequest) ProtoMessage()               {}
+func (*StartRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{2} }
+
+type StartResponse struct {
+	Pid uint32 `protobuf:"varint,1,opt,name=pid,proto3" json:"pid,omitempty"`
+}
+
+func (m *StartResponse) Reset()                    { *m = StartResponse{} }
+func (*StartResponse) ProtoMessage()               {}
+func (*StartResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{3} }
 
 type DeleteTaskRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -116,7 +126,7 @@ type DeleteTaskRequest struct {
 
 func (m *DeleteTaskRequest) Reset()                    { *m = DeleteTaskRequest{} }
 func (*DeleteTaskRequest) ProtoMessage()               {}
-func (*DeleteTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{3} }
+func (*DeleteTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{4} }
 
 type DeleteResponse struct {
 	ID         string    `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
@@ -127,7 +137,7 @@ type DeleteResponse struct {
 
 func (m *DeleteResponse) Reset()                    { *m = DeleteResponse{} }
 func (*DeleteResponse) ProtoMessage()               {}
-func (*DeleteResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{4} }
+func (*DeleteResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{5} }
 
 type DeleteProcessRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -136,7 +146,7 @@ type DeleteProcessRequest struct {
 
 func (m *DeleteProcessRequest) Reset()                    { *m = DeleteProcessRequest{} }
 func (*DeleteProcessRequest) ProtoMessage()               {}
-func (*DeleteProcessRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{5} }
+func (*DeleteProcessRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{6} }
 
 type GetTaskRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -144,7 +154,7 @@ type GetTaskRequest struct {
 
 func (m *GetTaskRequest) Reset()                    { *m = GetTaskRequest{} }
 func (*GetTaskRequest) ProtoMessage()               {}
-func (*GetTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{6} }
+func (*GetTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{7} }
 
 type GetTaskResponse struct {
 	Task *containerd_v1_types.Task `protobuf:"bytes,1,opt,name=task" json:"task,omitempty"`
@@ -152,7 +162,7 @@ type GetTaskResponse struct {
 
 func (m *GetTaskResponse) Reset()                    { *m = GetTaskResponse{} }
 func (*GetTaskResponse) ProtoMessage()               {}
-func (*GetTaskResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{7} }
+func (*GetTaskResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{8} }
 
 type ListTasksRequest struct {
 	Filter string `protobuf:"bytes,1,opt,name=filter,proto3" json:"filter,omitempty"`
@@ -160,7 +170,7 @@ type ListTasksRequest struct {
 
 func (m *ListTasksRequest) Reset()                    { *m = ListTasksRequest{} }
 func (*ListTasksRequest) ProtoMessage()               {}
-func (*ListTasksRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{8} }
+func (*ListTasksRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{9} }
 
 type ListTasksResponse struct {
 	Tasks []*containerd_v1_types.Task `protobuf:"bytes,1,rep,name=tasks" json:"tasks,omitempty"`
@@ -168,7 +178,7 @@ type ListTasksResponse struct {
 
 func (m *ListTasksResponse) Reset()                    { *m = ListTasksResponse{} }
 func (*ListTasksResponse) ProtoMessage()               {}
-func (*ListTasksResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{9} }
+func (*ListTasksResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{10} }
 
 type KillRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -179,7 +189,7 @@ type KillRequest struct {
 
 func (m *KillRequest) Reset()                    { *m = KillRequest{} }
 func (*KillRequest) ProtoMessage()               {}
-func (*KillRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{10} }
+func (*KillRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{11} }
 
 type ExecProcessRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -197,15 +207,14 @@ type ExecProcessRequest struct {
 
 func (m *ExecProcessRequest) Reset()                    { *m = ExecProcessRequest{} }
 func (*ExecProcessRequest) ProtoMessage()               {}
-func (*ExecProcessRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{11} }
+func (*ExecProcessRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{12} }
 
 type ExecProcessResponse struct {
-	Pid uint32 `protobuf:"varint,1,opt,name=pid,proto3" json:"pid,omitempty"`
 }
 
 func (m *ExecProcessResponse) Reset()                    { *m = ExecProcessResponse{} }
 func (*ExecProcessResponse) ProtoMessage()               {}
-func (*ExecProcessResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{12} }
+func (*ExecProcessResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{13} }
 
 type ResizePtyRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -216,7 +225,7 @@ type ResizePtyRequest struct {
 
 func (m *ResizePtyRequest) Reset()                    { *m = ResizePtyRequest{} }
 func (*ResizePtyRequest) ProtoMessage()               {}
-func (*ResizePtyRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{13} }
+func (*ResizePtyRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{14} }
 
 type CloseIORequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -226,7 +235,7 @@ type CloseIORequest struct {
 
 func (m *CloseIORequest) Reset()                    { *m = CloseIORequest{} }
 func (*CloseIORequest) ProtoMessage()               {}
-func (*CloseIORequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{14} }
+func (*CloseIORequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{15} }
 
 type PauseTaskRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -234,7 +243,7 @@ type PauseTaskRequest struct {
 
 func (m *PauseTaskRequest) Reset()                    { *m = PauseTaskRequest{} }
 func (*PauseTaskRequest) ProtoMessage()               {}
-func (*PauseTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{15} }
+func (*PauseTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{16} }
 
 type ResumeTaskRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -242,7 +251,7 @@ type ResumeTaskRequest struct {
 
 func (m *ResumeTaskRequest) Reset()                    { *m = ResumeTaskRequest{} }
 func (*ResumeTaskRequest) ProtoMessage()               {}
-func (*ResumeTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{16} }
+func (*ResumeTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{17} }
 
 type ListPidsRequest struct {
 	ContainerID string `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -250,7 +259,7 @@ type ListPidsRequest struct {
 
 func (m *ListPidsRequest) Reset()                    { *m = ListPidsRequest{} }
 func (*ListPidsRequest) ProtoMessage()               {}
-func (*ListPidsRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{17} }
+func (*ListPidsRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{18} }
 
 type ListPidsResponse struct {
 	Pids []uint32 `protobuf:"varint,1,rep,packed,name=pids" json:"pids,omitempty"`
@@ -258,7 +267,7 @@ type ListPidsResponse struct {
 
 func (m *ListPidsResponse) Reset()                    { *m = ListPidsResponse{} }
 func (*ListPidsResponse) ProtoMessage()               {}
-func (*ListPidsResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{18} }
+func (*ListPidsResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{19} }
 
 type CheckpointTaskRequest struct {
 	ContainerID      string                                     `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -268,7 +277,7 @@ type CheckpointTaskRequest struct {
 
 func (m *CheckpointTaskRequest) Reset()                    { *m = CheckpointTaskRequest{} }
 func (*CheckpointTaskRequest) ProtoMessage()               {}
-func (*CheckpointTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{19} }
+func (*CheckpointTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{20} }
 
 type CheckpointTaskResponse struct {
 	Descriptors []*containerd_types1.Descriptor `protobuf:"bytes,1,rep,name=descriptors" json:"descriptors,omitempty"`
@@ -276,7 +285,7 @@ type CheckpointTaskResponse struct {
 
 func (m *CheckpointTaskResponse) Reset()                    { *m = CheckpointTaskResponse{} }
 func (*CheckpointTaskResponse) ProtoMessage()               {}
-func (*CheckpointTaskResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{20} }
+func (*CheckpointTaskResponse) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{21} }
 
 type UpdateTaskRequest struct {
 	ContainerID string                `protobuf:"bytes,1,opt,name=container_id,json=containerId,proto3" json:"container_id,omitempty"`
@@ -285,12 +294,13 @@ type UpdateTaskRequest struct {
 
 func (m *UpdateTaskRequest) Reset()                    { *m = UpdateTaskRequest{} }
 func (*UpdateTaskRequest) ProtoMessage()               {}
-func (*UpdateTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{21} }
+func (*UpdateTaskRequest) Descriptor() ([]byte, []int) { return fileDescriptorTasks, []int{22} }
 
 func init() {
 	proto.RegisterType((*CreateTaskRequest)(nil), "containerd.services.tasks.v1.CreateTaskRequest")
 	proto.RegisterType((*CreateTaskResponse)(nil), "containerd.services.tasks.v1.CreateTaskResponse")
-	proto.RegisterType((*StartTaskRequest)(nil), "containerd.services.tasks.v1.StartTaskRequest")
+	proto.RegisterType((*StartRequest)(nil), "containerd.services.tasks.v1.StartRequest")
+	proto.RegisterType((*StartResponse)(nil), "containerd.services.tasks.v1.StartResponse")
 	proto.RegisterType((*DeleteTaskRequest)(nil), "containerd.services.tasks.v1.DeleteTaskRequest")
 	proto.RegisterType((*DeleteResponse)(nil), "containerd.services.tasks.v1.DeleteResponse")
 	proto.RegisterType((*DeleteProcessRequest)(nil), "containerd.services.tasks.v1.DeleteProcessRequest")
@@ -325,8 +335,8 @@ const _ = grpc.SupportPackageIsVersion4
 type TasksClient interface {
 	// Create a task.
 	Create(ctx context.Context, in *CreateTaskRequest, opts ...grpc.CallOption) (*CreateTaskResponse, error)
-	// Start a task.
-	Start(ctx context.Context, in *StartTaskRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
+	// Start a process.
+	Start(ctx context.Context, in *StartRequest, opts ...grpc.CallOption) (*StartResponse, error)
 	// Delete a task and on disk state.
 	Delete(ctx context.Context, in *DeleteTaskRequest, opts ...grpc.CallOption) (*DeleteResponse, error)
 	DeleteProcess(ctx context.Context, in *DeleteProcessRequest, opts ...grpc.CallOption) (*DeleteResponse, error)
@@ -334,7 +344,7 @@ type TasksClient interface {
 	List(ctx context.Context, in *ListTasksRequest, opts ...grpc.CallOption) (*ListTasksResponse, error)
 	// Kill a task or process.
 	Kill(ctx context.Context, in *KillRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
-	Exec(ctx context.Context, in *ExecProcessRequest, opts ...grpc.CallOption) (*ExecProcessResponse, error)
+	Exec(ctx context.Context, in *ExecProcessRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
 	ResizePty(ctx context.Context, in *ResizePtyRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
 	CloseIO(ctx context.Context, in *CloseIORequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
 	Pause(ctx context.Context, in *PauseTaskRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error)
@@ -361,8 +371,8 @@ func (c *tasksClient) Create(ctx context.Context, in *CreateTaskRequest, opts ..
 	return out, nil
 }
 
-func (c *tasksClient) Start(ctx context.Context, in *StartTaskRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error) {
-	out := new(google_protobuf.Empty)
+func (c *tasksClient) Start(ctx context.Context, in *StartRequest, opts ...grpc.CallOption) (*StartResponse, error) {
+	out := new(StartResponse)
 	err := grpc.Invoke(ctx, "/containerd.services.tasks.v1.Tasks/Start", in, out, c.cc, opts...)
 	if err != nil {
 		return nil, err
@@ -415,8 +425,8 @@ func (c *tasksClient) Kill(ctx context.Context, in *KillRequest, opts ...grpc.Ca
 	return out, nil
 }
 
-func (c *tasksClient) Exec(ctx context.Context, in *ExecProcessRequest, opts ...grpc.CallOption) (*ExecProcessResponse, error) {
-	out := new(ExecProcessResponse)
+func (c *tasksClient) Exec(ctx context.Context, in *ExecProcessRequest, opts ...grpc.CallOption) (*google_protobuf.Empty, error) {
+	out := new(google_protobuf.Empty)
 	err := grpc.Invoke(ctx, "/containerd.services.tasks.v1.Tasks/Exec", in, out, c.cc, opts...)
 	if err != nil {
 		return nil, err
@@ -492,8 +502,8 @@ func (c *tasksClient) Update(ctx context.Context, in *UpdateTaskRequest, opts ..
 type TasksServer interface {
 	// Create a task.
 	Create(context.Context, *CreateTaskRequest) (*CreateTaskResponse, error)
-	// Start a task.
-	Start(context.Context, *StartTaskRequest) (*google_protobuf.Empty, error)
+	// Start a process.
+	Start(context.Context, *StartRequest) (*StartResponse, error)
 	// Delete a task and on disk state.
 	Delete(context.Context, *DeleteTaskRequest) (*DeleteResponse, error)
 	DeleteProcess(context.Context, *DeleteProcessRequest) (*DeleteResponse, error)
@@ -501,7 +511,7 @@ type TasksServer interface {
 	List(context.Context, *ListTasksRequest) (*ListTasksResponse, error)
 	// Kill a task or process.
 	Kill(context.Context, *KillRequest) (*google_protobuf.Empty, error)
-	Exec(context.Context, *ExecProcessRequest) (*ExecProcessResponse, error)
+	Exec(context.Context, *ExecProcessRequest) (*google_protobuf.Empty, error)
 	ResizePty(context.Context, *ResizePtyRequest) (*google_protobuf.Empty, error)
 	CloseIO(context.Context, *CloseIORequest) (*google_protobuf.Empty, error)
 	Pause(context.Context, *PauseTaskRequest) (*google_protobuf.Empty, error)
@@ -534,7 +544,7 @@ func _Tasks_Create_Handler(srv interface{}, ctx context.Context, dec func(interf
 }
 
 func _Tasks_Start_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(StartTaskRequest)
+	in := new(StartRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
@@ -546,7 +556,7 @@ func _Tasks_Start_Handler(srv interface{}, ctx context.Context, dec func(interfa
 		FullMethod: "/containerd.services.tasks.v1.Tasks/Start",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(TasksServer).Start(ctx, req.(*StartTaskRequest))
+		return srv.(TasksServer).Start(ctx, req.(*StartRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -967,7 +977,7 @@ func (m *CreateTaskResponse) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
-func (m *StartTaskRequest) Marshal() (dAtA []byte, err error) {
+func (m *StartRequest) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
 	dAtA = make([]byte, size)
 	n, err := m.MarshalTo(dAtA)
@@ -977,7 +987,7 @@ func (m *StartTaskRequest) Marshal() (dAtA []byte, err error) {
 	return dAtA[:n], nil
 }
 
-func (m *StartTaskRequest) MarshalTo(dAtA []byte) (int, error) {
+func (m *StartRequest) MarshalTo(dAtA []byte) (int, error) {
 	var i int
 	_ = i
 	var l int
@@ -988,6 +998,35 @@ func (m *StartTaskRequest) MarshalTo(dAtA []byte) (int, error) {
 		i = encodeVarintTasks(dAtA, i, uint64(len(m.ContainerID)))
 		i += copy(dAtA[i:], m.ContainerID)
 	}
+	if len(m.ExecID) > 0 {
+		dAtA[i] = 0x12
+		i++
+		i = encodeVarintTasks(dAtA, i, uint64(len(m.ExecID)))
+		i += copy(dAtA[i:], m.ExecID)
+	}
+	return i, nil
+}
+
+func (m *StartResponse) Marshal() (dAtA []byte, err error) {
+	size := m.Size()
+	dAtA = make([]byte, size)
+	n, err := m.MarshalTo(dAtA)
+	if err != nil {
+		return nil, err
+	}
+	return dAtA[:n], nil
+}
+
+func (m *StartResponse) MarshalTo(dAtA []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.Pid != 0 {
+		dAtA[i] = 0x8
+		i++
+		i = encodeVarintTasks(dAtA, i, uint64(m.Pid))
+	}
 	return i, nil
 }
 
@@ -1321,11 +1360,6 @@ func (m *ExecProcessResponse) MarshalTo(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
-	if m.Pid != 0 {
-		dAtA[i] = 0x8
-		i++
-		i = encodeVarintTasks(dAtA, i, uint64(m.Pid))
-	}
 	return i, nil
 }
 
@@ -1699,13 +1733,26 @@ func (m *CreateTaskResponse) Size() (n int) {
 	return n
 }
 
-func (m *StartTaskRequest) Size() (n int) {
+func (m *StartRequest) Size() (n int) {
 	var l int
 	_ = l
 	l = len(m.ContainerID)
 	if l > 0 {
 		n += 1 + l + sovTasks(uint64(l))
 	}
+	l = len(m.ExecID)
+	if l > 0 {
+		n += 1 + l + sovTasks(uint64(l))
+	}
+	return n
+}
+
+func (m *StartResponse) Size() (n int) {
+	var l int
+	_ = l
+	if m.Pid != 0 {
+		n += 1 + sovTasks(uint64(m.Pid))
+	}
 	return n
 }
 
@@ -1849,9 +1896,6 @@ func (m *ExecProcessRequest) Size() (n int) {
 func (m *ExecProcessResponse) Size() (n int) {
 	var l int
 	_ = l
-	if m.Pid != 0 {
-		n += 1 + sovTasks(uint64(m.Pid))
-	}
 	return n
 }
 
@@ -2020,12 +2064,23 @@ func (this *CreateTaskResponse) String() string {
 	}, "")
 	return s
 }
-func (this *StartTaskRequest) String() string {
+func (this *StartRequest) String() string {
 	if this == nil {
 		return "nil"
 	}
-	s := strings.Join([]string{`&StartTaskRequest{`,
+	s := strings.Join([]string{`&StartRequest{`,
 		`ContainerID:` + fmt.Sprintf("%v", this.ContainerID) + `,`,
+		`ExecID:` + fmt.Sprintf("%v", this.ExecID) + `,`,
+		`}`,
+	}, "")
+	return s
+}
+func (this *StartResponse) String() string {
+	if this == nil {
+		return "nil"
+	}
+	s := strings.Join([]string{`&StartResponse{`,
+		`Pid:` + fmt.Sprintf("%v", this.Pid) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -2138,7 +2193,6 @@ func (this *ExecProcessResponse) String() string {
 		return "nil"
 	}
 	s := strings.Join([]string{`&ExecProcessResponse{`,
-		`Pid:` + fmt.Sprintf("%v", this.Pid) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -2630,7 +2684,7 @@ func (m *CreateTaskResponse) Unmarshal(dAtA []byte) error {
 	}
 	return nil
 }
-func (m *StartTaskRequest) Unmarshal(dAtA []byte) error {
+func (m *StartRequest) Unmarshal(dAtA []byte) error {
 	l := len(dAtA)
 	iNdEx := 0
 	for iNdEx < l {
@@ -2653,10 +2707,10 @@ func (m *StartTaskRequest) Unmarshal(dAtA []byte) error {
 		fieldNum := int32(wire >> 3)
 		wireType := int(wire & 0x7)
 		if wireType == 4 {
-			return fmt.Errorf("proto: StartTaskRequest: wiretype end group for non-group")
+			return fmt.Errorf("proto: StartRequest: wiretype end group for non-group")
 		}
 		if fieldNum <= 0 {
-			return fmt.Errorf("proto: StartTaskRequest: illegal tag %d (wire type %d)", fieldNum, wire)
+			return fmt.Errorf("proto: StartRequest: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
 		case 1:
@@ -2688,6 +2742,104 @@ func (m *StartTaskRequest) Unmarshal(dAtA []byte) error {
 			}
 			m.ContainerID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ExecID", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTasks
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthTasks
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.ExecID = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipTasks(dAtA[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthTasks
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
+func (m *StartResponse) Unmarshal(dAtA []byte) error {
+	l := len(dAtA)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowTasks
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := dAtA[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: StartResponse: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: StartResponse: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Pid", wireType)
+			}
+			m.Pid = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTasks
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.Pid |= (uint32(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTasks(dAtA[iNdEx:])
@@ -3789,25 +3941,6 @@ func (m *ExecProcessResponse) Unmarshal(dAtA []byte) error {
 			return fmt.Errorf("proto: ExecProcessResponse: illegal tag %d (wire type %d)", fieldNum, wire)
 		}
 		switch fieldNum {
-		case 1:
-			if wireType != 0 {
-				return fmt.Errorf("proto: wrong wireType = %d for field Pid", wireType)
-			}
-			m.Pid = 0
-			for shift := uint(0); ; shift += 7 {
-				if shift >= 64 {
-					return ErrIntOverflowTasks
-				}
-				if iNdEx >= l {
-					return io.ErrUnexpectedEOF
-				}
-				b := dAtA[iNdEx]
-				iNdEx++
-				m.Pid |= (uint32(b) & 0x7F) << shift
-				if b < 0x80 {
-					break
-				}
-			}
 		default:
 			iNdEx = preIndex
 			skippy, err := skipTasks(dAtA[iNdEx:])
@@ -4896,80 +5029,81 @@ func init() {
 }
 
 var fileDescriptorTasks = []byte{
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+	0xd0, 0x3f, 0xad, 0xe8, 0x9b, 0x47, 0xb8, 0xd5, 0xa8, 0x3b, 0x7a, 0xf4, 0xa9, 0xe1, 0x99, 0x6f,
+	0xc3, 0xa2, 0xda, 0x48, 0x9d, 0x5f, 0x9d, 0x45, 0x3b, 0x3b, 0xcb, 0x16, 0x14, 0xeb, 0xb8, 0x83,
+	0xe7, 0xce, 0x18, 0xf3, 0x57, 0x0d, 0x6e, 0x48, 0x4f, 0xf1, 0x6e, 0x2b, 0x90, 0x8a, 0xc1, 0x7a,
+	0xff, 0xb4, 0x92, 0x6a, 0xd4, 0x9d, 0x14, 0xb9, 0x80, 0x11, 0x54, 0x81, 0x02, 0x3e, 0x22, 0xbc,
+	0xc9, 0xb8, 0xcb, 0x7b, 0x51, 0xce, 0x45, 0x5f, 0x20, 0x5a, 0xda, 0x11, 0x2b, 0xe8, 0x11, 0xe4,
+	0xa3, 0x19, 0xf6, 0x9a, 0x2e, 0x17, 0x29, 0x56, 0xa8, 0x19, 0x23, 0x01, 0x7c, 0x3a, 0x78, 0x0e,
+	0xeb, 0xb9, 0x93, 0xd3, 0xca, 0xb5, 0x97, 0x7f, 0x55, 0x34, 0x27, 0x27, 0x61, 0x8f, 0xb8, 0x49,
+	0x61, 0x59, 0x9e, 0x6f, 0x3b, 0xa4, 0x2d, 0xcc, 0xd8, 0x95, 0xb3, 0x5f, 0x87, 0x1b, 0x5b, 0x98,
+	0xcf, 0xcb, 0xeb, 0x67, 0x70, 0x33, 0xf6, 0xa2, 0x78, 0x5d, 0x83, 0x4c, 0xa4, 0x0a, 0x02, 0x5e,
+	0xa8, 0xdd, 0x4e, 0xbe, 0x81, 0xc3, 0x7b, 0xea, 0x19, 0x08, 0x80, 0x30, 0x33, 0xef, 0xc2, 0xd2,
+	0x97, 0x84, 0x09, 0x17, 0xf1, 0xa5, 0x57, 0x40, 0xdf, 0x23, 0x1d, 0x8e, 0x43, 0x79, 0x06, 0x47,
+	0xcd, 0xcc, 0x3a, 0x14, 0x13, 0xb6, 0x6a, 0x3f, 0x1b, 0xb2, 0x42, 0x82, 0x4b, 0x9a, 0xd0, 0x82,
+	0x09, 0x1b, 0x4a, 0x3b, 0xf3, 0xa5, 0x06, 0x85, 0x2f, 0x48, 0xa7, 0x73, 0xd5, 0x14, 0x0b, 0x1d,
+	0x21, 0xed, 0x48, 0x2d, 0x64, 0xca, 0xa8, 0x59, 0x94, 0x61, 0x6e, 0xa7, 0x23, 0x12, 0x25, 0xe7,
+	0x44, 0x43, 0xf3, 0x1f, 0x0d, 0x50, 0x04, 0x7e, 0x03, 0xc1, 0x8f, 0xa5, 0x2e, 0x75, 0xb1, 0xd4,
+	0xa5, 0xc7, 0x48, 0x5d, 0x66, 0xac, 0xd4, 0x65, 0x87, 0xa4, 0xae, 0x0a, 0x19, 0x16, 0xe0, 0x96,
+	0x10, 0xc7, 0x71, 0x4a, 0x25, 0x2c, 0x92, 0x2c, 0x2d, 0x8c, 0x4d, 0xc4, 0x5b, 0xf0, 0xbf, 0x73,
+	0x57, 0x97, 0x61, 0x35, 0x7f, 0xd6, 0x60, 0xc9, 0xc1, 0x8c, 0x7c, 0x8f, 0xb7, 0xf9, 0xf1, 0x95,
+	0x87, 0x6a, 0x19, 0xb2, 0x2f, 0x88, 0xc7, 0xf7, 0x55, 0xa4, 0xe4, 0x24, 0x62, 0x67, 0x1f, 0x93,
+	0xf6, 0xbe, 0x7c, 0xd4, 0x8b, 0x8e, 0x9a, 0x99, 0x3f, 0xc2, 0x8d, 0x8d, 0x0e, 0x65, 0xb8, 0xf1,
+	0xf8, 0xbf, 0x38, 0x98, 0x0c, 0x67, 0x5a, 0x44, 0x41, 0x4e, 0xcc, 0xcf, 0x61, 0x69, 0xdb, 0xed,
+	0xb1, 0xb9, 0x65, 0x71, 0x0b, 0x8a, 0x0e, 0x66, 0xbd, 0xee, 0xdc, 0x8e, 0x36, 0xe1, 0x66, 0xf4,
+	0x32, 0xb7, 0x89, 0x37, 0x4f, 0xf2, 0x9a, 0xef, 0x4a, 0x31, 0x90, 0x6e, 0xd4, 0xfb, 0x46, 0x90,
+	0x09, 0x88, 0x27, 0x9f, 0xf7, 0xa2, 0x23, 0xc6, 0xe6, 0x9f, 0x1a, 0xdc, 0xda, 0x88, 0xcb, 0xe7,
+	0xbc, 0xed, 0x44, 0x13, 0x8a, 0x81, 0x1b, 0x62, 0x9f, 0x37, 0x13, 0x25, 0x5c, 0x86, 0xa4, 0x16,
+	0x49, 0xf5, 0x1f, 0xa7, 0x95, 0xbb, 0x89, 0xc6, 0x88, 0x06, 0xd8, 0x8f, 0xe1, 0xcc, 0x6e, 0xd3,
+	0x35, 0x8f, 0xb4, 0x31, 0xe3, 0x56, 0x5d, 0xfc, 0x72, 0x96, 0xa4, 0xb3, 0x8d, 0x0b, 0xcb, 0x7b,
+	0x7a, 0x96, 0xf2, 0xfe, 0x2d, 0xac, 0x0c, 0xdf, 0x4e, 0x91, 0xf1, 0x29, 0x14, 0xce, 0x9a, 0xb6,
+	0x81, 0xe4, 0x4d, 0xee, 0x33, 0x92, 0x00, 0xf3, 0x07, 0x28, 0x7e, 0x1d, 0x78, 0x6f, 0xa0, 0x05,
+	0xab, 0x41, 0x3e, 0xc4, 0x8c, 0xf6, 0xc2, 0x16, 0x66, 0x82, 0xab, 0x71, 0x97, 0x3a, 0x33, 0xab,
+	0xfd, 0x52, 0x80, 0xac, 0xd0, 0x6e, 0x74, 0x00, 0xba, 0xec, 0x5f, 0x90, 0x6d, 0x4d, 0xea, 0xa9,
+	0xad, 0x91, 0x7e, 0xd1, 0xf8, 0x70, 0x76, 0x80, 0xe2, 0xec, 0x3b, 0xc8, 0x8a, 0x3e, 0x03, 0xdd,
+	0x9d, 0x0c, 0x4d, 0x76, 0x3d, 0xc6, 0xfb, 0x33, 0xd9, 0xaa, 0x1d, 0xda, 0xa0, 0xcb, 0xe2, 0x3d,
+	0xed, 0x3a, 0x23, 0xcd, 0x8c, 0xf1, 0xc1, 0x2c, 0x80, 0x78, 0xa3, 0xe7, 0xb0, 0x78, 0xae, 0x4b,
+	0x40, 0xb5, 0x59, 0xe0, 0xe7, 0xab, 0xca, 0x25, 0xb7, 0xdc, 0x85, 0xf4, 0x16, 0xe6, 0x68, 0x0a,
+	0xe8, 0x7c, 0x2b, 0x61, 0xac, 0xcd, 0x68, 0x1d, 0xf3, 0x97, 0x89, 0x9e, 0x3d, 0xb2, 0x26, 0xc3,
+	0x86, 0xfb, 0x04, 0xc3, 0x9e, 0xd9, 0x5e, 0x6d, 0xd4, 0x80, 0x4c, 0x54, 0xf9, 0xd1, 0x7b, 0x93,
+	0x81, 0x89, 0xee, 0xc0, 0x58, 0x19, 0xc9, 0xea, 0xcd, 0xe8, 0xcf, 0x3a, 0xb4, 0x0d, 0x99, 0x48,
+	0xaa, 0xd1, 0x94, 0x7c, 0x1c, 0xad, 0xea, 0x63, 0x3d, 0xee, 0x40, 0x3e, 0x2e, 0x78, 0xd3, 0xa8,
+	0x18, 0xae, 0x8c, 0x63, 0x9d, 0x3e, 0x86, 0x05, 0x55, 0xaa, 0xa6, 0x85, 0xf0, 0x7c, 0x45, 0x9b,
+	0xe0, 0x30, 0x2b, 0x4a, 0xcf, 0xb4, 0x13, 0x0e, 0xd7, 0xa7, 0xb1, 0x0e, 0x9f, 0x80, 0x2e, 0x6b,
+	0xd0, 0xb4, 0xc7, 0x33, 0x52, 0xa9, 0xc6, 0xba, 0x24, 0x90, 0x1b, 0x94, 0x11, 0xb4, 0x36, 0x3d,
+	0x47, 0x12, 0x55, 0xcb, 0xb0, 0x66, 0x35, 0x57, 0x19, 0xf5, 0x02, 0x20, 0x21, 0xf4, 0xf7, 0xa7,
+	0x50, 0x7c, 0x51, 0xc9, 0x32, 0x3e, 0xba, 0x1c, 0x48, 0x6d, 0xfc, 0x04, 0x74, 0xa9, 0xe4, 0xd3,
+	0x68, 0x1b, 0xd1, 0xfb, 0x71, 0xb4, 0xad, 0x7f, 0x73, 0xf2, 0xaa, 0x7c, 0xed, 0xf7, 0x57, 0xe5,
+	0x6b, 0x3f, 0xf5, 0xcb, 0xda, 0x49, 0xbf, 0xac, 0xfd, 0xd6, 0x2f, 0x6b, 0x7f, 0xf7, 0xcb, 0xda,
+	0xb3, 0x87, 0xaf, 0xf7, 0xcf, 0x93, 0x07, 0x62, 0xb0, 0xab, 0x8b, 0x7d, 0xee, 0xff, 0x1b, 0x00,
+	0x00, 0xff, 0xff, 0x55, 0x8b, 0x54, 0x53, 0x83, 0x11, 0x00, 0x00,
 }
diff --git a/api/services/tasks/v1/tasks.proto b/api/services/tasks/v1/tasks.proto
index b6a8edb5c..a36267900 100644
--- a/api/services/tasks/v1/tasks.proto
+++ b/api/services/tasks/v1/tasks.proto
@@ -16,8 +16,8 @@ service Tasks {
 	// Create a task.
 	rpc Create(CreateTaskRequest) returns (CreateTaskResponse);
 
-	// Start a task.
-	rpc Start(StartTaskRequest) returns (google.protobuf.Empty);
+	// Start a process.
+	rpc Start(StartRequest) returns (StartResponse);
 
 	// Delete a task and on disk state.
 	rpc Delete(DeleteTaskRequest) returns (DeleteResponse);
@@ -31,7 +31,7 @@ service Tasks {
 	// Kill a task or process.
 	rpc Kill(KillRequest) returns (google.protobuf.Empty);
 
-	rpc Exec(ExecProcessRequest) returns (ExecProcessResponse);
+	rpc Exec(ExecProcessRequest) returns (google.protobuf.Empty);
 
 	rpc ResizePty(ResizePtyRequest) returns (google.protobuf.Empty);
 
@@ -74,8 +74,13 @@ message CreateTaskResponse {
 	uint32 pid = 2;
 }
 
-message StartTaskRequest {
+message StartRequest {
 	string container_id = 1;
+	string exec_id = 2;
+}
+
+message StartResponse {
+	uint32 pid = 1;
 }
 
 message DeleteTaskRequest {
@@ -132,7 +137,6 @@ message ExecProcessRequest {
 }
 
 message ExecProcessResponse {
-	uint32 pid = 1;
 }
 
 message ResizePtyRequest {
diff --git a/container_test.go b/container_test.go
index 2b423285f..a44c1f263 100644
--- a/container_test.go
+++ b/container_test.go
@@ -869,7 +869,7 @@ func TestContainerExecNoBinaryExists(t *testing.T) {
 		close(finished)
 	}()
 
-	// start an exec process without running the original container process info
+	// start an exec process without running the original container process
 	processSpec := spec.Process
 	processSpec.Args = []string{
 		"none",
diff --git a/linux/process.go b/linux/process.go
index 3c22574fc..337bc41bb 100644
--- a/linux/process.go
+++ b/linux/process.go
@@ -79,7 +79,17 @@ func (p *Process) CloseIO(ctx context.Context) error {
 		Stdin: true,
 	})
 	if err != nil {
-		err = errdefs.FromGRPC(err)
+		return errdefs.FromGRPC(err)
 	}
-	return err
+	return nil
+}
+
+func (p *Process) Start(ctx context.Context) error {
+	_, err := p.t.shim.Start(ctx, &shim.StartRequest{
+		ID: p.id,
+	})
+	if err != nil {
+		return errdefs.FromGRPC(err)
+	}
+	return nil
 }
diff --git a/linux/task.go b/linux/task.go
index 51a85079b..b0aadb6e5 100644
--- a/linux/task.go
+++ b/linux/task.go
@@ -118,11 +118,6 @@ func (t *Task) Exec(ctx context.Context, id string, opts runtime.ExecOpts) (runt
 	if _, err := t.shim.Exec(ctx, request); err != nil {
 		return nil, errdefs.FromGRPC(err)
 	}
-	if _, err := t.shim.Start(ctx, &shim.StartRequest{
-		ID: id,
-	}); err != nil {
-		return nil, errdefs.FromGRPC(err)
-	}
 	return &Process{
 		id: id,
 		t:  t,
diff --git a/process.go b/process.go
index 440be26ea..0ca6f23a6 100644
--- a/process.go
+++ b/process.go
@@ -31,27 +31,17 @@ func (p *process) Pid() uint32 {
 
 // Start starts the exec process
 func (p *process) Start(ctx context.Context) error {
-	any, err := typeurl.MarshalAny(p.spec)
-	if err != nil {
-		return err
-	}
-	request := &tasks.ExecProcessRequest{
+	r, err := p.task.client.TaskService().Start(ctx, &tasks.StartRequest{
 		ContainerID: p.task.id,
 		ExecID:      p.id,
-		Terminal:    p.io.Terminal,
-		Stdin:       p.io.Stdin,
-		Stdout:      p.io.Stdout,
-		Stderr:      p.io.Stderr,
-		Spec:        any,
-	}
-	response, err := p.task.client.TaskService().Exec(ctx, request)
+	})
 	if err != nil {
 		p.io.Cancel()
 		p.io.Wait()
 		p.io.Close()
 		return err
 	}
-	p.pid = response.Pid
+	p.pid = r.Pid
 	return nil
 }
 
diff --git a/runtime/task.go b/runtime/task.go
index 8d3c5b5c5..612d54523 100644
--- a/runtime/task.go
+++ b/runtime/task.go
@@ -23,6 +23,8 @@ type Process interface {
 	ResizePty(context.Context, ConsoleSize) error
 	// CloseStdin closes the processes stdin
 	CloseIO(context.Context) error
+	// Start the container's user defined process
+	Start(context.Context) error
 }
 
 type Task interface {
@@ -30,8 +32,6 @@ type Task interface {
 
 	// Information of the container
 	Info() TaskInfo
-	// Start the container's user defined process
-	Start(context.Context) error
 	// Pause pauses the container process
 	Pause(context.Context) error
 	// Resume unpauses the container process
diff --git a/services/tasks/service.go b/services/tasks/service.go
index a6764ccdb..9ceadb5a6 100644
--- a/services/tasks/service.go
+++ b/services/tasks/service.go
@@ -152,16 +152,27 @@ func (s *Service) Create(ctx context.Context, r *api.CreateTaskRequest) (*api.Cr
 	}, nil
 }
 
-func (s *Service) Start(ctx context.Context, r *api.StartTaskRequest) (*google_protobuf.Empty, error) {
+func (s *Service) Start(ctx context.Context, r *api.StartRequest) (*api.StartResponse, error) {
 	t, err := s.getTask(ctx, r.ContainerID)
 	if err != nil {
 		return nil, err
 	}
-	if err := t.Start(ctx); err != nil {
+	p := runtime.Process(t)
+	if r.ExecID != "" {
+		if p, err = t.Process(ctx, r.ExecID); err != nil {
+			return nil, err
+		}
+	}
+	if err := p.Start(ctx); err != nil {
 		return nil, err
 	}
-
-	return empty, nil
+	state, err := p.State(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return &api.StartResponse{
+		Pid: state.Pid,
+	}, nil
 }
 
 func (s *Service) Delete(ctx context.Context, r *api.DeleteTaskRequest) (*api.DeleteResponse, error) {
@@ -317,7 +328,7 @@ func (s *Service) ListPids(ctx context.Context, r *api.ListPidsRequest) (*api.Li
 	}, nil
 }
 
-func (s *Service) Exec(ctx context.Context, r *api.ExecProcessRequest) (*api.ExecProcessResponse, error) {
+func (s *Service) Exec(ctx context.Context, r *api.ExecProcessRequest) (*google_protobuf.Empty, error) {
 	if r.ExecID == "" {
 		return nil, grpc.Errorf(codes.InvalidArgument, "exec id cannot be empty")
 	}
@@ -325,7 +336,7 @@ func (s *Service) Exec(ctx context.Context, r *api.ExecProcessRequest) (*api.Exe
 	if err != nil {
 		return nil, err
 	}
-	process, err := t.Exec(ctx, r.ExecID, runtime.ExecOpts{
+	if _, err := t.Exec(ctx, r.ExecID, runtime.ExecOpts{
 		Spec: r.Spec,
 		IO: runtime.IO{
 			Stdin:    r.Stdin,
@@ -333,17 +344,10 @@ func (s *Service) Exec(ctx context.Context, r *api.ExecProcessRequest) (*api.Exe
 			Stderr:   r.Stderr,
 			Terminal: r.Terminal,
 		},
-	})
-	if err != nil {
+	}); err != nil {
 		return nil, err
 	}
-	state, err := process.State(ctx)
-	if err != nil {
-		return nil, err
-	}
-	return &api.ExecProcessResponse{
-		Pid: state.Pid,
-	}, nil
+	return empty, nil
 }
 
 func (s *Service) ResizePty(ctx context.Context, r *api.ResizePtyRequest) (*google_protobuf.Empty, error) {
diff --git a/task.go b/task.go
index 640506497..4cb47d931 100644
--- a/task.go
+++ b/task.go
@@ -118,7 +118,7 @@ func (t *task) Start(ctx context.Context) error {
 		t.pid = response.Pid
 		return nil
 	}
-	_, err := t.client.TaskService().Start(ctx, &tasks.StartTaskRequest{
+	_, err := t.client.TaskService().Start(ctx, &tasks.StartRequest{
 		ContainerID: t.id,
 	})
 	if err != nil {
@@ -214,6 +214,25 @@ func (t *task) Exec(ctx context.Context, id string, spec *specs.Process, ioCreat
 	if err != nil {
 		return nil, err
 	}
+	any, err := typeurl.MarshalAny(spec)
+	if err != nil {
+		return nil, err
+	}
+	request := &tasks.ExecProcessRequest{
+		ContainerID: t.id,
+		ExecID:      id,
+		Terminal:    i.Terminal,
+		Stdin:       i.Stdin,
+		Stdout:      i.Stdout,
+		Stderr:      i.Stderr,
+		Spec:        any,
+	}
+	if _, err := t.client.TaskService().Exec(ctx, request); err != nil {
+		i.Cancel()
+		i.Wait()
+		i.Close()
+		return nil, err
+	}
 	return &process{
 		id:   id,
 		task: t,