Import libnetwork fix for rolling updates

This patch allows endpoints to complete servicing connections while
being removed from a service.  The fix is entirely within libnetwork
and requires no changes to the moby codebase proper.  It operates
by initially down-weighting a container endpoint in the load balancer
to 0 while keeping the endpoint present in the load balancer.  This
allows traffic to continue to flow to the endpoint while preventing new
connections from going to the endpoint.  This allows the container
to complete requests during the "stop_grace_period" and then exit when
finished without interruption of service.

This change requires propagating the status of disabled service
endpoints via the networkDB.  Accordingly, the patch includes both code
to generate and handle service update messages.  It also augments the
service structure with a ServiceDisabled boolean to convey whether an
endpoint should ultimately be removed or just disabled.  This,
naturally, required a rebuild of the protocol buffer code.

The protocol buffer encoding is designed to support additions of fields
to messages in a backwards-compatible manner.  Protocol buffer
unmarshalling code automatically skips past any fields that it isn't
aware of.  As a result, an older moby daemon without this fix can
receive and will process correctly networkDB messages from newer moby
daemons with this patch.

As it turns out, the additional field is simply a bool that is otherwise
irrelevent on networkDB create and delete events.  So its absence in
older moby daemon processing has no impact.  However, the fix leverages
the "update" networkDB message which was previously unused in
libnetwork.  Although older libnetwork implementations parse the message
cleanly, they will see the message as unexpected and as such issue a log
at error level indicating the receipt of such.

Other than this there should be no other negative impact for use of this
patch in mixed environments. (Although older mobys won't be able to
gracefully downgrade connections on their nodes of course.)

Signed-off-by: Chris Telfer <ctelfer@docker.com>

vendor.conf

@@ -32,7 +32,7 @@ github.com/tonistiigi/fsutil dea3a0da73aee887fc02142d995be764106ac5e2
 #get libnetwork packages
 
 # When updating, also update LIBNETWORK_COMMIT in hack/dockerfile/install/proxy accordingly
-github.com/docker/libnetwork 1b91bc94094ecfdae41daa465cc0c8df37dfb3dd
+github.com/docker/libnetwork 2bf63300c52f5ea61989f85c732f00097d746530
 github.com/docker/go-events 9461782956ad83b30282bf90e31fa6a70c255ba9
 github.com/armon/go-radix e39d623f12e8e41c7b5529e9a9dd67a1e2261f80
 github.com/armon/go-metrics eb0af217e5e9747e41dd5303755356b62d28e3ec

vendor/github.com/docker/libnetwork/agent.go

@@ -638,14 +638,15 @@ func (ep *endpoint) addServiceInfoToCluster(sb *sandbox) error {
 	}
 
 	buf, err := proto.Marshal(&EndpointRecord{
-		Name:         name,
+		Name:            name,
-		ServiceName:  ep.svcName,
+		ServiceName:     ep.svcName,
-		ServiceID:    ep.svcID,
+		ServiceID:       ep.svcID,
-		VirtualIP:    ep.virtualIP.String(),
+		VirtualIP:       ep.virtualIP.String(),
-		IngressPorts: ingressPorts,
+		IngressPorts:    ingressPorts,
-		Aliases:      ep.svcAliases,
+		Aliases:         ep.svcAliases,
-		TaskAliases:  ep.myAliases,
+		TaskAliases:     ep.myAliases,
-		EndpointIP:   ep.Iface().Address().IP.String(),
+		EndpointIP:      ep.Iface().Address().IP.String(),
+		ServiceDisabled: false,
 	})
 	if err != nil {
 		return err
@@ -663,7 +664,7 @@ func (ep *endpoint) addServiceInfoToCluster(sb *sandbox) error {
 	return nil
 }
 
-func (ep *endpoint) deleteServiceInfoFromCluster(sb *sandbox, method string) error {
+func (ep *endpoint) deleteServiceInfoFromCluster(sb *sandbox, fullRemove bool, method string) error {
 	if ep.isAnonymous() && len(ep.myAliases) == 0 {
 		return nil
 	}
@@ -677,6 +678,15 @@ func (ep *endpoint) deleteServiceInfoFromCluster(sb *sandbox, method string) err
 	defer sb.Service.Unlock()
 	logrus.Debugf("deleteServiceInfoFromCluster from %s START for %s %s", method, ep.svcName, ep.ID())
 
+	// Avoid a race w/ with a container that aborts preemptively.  This would
+	// get caught in disableServceInNetworkDB, but we check here to make the
+	// nature of the condition more clear.
+	// See comment in addServiceInfoToCluster()
+	if e := sb.getEndpoint(ep.ID()); e == nil {
+		logrus.Warnf("deleteServiceInfoFromCluster suppressing service resolution ep is not anymore in the sandbox %s", ep.ID())
+		return nil
+	}
+
 	c := n.getController()
 	agent := c.getAgent()
 
@@ -686,9 +696,13 @@ func (ep *endpoint) deleteServiceInfoFromCluster(sb *sandbox, method string) err
 	}
 
 	if agent != nil {
-		// First delete from networkDB then locally
+		// First update the networkDB then locally
-		if err := agent.networkDB.DeleteEntry(libnetworkEPTable, n.ID(), ep.ID()); err != nil {
+		if fullRemove {
-			logrus.Warnf("deleteServiceInfoFromCluster NetworkDB DeleteEntry failed for %s %s err:%s", ep.id, n.id, err)
+			if err := agent.networkDB.DeleteEntry(libnetworkEPTable, n.ID(), ep.ID()); err != nil {
+				logrus.Warnf("deleteServiceInfoFromCluster NetworkDB DeleteEntry failed for %s %s err:%s", ep.id, n.id, err)
+			}
+		} else {
+			disableServiceInNetworkDB(agent, n, ep)
 		}
 	}
 
@@ -699,7 +713,7 @@ func (ep *endpoint) deleteServiceInfoFromCluster(sb *sandbox, method string) err
 			if n.ingress {
 				ingressPorts = ep.ingressPorts
 			}
-			if err := c.rmServiceBinding(ep.svcName, ep.svcID, n.ID(), ep.ID(), name, ep.virtualIP, ingressPorts, ep.svcAliases, ep.myAliases, ep.Iface().Address().IP, "deleteServiceInfoFromCluster", true); err != nil {
+			if err := c.rmServiceBinding(ep.svcName, ep.svcID, n.ID(), ep.ID(), name, ep.virtualIP, ingressPorts, ep.svcAliases, ep.myAliases, ep.Iface().Address().IP, "deleteServiceInfoFromCluster", true, fullRemove); err != nil {
 				return err
 			}
 		} else {
@@ -715,6 +729,35 @@ func (ep *endpoint) deleteServiceInfoFromCluster(sb *sandbox, method string) err
 	return nil
 }
 
+func disableServiceInNetworkDB(a *agent, n *network, ep *endpoint) {
+	var epRec EndpointRecord
+
+	logrus.Debugf("disableServiceInNetworkDB for %s %s", ep.svcName, ep.ID())
+
+	// Update existing record to indicate that the service is disabled
+	inBuf, err := a.networkDB.GetEntry(libnetworkEPTable, n.ID(), ep.ID())
+	if err != nil {
+		logrus.Warnf("disableServiceInNetworkDB GetEntry failed for %s %s err:%s", ep.id, n.id, err)
+		return
+	}
+	// Should never fail
+	if err := proto.Unmarshal(inBuf, &epRec); err != nil {
+		logrus.Errorf("disableServiceInNetworkDB unmarshal failed for %s %s err:%s", ep.id, n.id, err)
+		return
+	}
+	epRec.ServiceDisabled = true
+	// Should never fail
+	outBuf, err := proto.Marshal(&epRec)
+	if err != nil {
+		logrus.Errorf("disableServiceInNetworkDB marshalling failed for %s %s err:%s", ep.id, n.id, err)
+		return
+	}
+	// Send update to the whole cluster
+	if err := a.networkDB.UpdateEntry(libnetworkEPTable, n.ID(), ep.ID(), outBuf); err != nil {
+		logrus.Warnf("disableServiceInNetworkDB UpdateEntry failed for %s %s err:%s", ep.id, n.id, err)
+	}
+}
+
 func (n *network) addDriverWatches() {
 	if !n.isClusterEligible() {
 		return
@@ -844,7 +887,6 @@ func (c *controller) handleEpTableEvent(ev events.Event) {
 		nid   string
 		eid   string
 		value []byte
-		isAdd bool
 		epRec EndpointRecord
 	)
 
@@ -853,12 +895,15 @@ func (c *controller) handleEpTableEvent(ev events.Event) {
 		nid = event.NetworkID
 		eid = event.Key
 		value = event.Value
-		isAdd = true
 	case networkdb.DeleteEvent:
 		nid = event.NetworkID
 		eid = event.Key
 		value = event.Value
 	case networkdb.UpdateEvent:
+		nid = event.NetworkID
+		eid = event.Key
+		value = event.Value
+	default:
 		logrus.Errorf("Unexpected update service table event = %#v", event)
 		return
 	}
@@ -883,7 +928,8 @@ func (c *controller) handleEpTableEvent(ev events.Event) {
 		return
 	}
 
-	if isAdd {
+	switch ev.(type) {
+	case networkdb.CreateEvent:
 		logrus.Debugf("handleEpTableEvent ADD %s R:%v", eid, epRec)
 		if svcID != "" {
 			// This is a remote task part of a service
@@ -897,11 +943,12 @@ func (c *controller) handleEpTableEvent(ev events.Event) {
 				logrus.Errorf("failed adding container name resolution for %s epRec:%v err:%v", eid, epRec, err)
 			}
 		}
-	} else {
+
+	case networkdb.DeleteEvent:
 		logrus.Debugf("handleEpTableEvent DEL %s R:%v", eid, epRec)
 		if svcID != "" {
 			// This is a remote task part of a service
-			if err := c.rmServiceBinding(svcName, svcID, nid, eid, containerName, vip, ingressPorts, serviceAliases, taskAliases, ip, "handleEpTableEvent", true); err != nil {
+			if err := c.rmServiceBinding(svcName, svcID, nid, eid, containerName, vip, ingressPorts, serviceAliases, taskAliases, ip, "handleEpTableEvent", true, true); err != nil {
 				logrus.Errorf("failed removing service binding for %s epRec:%v err:%v", eid, epRec, err)
 				return
 			}
@@ -911,5 +958,18 @@ func (c *controller) handleEpTableEvent(ev events.Event) {
 				logrus.Errorf("failed removing container name resolution for %s epRec:%v err:%v", eid, epRec, err)
 			}
 		}
+	case networkdb.UpdateEvent:
+		logrus.Debugf("handleEpTableEvent UPD %s R:%v", eid, epRec)
+		// We currently should only get these to inform us that an endpoint
+		// is disabled.  Report if otherwise.
+		if svcID == "" || !epRec.ServiceDisabled {
+			logrus.Errorf("Unexpected update table event for %s epRec:%v", eid, epRec)
+			return
+		}
+		// This is a remote task that is part of a service that is now disabled
+		if err := c.rmServiceBinding(svcName, svcID, nid, eid, containerName, vip, ingressPorts, serviceAliases, taskAliases, ip, "handleEpTableEvent", true, false); err != nil {
+			logrus.Errorf("failed disabling service binding for %s epRec:%v err:%v", eid, epRec, err)
+			return
+		}
 	}
 }

vendor/github.com/docker/libnetwork/agent.pb.go

@@ -77,6 +77,8 @@ type EndpointRecord struct {
 	Aliases []string `protobuf:"bytes,7,rep,name=aliases" json:"aliases,omitempty"`
 	// List of aliases task specific aliases
 	TaskAliases []string `protobuf:"bytes,8,rep,name=task_aliases,json=taskAliases" json:"task_aliases,omitempty"`
+	// Whether this enpoint's service has been disabled
+	ServiceDisabled bool `protobuf:"varint,9,opt,name=service_disabled,json=serviceDisabled,proto3" json:"service_disabled,omitempty"`
 }
 
 func (m *EndpointRecord) Reset()                    { *m = EndpointRecord{} }
@@ -139,6 +141,13 @@ func (m *EndpointRecord) GetTaskAliases() []string {
 	return nil
 }
 
+func (m *EndpointRecord) GetServiceDisabled() bool {
+	if m != nil {
+		return m.ServiceDisabled
+	}
+	return false
+}
+
 // PortConfig specifies an exposed port which can be
 // addressed using the given name. This can be later queried
 // using a service discovery api or a DNS SRV query. The node
@@ -202,7 +211,7 @@ func (this *EndpointRecord) GoString() string {
 	if this == nil {
 		return "nil"
 	}
-	s := make([]string, 0, 12)
+	s := make([]string, 0, 13)
 	s = append(s, "&libnetwork.EndpointRecord{")
 	s = append(s, "Name: "+fmt.Sprintf("%#v", this.Name)+",\n")
 	s = append(s, "ServiceName: "+fmt.Sprintf("%#v", this.ServiceName)+",\n")
@@ -214,6 +223,7 @@ func (this *EndpointRecord) GoString() string {
 	}
 	s = append(s, "Aliases: "+fmt.Sprintf("%#v", this.Aliases)+",\n")
 	s = append(s, "TaskAliases: "+fmt.Sprintf("%#v", this.TaskAliases)+",\n")
+	s = append(s, "ServiceDisabled: "+fmt.Sprintf("%#v", this.ServiceDisabled)+",\n")
 	s = append(s, "}")
 	return strings.Join(s, "")
 }
@@ -325,6 +335,16 @@ func (m *EndpointRecord) MarshalTo(dAtA []byte) (int, error) {
 			i += copy(dAtA[i:], s)
 		}
 	}
+	if m.ServiceDisabled {
+		dAtA[i] = 0x48
+		i++
+		if m.ServiceDisabled {
+			dAtA[i] = 1
+		} else {
+			dAtA[i] = 0
+		}
+		i++
+	}
 	return i, nil
 }
 
@@ -367,24 +387,6 @@ func (m *PortConfig) MarshalTo(dAtA []byte) (int, error) {
 	return i, nil
 }
 
-func encodeFixed64Agent(dAtA []byte, offset int, v uint64) int {
-	dAtA[offset] = uint8(v)
-	dAtA[offset+1] = uint8(v >> 8)
-	dAtA[offset+2] = uint8(v >> 16)
-	dAtA[offset+3] = uint8(v >> 24)
-	dAtA[offset+4] = uint8(v >> 32)
-	dAtA[offset+5] = uint8(v >> 40)
-	dAtA[offset+6] = uint8(v >> 48)
-	dAtA[offset+7] = uint8(v >> 56)
-	return offset + 8
-}
-func encodeFixed32Agent(dAtA []byte, offset int, v uint32) int {
-	dAtA[offset] = uint8(v)
-	dAtA[offset+1] = uint8(v >> 8)
-	dAtA[offset+2] = uint8(v >> 16)
-	dAtA[offset+3] = uint8(v >> 24)
-	return offset + 4
-}
 func encodeVarintAgent(dAtA []byte, offset int, v uint64) int {
 	for v >= 1<<7 {
 		dAtA[offset] = uint8(v&0x7f | 0x80)
@@ -435,6 +437,9 @@ func (m *EndpointRecord) Size() (n int) {
 			n += 1 + l + sovAgent(uint64(l))
 		}
 	}
+	if m.ServiceDisabled {
+		n += 2
+	}
 	return n
 }
 
@@ -483,6 +488,7 @@ func (this *EndpointRecord) String() string {
 		`IngressPorts:` + strings.Replace(fmt.Sprintf("%v", this.IngressPorts), "PortConfig", "PortConfig", 1) + `,`,
 		`Aliases:` + fmt.Sprintf("%v", this.Aliases) + `,`,
 		`TaskAliases:` + fmt.Sprintf("%v", this.TaskAliases) + `,`,
+		`ServiceDisabled:` + fmt.Sprintf("%v", this.ServiceDisabled) + `,`,
 		`}`,
 	}, "")
 	return s
@@ -771,6 +777,26 @@ func (m *EndpointRecord) Unmarshal(dAtA []byte) error {
 			}
 			m.TaskAliases = append(m.TaskAliases, string(dAtA[iNdEx:postIndex]))
 			iNdEx = postIndex
+		case 9:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ServiceDisabled", wireType)
+			}
+			var v int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowAgent
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				v |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			m.ServiceDisabled = bool(v != 0)
 		default:
 			iNdEx = preIndex
 			skippy, err := skipAgent(dAtA[iNdEx:])
@@ -1036,33 +1062,34 @@ var (
 func init() { proto.RegisterFile("agent.proto", fileDescriptorAgent) }
 
 var fileDescriptorAgent = []byte{
-	// 437 bytes of a gzipped FileDescriptorProto
+	// 459 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x6c, 0x90, 0xc1, 0x6e, 0xd3, 0x30,
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+	0x50, 0x50, 0x91, 0x6f, 0x2b, 0x52, 0x84, 0x5e, 0xe2, 0xcc, 0x87, 0xf8, 0xc8, 0xf0, 0x95, 0xc1,
-	0x4b, 0xdc, 0x69, 0xe4, 0xfe, 0x01, 0x9a, 0x81, 0xaf, 0x32, 0x51, 0x50, 0x65, 0x16, 0x33, 0x3d,
+	0xb3, 0x2f, 0x7d, 0x80, 0xfd, 0x10, 0x8f, 0xf6, 0x7e, 0x0a, 0x43, 0xbd, 0xa7, 0x1d, 0xab, 0x74,
-	0x8f, 0x09, 0xb4, 0x48, 0xbf, 0x44, 0x2f, 0x61, 0x52, 0x5f, 0x6e, 0x4b, 0x26, 0x3f, 0xd1, 0xbc,
+	0xe7, 0x93, 0x93, 0xe9, 0xe3, 0x4f, 0x58, 0x64, 0x46, 0xc3, 0x0f, 0x17, 0xd0, 0x14, 0x7c, 0x99,
-	0x75, 0x5c, 0xe3, 0x8c, 0xef, 0xa9, 0xd6, 0xe6, 0x1f, 0x60, 0x68, 0x7f, 0x47, 0x01, 0x0c, 0x36,
+	0xf3, 0x92, 0x48, 0xdd, 0x81, 0x5e, 0xc9, 0x18, 0x43, 0x87, 0xd4, 0x4d, 0xf4, 0x0c, 0x26, 0xcd,
-	0x2b, 0x3c, 0xed, 0x85, 0x4f, 0xaf, 0x6f, 0x62, 0xdf, 0xe2, 0xcd, 0x0a, 0xeb, 0xe4, 0x7c, 0x8d,
+	0xd5, 0xb6, 0xa2, 0xe2, 0x03, 0x29, 0x3a, 0xc7, 0xd5, 0xce, 0xf8, 0x81, 0x2a, 0x6d, 0xf6, 0x0e,
-	0xa7, 0xce, 0xc3, 0xe4, 0x7c, 0x8d, 0x51, 0x08, 0xee, 0xd9, 0x6a, 0x83, 0xa7, 0xfd, 0x70, 0x7a,
+	0x86, 0xf6, 0xef, 0x28, 0x84, 0xc1, 0x7a, 0x99, 0x05, 0xbd, 0xe8, 0xe8, 0xe6, 0x36, 0xf1, 0x2d,
-	0x7d, 0x13, 0x8f, 0x6c, 0xa4, 0x59, 0xe8, 0x7e, 0xff, 0x11, 0xf5, 0x4e, 0x83, 0x3f, 0x77, 0x51,
+	0x5e, 0x2f, 0x33, 0x95, 0x5c, 0xac, 0xb2, 0xc0, 0xf9, 0x37, 0xb9, 0x58, 0x65, 0x28, 0x02, 0xf7,
-	0xef, 0xdf, 0x5d, 0xe4, 0x7c, 0x6d, 0x22, 0xe7, 0x67, 0x13, 0x39, 0xbf, 0x9b, 0xc8, 0xf9, 0xdb,
+	0x7c, 0xb9, 0xce, 0x82, 0x7e, 0x14, 0xdc, 0xdc, 0x26, 0x23, 0x1b, 0x29, 0x16, 0xb9, 0x5f, 0xbf,
-	0x44, 0xce, 0xf6, 0xc0, 0x6c, 0xf3, 0xfa, 0x7f, 0x00, 0x00, 0x00, 0xff, 0xff, 0xce, 0x12, 0x15,
+	0xc5, 0xbd, 0xb3, 0xf0, 0xe7, 0x7d, 0xdc, 0xfb, 0x7d, 0x1f, 0x3b, 0x9f, 0xdb, 0xd8, 0xf9, 0xde,
-	0x67, 0xac, 0x02, 0x00, 0x00,
+	0xc6, 0xce, 0x8f, 0x36, 0x76, 0x7e, 0xb5, 0xb1, 0xb3, 0x3d, 0xd0, 0xaf, 0x79, 0xf9, 0x37, 0x00,
+	0x00, 0xff, 0xff, 0x55, 0x29, 0x75, 0x5c, 0xd7, 0x02, 0x00, 0x00,
 }

vendor/github.com/docker/libnetwork/agent.proto

@@ -37,6 +37,9 @@ message EndpointRecord {
 
 	// List of aliases task specific aliases
 	repeated string task_aliases = 8;
+
+	// Whether this enpoint's service has been disabled
+	bool service_disabled = 9;
 }
 
 // PortConfig specifies an exposed port which can be

vendor/github.com/docker/libnetwork/endpoint.go

@@ -620,7 +620,7 @@ func (ep *endpoint) rename(name string) error {
 	}
 
 	if c.isAgent() {
-		if err = ep.deleteServiceInfoFromCluster(sb, "rename"); err != nil {
+		if err = ep.deleteServiceInfoFromCluster(sb, true, "rename"); err != nil {
 			return types.InternalErrorf("Could not delete service state for endpoint %s from cluster on rename: %v", ep.Name(), err)
 		}
 	} else {
@@ -644,7 +644,7 @@ func (ep *endpoint) rename(name string) error {
 		}
 		defer func() {
 			if err != nil {
-				ep.deleteServiceInfoFromCluster(sb, "rename")
+				ep.deleteServiceInfoFromCluster(sb, true, "rename")
 				ep.name = oldName
 				ep.anonymous = oldAnonymous
 				ep.addServiceInfoToCluster(sb)
@@ -755,8 +755,14 @@ func (ep *endpoint) sbLeave(sb *sandbox, force bool, options ...EndpointOption)
 		}
 	}
 
+	if ep.svcID != "" {
+		if err := ep.deleteServiceInfoFromCluster(sb, true, "sbLeave"); err != nil {
+			logrus.Warnf("Failed to clean up service info on container %s disconnect: %v", ep.name, err)
+		}
+	}
+
 	if err := sb.clearNetworkResources(ep); err != nil {
-		logrus.Warnf("Could not cleanup network resources on container %s disconnect: %v", ep.name, err)
+		logrus.Warnf("Failed to clean up network resources on container %s disconnect: %v", ep.name, err)
 	}
 
 	// Update the store about the sandbox detach only after we
@@ -769,7 +775,7 @@ func (ep *endpoint) sbLeave(sb *sandbox, force bool, options ...EndpointOption)
 	}
 
 	if e := ep.deleteDriverInfoFromCluster(); e != nil {
-		logrus.Errorf("Could not delete endpoint state for endpoint %s from cluster: %v", ep.Name(), e)
+		logrus.Errorf("Failed to delete endpoint state for endpoint %s from cluster: %v", ep.Name(), e)
 	}
 
 	sb.deleteHostsEntries(n.getSvcRecords(ep))

vendor/github.com/docker/libnetwork/sandbox.go

@@ -703,7 +703,7 @@ func (sb *sandbox) DisableService() (err error) {
 	}()
 	for _, ep := range sb.getConnectedEndpoints() {
 		if ep.isServiceEnabled() {
-			if err := ep.deleteServiceInfoFromCluster(sb, "DisableService"); err != nil {
+			if err := ep.deleteServiceInfoFromCluster(sb, false, "DisableService"); err != nil {
 				failedEps = append(failedEps, ep.Name())
 				logrus.Warnf("failed update state for endpoint %s into cluster: %v", ep.Name(), err)
 			}

vendor/github.com/docker/libnetwork/service.go

@@ -79,13 +79,18 @@ func (s *service) printIPToEndpoint(ip string) (string, bool) {
 	return s.ipToEndpoint.String(ip)
 }
 
+type lbBackend struct {
+	ip       net.IP
+	disabled bool
+}
+
 type loadBalancer struct {
 	vip    net.IP
 	fwMark uint32
 
 	// Map of backend IPs backing this loadbalancer on this
 	// network. It is keyed with endpoint ID.
-	backEnds map[string]net.IP
+	backEnds map[string]*lbBackend
 
 	// Back pointer to service to which the loadbalancer belongs.
 	service *service

vendor/github.com/docker/libnetwork/service_common.go

@@ -198,23 +198,8 @@ func (c *controller) cleanupServiceBindings(cleanupNID string) {
 			if cleanupNID != "" && nid != cleanupNID {
 				continue
 			}
-
+			for eid, be := range lb.backEnds {
-			for eid, ip := range lb.backEnds {
+				cleanupFuncs = append(cleanupFuncs, makeServiceCleanupFunc(c, s, nid, eid, lb.vip, be.ip))
-				epID := eid
-				epIP := ip
-				service := s
-				loadBalancer := lb
-				networkID := nid
-				cleanupFuncs = append(cleanupFuncs, func() {
-					// ContainerName and taskAliases are not available here, this is still fine because the Service discovery
-					// cleanup already happened before. The only thing that rmServiceBinding is still doing here a part from the Load
-					// Balancer bookeeping, is to keep consistent the mapping of endpoint to IP.
-					if err := c.rmServiceBinding(service.name, service.id, networkID, epID, "", loadBalancer.vip,
-						service.ingressPorts, service.aliases, []string{}, epIP, "cleanupServiceBindings", false); err != nil {
-						logrus.Errorf("Failed to remove service bindings for service %s network %s endpoint %s while cleanup: %v",
-							service.id, networkID, epID, err)
-					}
-				})
 			}
 		}
 		s.Unlock()
@@ -226,6 +211,17 @@ func (c *controller) cleanupServiceBindings(cleanupNID string) {
 
 }
 
+func makeServiceCleanupFunc(c *controller, s *service, nID, eID string, vip net.IP, ip net.IP) func() {
+	// ContainerName and taskAliases are not available here, this is still fine because the Service discovery
+	// cleanup already happened before. The only thing that rmServiceBinding is still doing here a part from the Load
+	// Balancer bookeeping, is to keep consistent the mapping of endpoint to IP.
+	return func() {
+		if err := c.rmServiceBinding(s.name, s.id, nID, eID, "", vip, s.ingressPorts, s.aliases, []string{}, ip, "cleanupServiceBindings", false, true); err != nil {
+			logrus.Errorf("Failed to remove service bindings for service %s network %s endpoint %s while cleanup: %v", s.id, nID, eID, err)
+		}
+	}
+}
+
 func (c *controller) addServiceBinding(svcName, svcID, nID, eID, containerName string, vip net.IP, ingressPorts []*PortConfig, serviceAliases, taskAliases []string, ip net.IP, method string) error {
 	var addService bool
 
@@ -271,7 +267,7 @@ func (c *controller) addServiceBinding(svcName, svcID, nID, eID, containerName s
 		lb = &loadBalancer{
 			vip:      vip,
 			fwMark:   fwMarkCtr,
-			backEnds: make(map[string]net.IP),
+			backEnds: make(map[string]*lbBackend),
 			service:  s,
 		}
 
@@ -282,7 +278,7 @@ func (c *controller) addServiceBinding(svcName, svcID, nID, eID, containerName s
 		addService = true
 	}
 
-	lb.backEnds[eID] = ip
+	lb.backEnds[eID] = &lbBackend{ip, false}
 
 	ok, entries := s.assignIPToEndpoint(ip.String(), eID)
 	if !ok || entries > 1 {
@@ -307,7 +303,7 @@ func (c *controller) addServiceBinding(svcName, svcID, nID, eID, containerName s
 	return nil
 }
 
-func (c *controller) rmServiceBinding(svcName, svcID, nID, eID, containerName string, vip net.IP, ingressPorts []*PortConfig, serviceAliases []string, taskAliases []string, ip net.IP, method string, deleteSvcRecords bool) error {
+func (c *controller) rmServiceBinding(svcName, svcID, nID, eID, containerName string, vip net.IP, ingressPorts []*PortConfig, serviceAliases []string, taskAliases []string, ip net.IP, method string, deleteSvcRecords bool, fullRemove bool) error {
 
 	var rmService bool
 
@@ -338,13 +334,19 @@ func (c *controller) rmServiceBinding(svcName, svcID, nID, eID, containerName st
 		return nil
 	}
 
-	_, ok = lb.backEnds[eID]
+	be, ok := lb.backEnds[eID]
 	if !ok {
-		logrus.Warnf("rmServiceBinding %s %s %s aborted lb.backEnds[eid] !ok", method, svcName, eID)
+		logrus.Warnf("rmServiceBinding %s %s %s aborted lb.backEnds[eid] && lb.disabled[eid] !ok", method, svcName, eID)
 		return nil
 	}
 
-	delete(lb.backEnds, eID)
+	if fullRemove {
+		// delete regardless
+		delete(lb.backEnds, eID)
+	} else {
+		be.disabled = true
+	}
+
 	if len(lb.backEnds) == 0 {
 		// All the backends for this service have been
 		// removed. Time to remove the load balancer and also
@@ -367,7 +369,7 @@ func (c *controller) rmServiceBinding(svcName, svcID, nID, eID, containerName st
 	// Remove loadbalancer service(if needed) and backend in all
 	// sandboxes in the network only if the vip is valid.
 	if len(vip) != 0 && entries == 0 {
-		n.(*network).rmLBBackend(ip, vip, lb, ingressPorts, rmService)
+		n.(*network).rmLBBackend(ip, vip, lb, ingressPorts, rmService, fullRemove)
 	}
 
 	// Delete the name resolutions

vendor/github.com/docker/libnetwork/service_linux.go

@@ -103,8 +103,10 @@ func (sb *sandbox) populateLoadbalancers(ep *endpoint) {
 		}
 
 		lb.service.Lock()
-		for _, ip := range lb.backEnds {
+		for _, be := range lb.backEnds {
-			sb.addLBBackend(ip, lb.vip, lb.fwMark, lb.service.ingressPorts, eIP, gwIP, n.ingress)
+			if !be.disabled {
+				sb.addLBBackend(be.ip, lb.vip, lb.fwMark, lb.service.ingressPorts, eIP, gwIP, n.ingress)
+			}
 		}
 		lb.service.Unlock()
 	}
@@ -135,7 +137,7 @@ func (n *network) addLBBackend(ip, vip net.IP, lb *loadBalancer, ingressPorts []
 // Remove loadbalancer backend from all sandboxes which has a
 // connection to this network. If needed remove the service entry as
 // well, as specified by the rmService bool.
-func (n *network) rmLBBackend(ip, vip net.IP, lb *loadBalancer, ingressPorts []*PortConfig, rmService bool) {
+func (n *network) rmLBBackend(ip, vip net.IP, lb *loadBalancer, ingressPorts []*PortConfig, rmService bool, fullRemove bool) {
 	n.WalkEndpoints(func(e Endpoint) bool {
 		ep := e.(*endpoint)
 		if sb, ok := ep.getSandbox(); ok {
@@ -148,7 +150,7 @@ func (n *network) rmLBBackend(ip, vip net.IP, lb *loadBalancer, ingressPorts []*
 				gwIP = ep.Iface().Address().IP
 			}
 
-			sb.rmLBBackend(ip, vip, lb.fwMark, ingressPorts, ep.Iface().Address(), gwIP, rmService, n.ingress)
+			sb.rmLBBackend(ip, vip, lb.fwMark, ingressPorts, ep.Iface().Address(), gwIP, rmService, fullRemove, n.ingress)
 		}
 
 		return false
@@ -215,7 +217,7 @@ func (sb *sandbox) addLBBackend(ip, vip net.IP, fwMark uint32, ingressPorts []*P
 }
 
 // Remove loadbalancer backend from one connected sandbox.
-func (sb *sandbox) rmLBBackend(ip, vip net.IP, fwMark uint32, ingressPorts []*PortConfig, eIP *net.IPNet, gwIP net.IP, rmService bool, isIngressNetwork bool) {
+func (sb *sandbox) rmLBBackend(ip, vip net.IP, fwMark uint32, ingressPorts []*PortConfig, eIP *net.IPNet, gwIP net.IP, rmService bool, fullRemove bool, isIngressNetwork bool) {
 	if sb.osSbox == nil {
 		return
 	}
@@ -242,8 +244,15 @@ func (sb *sandbox) rmLBBackend(ip, vip net.IP, fwMark uint32, ingressPorts []*Po
 		Weight:        1,
 	}
 
-	if err := i.DelDestination(s, d); err != nil && err != syscall.ENOENT {
+	if fullRemove {
-		logrus.Errorf("Failed to delete real server %s for vip %s fwmark %d in sbox %s (%s): %v", ip, vip, fwMark, sb.ID()[0:7], sb.ContainerID()[0:7], err)
+		if err := i.DelDestination(s, d); err != nil && err != syscall.ENOENT {
+			logrus.Errorf("Failed to delete real server %s for vip %s fwmark %d in sbox %s (%s): %v", ip, vip, fwMark, sb.ID()[0:7], sb.ContainerID()[0:7], err)
+		}
+	} else {
+		d.Weight = 0
+		if err := i.UpdateDestination(s, d); err != nil && err != syscall.ENOENT {
+			logrus.Errorf("Failed to set LB weight of real server %s to 0 for vip %s fwmark %d in sbox %s (%s): %v", ip, vip, fwMark, sb.ID()[0:7], sb.ContainerID()[0:7], err)
+		}
 	}
 
 	if rmService {

vendor/github.com/docker/libnetwork/service_windows.go

@@ -44,7 +44,10 @@ func (n *network) addLBBackend(ip, vip net.IP, lb *loadBalancer, ingressPorts []
 
 		var endpoints []hcsshim.HNSEndpoint
 
-		for eid := range lb.backEnds {
+		for eid, be := range lb.backEnds {
+			if be.disabled {
+				continue
+			}
 			//Call HNS to get back ID (GUID) corresponding to the endpoint.
 			hnsEndpoint, err := hcsshim.GetHNSEndpointByName(eid)
 			if err != nil {
@@ -114,9 +117,9 @@ func (n *network) addLBBackend(ip, vip net.IP, lb *loadBalancer, ingressPorts []
 	}
 }
 
-func (n *network) rmLBBackend(ip, vip net.IP, lb *loadBalancer, ingressPorts []*PortConfig, rmService bool) {
+func (n *network) rmLBBackend(ip, vip net.IP, lb *loadBalancer, ingressPorts []*PortConfig, rmService bool, fullRemove bool) {
 	if system.GetOSVersion().Build > 16236 {
-		if len(lb.backEnds) > 0 {
+		if numEnabledBackends(lb) > 0 {
 			//Reprogram HNS (actually VFP) with the existing backends.
 			n.addLBBackend(ip, vip, lb, ingressPorts)
 		} else {
@@ -143,6 +146,16 @@ func (n *network) rmLBBackend(ip, vip net.IP, lb *loadBalancer, ingressPorts []*
 	}
 }
 
+func numEnabledBackends(lb *loadBalancer) int {
+	nEnabled := 0
+	for _, be := range lb.backEnds {
+		if !be.disabled {
+			nEnabled++
+		}
+	}
+	return nEnabled
+}
+
 func (sb *sandbox) populateLoadbalancers(ep *endpoint) {
 }