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azure_loadbalancer.go
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azure_loadbalancer.go
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/*
Copyright 2020 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package provider
import (
"context"
"encoding/json"
"errors"
"fmt"
"math"
"net"
"net/netip"
"reflect"
"sort"
"strings"
"unicode"
"github.com/Azure/azure-sdk-for-go/services/network/mgmt/2022-07-01/network"
v1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
cloudprovider "k8s.io/cloud-provider"
servicehelpers "k8s.io/cloud-provider/service/helpers"
"k8s.io/klog/v2"
"k8s.io/utils/pointer"
"k8s.io/utils/ptr"
"k8s.io/utils/strings/slices"
azcache "sigs.k8s.io/cloud-provider-azure/pkg/cache"
"sigs.k8s.io/cloud-provider-azure/pkg/consts"
"sigs.k8s.io/cloud-provider-azure/pkg/metrics"
"sigs.k8s.io/cloud-provider-azure/pkg/provider/loadbalancer"
"sigs.k8s.io/cloud-provider-azure/pkg/provider/loadbalancer/iputil"
"sigs.k8s.io/cloud-provider-azure/pkg/retry"
utilsets "sigs.k8s.io/cloud-provider-azure/pkg/util/sets"
)
var _ cloudprovider.LoadBalancer = (*Cloud)(nil)
// Since public IP is not a part of the load balancer on Azure,
// there is a chance that we could orphan public IP resources while we delete the load balancer (kubernetes/kubernetes#80571).
// We need to make sure the existence of the load balancer depends on the load balancer resource and public IP resource on Azure.
func (az *Cloud) existsPip(clusterName string, service *v1.Service) bool {
v4Enabled, v6Enabled := getIPFamiliesEnabled(service)
existsPipSingleStack := func(isIPv6 bool) bool {
pipName, _, err := az.determinePublicIPName(clusterName, service, isIPv6)
if err != nil {
return false
}
pipResourceGroup := az.getPublicIPAddressResourceGroup(service)
_, existingPip, err := az.getPublicIPAddress(pipResourceGroup, pipName, azcache.CacheReadTypeDefault)
if err != nil {
return false
}
return existingPip
}
if v4Enabled && !existsPipSingleStack(consts.IPVersionIPv4) {
return false
}
if v6Enabled && !existsPipSingleStack(consts.IPVersionIPv6) {
return false
}
return true
}
// GetLoadBalancer returns whether the specified load balancer exists, and
// if so, what its status is.
// Implementations must treat the *v1.Service parameter as read-only and not modify it.
// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager.
// TODO: Break this up into different interfaces (LB, etc) when we have more than one type of service
func (az *Cloud) GetLoadBalancer(_ context.Context, clusterName string, service *v1.Service) (status *v1.LoadBalancerStatus, exists bool, err error) {
existingLBs, err := az.ListLB(service)
if err != nil {
return nil, az.existsPip(clusterName, service), err
}
_, _, status, _, existsLb, err := az.getServiceLoadBalancer(service, clusterName, nil, false, &existingLBs)
if err != nil || existsLb {
return status, existsLb || az.existsPip(clusterName, service), err
}
flippedService := flipServiceInternalAnnotation(service)
_, _, status, _, existsLb, err = az.getServiceLoadBalancer(flippedService, clusterName, nil, false, &existingLBs)
if err != nil || existsLb {
return status, existsLb || az.existsPip(clusterName, service), err
}
// Return exists = false only if the load balancer and the public IP are not found on Azure
if !existsLb && !az.existsPip(clusterName, service) {
serviceName := getServiceName(service)
klog.V(5).Infof("getloadbalancer (cluster:%s) (service:%s) - doesn't exist", clusterName, serviceName)
return nil, false, nil
}
// Return exists = true if only the public IP exists
return nil, true, nil
}
func getPublicIPDomainNameLabel(service *v1.Service) (string, bool) {
if labelName, found := service.Annotations[consts.ServiceAnnotationDNSLabelName]; found {
return labelName, found
}
return "", false
}
// reconcileService reconcile the LoadBalancer service. It returns LoadBalancerStatus on success.
func (az *Cloud) reconcileService(_ context.Context, clusterName string, service *v1.Service, nodes []*v1.Node) (*v1.LoadBalancerStatus, error) {
serviceName := getServiceName(service)
resourceBaseName := az.GetLoadBalancerName(context.TODO(), "", service)
klog.V(2).Infof("reconcileService: Start reconciling Service %q with its resource basename %q", serviceName, resourceBaseName)
lb, err := az.reconcileLoadBalancer(clusterName, service, nodes, true /* wantLb */)
if err != nil {
klog.Errorf("reconcileLoadBalancer(%s) failed: %v", serviceName, err)
return nil, err
}
lbStatus, lbIPsPrimaryPIPs, fipConfigs, err := az.getServiceLoadBalancerStatus(service, lb)
if err != nil {
klog.Errorf("getServiceLoadBalancerStatus(%s) failed: %v", serviceName, err)
if !errors.Is(err, ErrorNotVmssInstance) {
return nil, err
}
}
serviceIPs := lbIPsPrimaryPIPs
klog.V(2).Infof("reconcileService: reconciling security group for service %q with IPs %q, wantLb = true", serviceName, serviceIPs)
if _, err := az.reconcileSecurityGroup(clusterName, service, ptr.Deref(lb.Name, ""), serviceIPs, true /* wantLb */); err != nil {
klog.Errorf("reconcileSecurityGroup(%s) failed: %#v", serviceName, err)
return nil, err
}
for _, fipConfig := range fipConfigs {
if err := az.reconcilePrivateLinkService(clusterName, service, fipConfig, true /* wantPLS */); err != nil {
klog.Errorf("reconcilePrivateLinkService(%s) failed: %#v", serviceName, err)
return nil, err
}
}
updateService := updateServiceLoadBalancerIPs(service, lbIPsPrimaryPIPs)
flippedService := flipServiceInternalAnnotation(updateService)
if _, err := az.reconcileLoadBalancer(clusterName, flippedService, nil, false /* wantLb */); err != nil {
klog.Errorf("reconcileLoadBalancer(%s) failed: %#v", serviceName, err)
return nil, err
}
// lb is not reused here because the ETAG may be changed in above operations, hence reconcilePublicIP() would get lb again from cache.
klog.V(2).Infof("reconcileService: reconciling pip")
if _, err := az.reconcilePublicIPs(clusterName, updateService, pointer.StringDeref(lb.Name, ""), true /* wantLb */); err != nil {
klog.Errorf("reconcilePublicIP(%s) failed: %#v", serviceName, err)
return nil, err
}
lbName := strings.ToLower(pointer.StringDeref(lb.Name, ""))
key := strings.ToLower(serviceName)
if az.useMultipleStandardLoadBalancers() && isLocalService(service) {
az.localServiceNameToServiceInfoMap.Store(key, newServiceInfo(getServiceIPFamily(service), lbName))
// There are chances that the endpointslice changes after EnsureHostsInPool, so
// need to check endpointslice for a second time.
if err := az.checkAndApplyLocalServiceBackendPoolUpdates(*lb, service); err != nil {
klog.Errorf("failed to checkAndApplyLocalServiceBackendPoolUpdates: %v", err)
return nil, err
}
} else {
az.localServiceNameToServiceInfoMap.Delete(key)
}
return lbStatus, nil
}
// EnsureLoadBalancer creates a new load balancer 'name', or updates the existing one. Returns the status of the balancer
// Implementations must treat the *v1.Service and *v1.Node
// parameters as read-only and not modify them.
// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager.
//
// Implementations may return a (possibly wrapped) api.RetryError to enforce
// backing off at a fixed duration. This can be used for cases like when the
// load balancer is not ready yet (e.g., it is still being provisioned) and
// polling at a fixed rate is preferred over backing off exponentially in
// order to minimize latency.
func (az *Cloud) EnsureLoadBalancer(ctx context.Context, clusterName string, service *v1.Service, nodes []*v1.Node) (*v1.LoadBalancerStatus, error) {
// When a client updates the internal load balancer annotation,
// the service may be switched from an internal LB to a public one, or vice versa.
// Here we'll firstly ensure service do not lie in the opposite LB.
// Serialize service reconcile process
az.serviceReconcileLock.Lock()
defer az.serviceReconcileLock.Unlock()
var err error
serviceName := getServiceName(service)
mc := metrics.NewMetricContext("services", "ensure_loadbalancer", az.ResourceGroup, az.getNetworkResourceSubscriptionID(), serviceName)
klog.V(5).InfoS("EnsureLoadBalancer Start", "service", serviceName, "cluster", clusterName, "service_spec", service)
isOperationSucceeded := false
defer func() {
mc.ObserveOperationWithResult(isOperationSucceeded)
klog.V(5).InfoS("EnsureLoadBalancer Finish", "service", serviceName, "cluster", clusterName, "service_spec", service, "error", err)
}()
lbStatus, err := az.reconcileService(ctx, clusterName, service, nodes)
if err != nil {
return nil, err
}
isOperationSucceeded = true
return lbStatus, nil
}
func (az *Cloud) getLatestService(serviceName string, deepcopy bool) (*v1.Service, bool, error) {
parts := strings.Split(serviceName, "/")
ns, n := parts[0], parts[1]
latestService, err := az.serviceLister.Services(ns).Get(n)
switch {
case apierrors.IsNotFound(err):
// service absence in store means the service deletion is caught by watcher
return nil, false, nil
case err != nil:
return nil, false, err
default:
if deepcopy {
return latestService.DeepCopy(), true, nil
}
return latestService, true, nil
}
}
// UpdateLoadBalancer updates hosts under the specified load balancer.
// Implementations must treat the *v1.Service and *v1.Node
// parameters as read-only and not modify them.
// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager
func (az *Cloud) UpdateLoadBalancer(ctx context.Context, clusterName string, service *v1.Service, nodes []*v1.Node) error {
// Serialize service reconcile process
az.serviceReconcileLock.Lock()
defer az.serviceReconcileLock.Unlock()
var err error
serviceName := getServiceName(service)
mc := metrics.NewMetricContext("services", "update_loadbalancer", az.ResourceGroup, az.getNetworkResourceSubscriptionID(), serviceName)
klog.V(5).InfoS("UpdateLoadBalancer Start", "service", serviceName, "cluster", clusterName, "service_spec", service)
isOperationSucceeded := false
defer func() {
mc.ObserveOperationWithResult(isOperationSucceeded)
klog.V(5).InfoS("UpdateLoadBalancer Finish", "service", serviceName, "cluster", clusterName, "service_spec", service, "error", err)
}()
// In case UpdateLoadBalancer gets stale service spec, retrieve the latest from lister
service, serviceExists, err := az.getLatestService(serviceName, true)
if err != nil {
return fmt.Errorf("UpdateLoadBalancer: failed to get latest service %s: %w", service.Name, err)
}
if !serviceExists {
isOperationSucceeded = true
klog.V(2).Infof("UpdateLoadBalancer: skipping service %s because service is going to be deleted", serviceName)
return nil
}
shouldUpdateLB, err := az.shouldUpdateLoadBalancer(clusterName, service, nodes)
if err != nil {
return err
}
if !shouldUpdateLB {
isOperationSucceeded = true
klog.V(2).Infof("UpdateLoadBalancer: skipping service %s because it is either being deleted or does not exist anymore", service.Name)
return nil
}
_, err = az.reconcileService(ctx, clusterName, service, nodes)
if err != nil {
return err
}
isOperationSucceeded = true
return nil
}
// EnsureLoadBalancerDeleted deletes the specified load balancer if it
// exists, returning nil if the load balancer specified either didn't exist or
// was successfully deleted.
// This construction is useful because many cloud providers' load balancers
// have multiple underlying components, meaning a Get could say that the LB
// doesn't exist even if some part of it is still laying around.
// Implementations must treat the *v1.Service parameter as read-only and not modify it.
// Parameter 'clusterName' is the name of the cluster as presented to kube-controller-manager
func (az *Cloud) EnsureLoadBalancerDeleted(_ context.Context, clusterName string, service *v1.Service) error {
// Serialize service reconcile process
az.serviceReconcileLock.Lock()
defer az.serviceReconcileLock.Unlock()
var err error
serviceName := getServiceName(service)
mc := metrics.NewMetricContext("services", "ensure_loadbalancer_deleted", az.ResourceGroup, az.getNetworkResourceSubscriptionID(), serviceName)
klog.V(5).InfoS("EnsureLoadBalancerDeleted Start", "service", serviceName, "cluster", clusterName, "service_spec", service)
isOperationSucceeded := false
defer func() {
mc.ObserveOperationWithResult(isOperationSucceeded)
klog.V(5).InfoS("EnsureLoadBalancerDeleted Finish", "service", serviceName, "cluster", clusterName, "service_spec", service, "error", err)
}()
lb, _, _, lbIPsPrimaryPIPs, _, err := az.getServiceLoadBalancer(service, clusterName, nil, false, &[]network.LoadBalancer{})
if err != nil && !retry.HasStatusForbiddenOrIgnoredError(err) {
return err
}
serviceIPsToCleanup := lbIPsPrimaryPIPs
klog.V(2).Infof("EnsureLoadBalancerDeleted: reconciling security group for service %q with IPs %q, wantLb = false", serviceName, serviceIPsToCleanup)
var lbName string
if lb != nil {
lbName = ptr.Deref(lb.Name, "")
}
_, err = az.reconcileSecurityGroup(clusterName, service, lbName, serviceIPsToCleanup, false /* wantLb */)
if err != nil {
return err
}
_, err = az.reconcileLoadBalancer(clusterName, service, nil, false /* wantLb */)
if err != nil && !retry.HasStatusForbiddenOrIgnoredError(err) {
return err
}
// check flipped service also
flippedService := flipServiceInternalAnnotation(service)
if _, err := az.reconcileLoadBalancer(clusterName, flippedService, nil, false /* wantLb */); err != nil {
return err
}
if _, err = az.reconcilePublicIPs(clusterName, service, "", false /* wantLb */); err != nil {
return err
}
if az.useMultipleStandardLoadBalancers() && isLocalService(service) {
key := strings.ToLower(serviceName)
az.localServiceNameToServiceInfoMap.Delete(key)
}
klog.V(2).Infof("Delete service (%s): FINISH", serviceName)
isOperationSucceeded = true
return nil
}
// GetLoadBalancerName returns the name of the load balancer. Implementations must treat the
// *v1.Service parameter as read-only and not modify it.
func (az *Cloud) GetLoadBalancerName(_ context.Context, _ string, service *v1.Service) string {
return cloudprovider.DefaultLoadBalancerName(service)
}
func (az *Cloud) getLoadBalancerResourceGroup() string {
if az.LoadBalancerResourceGroup != "" {
return az.LoadBalancerResourceGroup
}
return az.ResourceGroup
}
// shouldChangeLoadBalancer determines if the load balancer of the service should be switched to another one
// according to the mode annotation on the service. This could be happened when the LB selection mode of an
// existing service is changed to another VMSS/VMAS.
func (az *Cloud) shouldChangeLoadBalancer(service *v1.Service, currLBName, clusterName, expectedLBName string) bool {
// The load balancer can be changed in two cases:
// 1. Using multiple standard load balancers.
// 2. Migrate from multiple standard load balancers to single standard load balancer.
if az.useStandardLoadBalancer() {
if currLBName != expectedLBName {
klog.V(2).Infof("shouldChangeLoadBalancer(%s, %s, %s): change the LB to another one %s", service.Name, currLBName, clusterName, expectedLBName)
return true
}
return false
}
// basic LB
hasMode, isAuto, vmSetName := az.getServiceLoadBalancerMode(service)
// if no mode is given or the mode is `__auto__`, the current LB should be kept
if !hasMode || isAuto {
return false
}
lbName := trimSuffixIgnoreCase(currLBName, consts.InternalLoadBalancerNameSuffix)
// change the LB from vmSet dedicated to primary if the vmSet becomes the primary one
if strings.EqualFold(lbName, vmSetName) {
if !strings.EqualFold(lbName, clusterName) &&
strings.EqualFold(az.VMSet.GetPrimaryVMSetName(), vmSetName) {
klog.V(2).Infof("shouldChangeLoadBalancer(%s, %s, %s): change the LB to another one", service.Name, currLBName, clusterName)
return true
}
return false
}
if strings.EqualFold(vmSetName, az.VMSet.GetPrimaryVMSetName()) && strings.EqualFold(clusterName, lbName) {
return false
}
// if the VMSS/VMAS of the current LB is different from the mode, change the LB
// to another one
klog.V(2).Infof("shouldChangeLoadBalancer(%s, %s, %s): change the LB to another one", service.Name, currLBName, clusterName)
return true
}
// removeFrontendIPConfigurationFromLoadBalancer removes the given ip configs from the load balancer
// and delete the load balancer if there is no ip config on it. It returns the name of the deleted load balancer
// and it will be used in reconcileLoadBalancer to remove the load balancer from the list.
func (az *Cloud) removeFrontendIPConfigurationFromLoadBalancer(lb *network.LoadBalancer, existingLBs *[]network.LoadBalancer, fips []*network.FrontendIPConfiguration, clusterName string, service *v1.Service) (string, error) {
if lb == nil || lb.LoadBalancerPropertiesFormat == nil || lb.FrontendIPConfigurations == nil {
return "", nil
}
fipConfigs := *lb.FrontendIPConfigurations
for i, fipConfig := range fipConfigs {
for _, fip := range fips {
if strings.EqualFold(pointer.StringDeref(fipConfig.Name, ""), pointer.StringDeref(fip.Name, "")) {
fipConfigs = append(fipConfigs[:i], fipConfigs[i+1:]...)
break
}
}
}
lb.FrontendIPConfigurations = &fipConfigs
// also remove the corresponding rules/probes
if lb.LoadBalancingRules != nil {
lbRules := *lb.LoadBalancingRules
for i := len(lbRules) - 1; i >= 0; i-- {
for _, fip := range fips {
if strings.Contains(pointer.StringDeref(lbRules[i].Name, ""), pointer.StringDeref(fip.Name, "")) {
lbRules = append(lbRules[:i], lbRules[i+1:]...)
}
}
}
lb.LoadBalancingRules = &lbRules
}
if lb.Probes != nil {
lbProbes := *lb.Probes
for i := len(lbProbes) - 1; i >= 0; i-- {
for _, fip := range fips {
if strings.Contains(pointer.StringDeref(lbProbes[i].Name, ""), pointer.StringDeref(fip.Name, "")) {
lbProbes = append(lbProbes[:i], lbProbes[i+1:]...)
}
}
}
lb.Probes = &lbProbes
}
// PLS does not support IPv6 so there will not be additional API calls.
for _, fip := range fips {
// clean up any private link service associated with the frontEndIPConfig
if err := az.reconcilePrivateLinkService(clusterName, service, fip, false /* wantPLS */); err != nil {
klog.Errorf("removeFrontendIPConfigurationFromLoadBalancer(%s, %s, %s, %s): failed to clean up PLS: %v", pointer.StringDeref(lb.Name, ""), pointer.StringDeref(fip.Name, ""), clusterName, service.Name, err)
return "", err
}
}
var deletedLBName string
fipNames := []string{}
for _, fip := range fips {
fipNames = append(fipNames, pointer.StringDeref(fip.Name, ""))
}
logPrefix := fmt.Sprintf("removeFrontendIPConfigurationFromLoadBalancer(%s, %q, %s, %s)", pointer.StringDeref(lb.Name, ""), fipNames, clusterName, service.Name)
if len(fipConfigs) == 0 {
klog.V(2).Infof("%s: deleting load balancer because there is no remaining frontend IP configurations", logPrefix)
err := az.cleanOrphanedLoadBalancer(lb, *existingLBs, service, clusterName)
if err != nil {
klog.Errorf("%s: failed to cleanupOrphanedLoadBalancer: %v", logPrefix, err)
return "", err
}
deletedLBName = pointer.StringDeref(lb.Name, "")
} else {
klog.V(2).Infof("%s: updating the load balancer", logPrefix)
err := az.CreateOrUpdateLB(service, *lb)
if err != nil {
klog.Errorf("%s: failed to CreateOrUpdateLB: %v", logPrefix, err)
return "", err
}
_ = az.lbCache.Delete(pointer.StringDeref(lb.Name, ""))
}
return deletedLBName, nil
}
func (az *Cloud) cleanOrphanedLoadBalancer(lb *network.LoadBalancer, existingLBs []network.LoadBalancer, service *v1.Service, clusterName string) error {
lbName := pointer.StringDeref(lb.Name, "")
serviceName := getServiceName(service)
isBackendPoolPreConfigured := az.isBackendPoolPreConfigured(service)
v4Enabled, v6Enabled := getIPFamiliesEnabled(service)
lbBackendPoolIDs := az.getBackendPoolIDs(clusterName, lbName)
lbBackendPoolIDsToDelete := []string{}
if v4Enabled {
lbBackendPoolIDsToDelete = append(lbBackendPoolIDsToDelete, lbBackendPoolIDs[consts.IPVersionIPv4])
}
if v6Enabled {
lbBackendPoolIDsToDelete = append(lbBackendPoolIDsToDelete, lbBackendPoolIDs[consts.IPVersionIPv6])
}
if isBackendPoolPreConfigured {
klog.V(2).Infof("cleanOrphanedLoadBalancer(%s, %s, %s): ignore cleanup of dirty lb because the lb is pre-configured", lbName, serviceName, clusterName)
} else {
foundLB := false
for _, existingLB := range existingLBs {
if strings.EqualFold(pointer.StringDeref(lb.Name, ""), pointer.StringDeref(existingLB.Name, "")) {
foundLB = true
break
}
}
if !foundLB {
klog.V(2).Infof("cleanOrphanedLoadBalancer: the LB %s doesn't exist, will not delete it", pointer.StringDeref(lb.Name, ""))
return nil
}
// When FrontendIPConfigurations is empty, we need to delete the Azure load balancer resource itself,
// because an Azure load balancer cannot have an empty FrontendIPConfigurations collection
klog.V(2).Infof("cleanOrphanedLoadBalancer(%s, %s, %s): deleting the LB since there are no remaining frontendIPConfigurations", lbName, serviceName, clusterName)
// Remove backend pools from vmSets. This is required for virtual machine scale sets before removing the LB.
vmSetName := az.mapLoadBalancerNameToVMSet(lbName, clusterName)
if _, ok := az.VMSet.(*availabilitySet); ok {
// do nothing for availability set
lb.BackendAddressPools = nil
}
if deleteErr := az.safeDeleteLoadBalancer(*lb, clusterName, vmSetName, service); deleteErr != nil {
klog.Warningf("cleanOrphanedLoadBalancer(%s, %s, %s): failed to DeleteLB: %v", lbName, serviceName, clusterName, deleteErr)
rgName, vmssName, parseErr := retry.GetVMSSMetadataByRawError(deleteErr)
if parseErr != nil {
klog.Warningf("cleanOrphanedLoadBalancer(%s, %s, %s): failed to parse error: %v", lbName, serviceName, clusterName, parseErr)
return deleteErr.Error()
}
if rgName == "" || vmssName == "" {
klog.Warningf("cleanOrphanedLoadBalancer(%s, %s, %s): empty rgName or vmssName", lbName, serviceName, clusterName)
return deleteErr.Error()
}
// if we reach here, it means the VM couldn't be deleted because it is being referenced by a VMSS
if _, ok := az.VMSet.(*ScaleSet); !ok {
klog.Warningf("cleanOrphanedLoadBalancer(%s, %s, %s): unexpected VMSet type, expected VMSS", lbName, serviceName, clusterName)
return deleteErr.Error()
}
if !strings.EqualFold(rgName, az.ResourceGroup) {
return fmt.Errorf("cleanOrphanedLoadBalancer(%s, %s, %s): the VMSS %s is in the resource group %s, but is referencing the LB in %s", lbName, serviceName, clusterName, vmssName, rgName, az.ResourceGroup)
}
vmssNamesMap := map[string]bool{vmssName: true}
if err := az.VMSet.EnsureBackendPoolDeletedFromVMSets(vmssNamesMap, lbBackendPoolIDsToDelete); err != nil {
klog.Errorf("cleanOrphanedLoadBalancer(%s, %s, %s): failed to EnsureBackendPoolDeletedFromVMSets: %v", lbName, serviceName, clusterName, err)
return err
}
if deleteErr := az.DeleteLB(service, lbName); deleteErr != nil {
klog.Errorf("cleanOrphanedLoadBalancer(%s, %s, %s): failed delete lb for the second time, stop retrying: %v", lbName, serviceName, clusterName, deleteErr)
return deleteErr.Error()
}
}
klog.V(10).Infof("cleanOrphanedLoadBalancer(%s, %s, %s): az.DeleteLB finished", lbName, serviceName, clusterName)
}
return nil
}
// safeDeleteLoadBalancer deletes the load balancer after decoupling it from the vmSet
func (az *Cloud) safeDeleteLoadBalancer(lb network.LoadBalancer, clusterName, vmSetName string, service *v1.Service) *retry.Error {
lbBackendPoolIDs := az.getBackendPoolIDs(clusterName, pointer.StringDeref(lb.Name, ""))
lbBackendPoolIDsToDelete := []string{}
v4Enabled, v6Enabled := getIPFamiliesEnabled(service)
if v4Enabled {
lbBackendPoolIDsToDelete = append(lbBackendPoolIDsToDelete, lbBackendPoolIDs[consts.IPVersionIPv4])
}
if v6Enabled {
lbBackendPoolIDsToDelete = append(lbBackendPoolIDsToDelete, lbBackendPoolIDs[consts.IPVersionIPv6])
}
if _, err := az.VMSet.EnsureBackendPoolDeleted(service, lbBackendPoolIDsToDelete, vmSetName, lb.BackendAddressPools, true); err != nil {
return retry.NewError(false, fmt.Errorf("safeDeleteLoadBalancer: failed to EnsureBackendPoolDeleted: %w", err))
}
klog.V(2).Infof("safeDeleteLoadBalancer: deleting LB %s", pointer.StringDeref(lb.Name, ""))
if rerr := az.DeleteLB(service, pointer.StringDeref(lb.Name, "")); rerr != nil {
return rerr
}
_ = az.lbCache.Delete(pointer.StringDeref(lb.Name, ""))
// Remove corresponding nodes in ActiveNodes and nodesWithCorrectLoadBalancerByPrimaryVMSet.
for i := range az.MultipleStandardLoadBalancerConfigurations {
if strings.EqualFold(
trimSuffixIgnoreCase(pointer.StringDeref(lb.Name, ""), consts.InternalLoadBalancerNameSuffix),
az.MultipleStandardLoadBalancerConfigurations[i].Name,
) {
for _, nodeName := range az.MultipleStandardLoadBalancerConfigurations[i].ActiveNodes.UnsortedList() {
az.nodesWithCorrectLoadBalancerByPrimaryVMSet.Delete(nodeName)
}
az.MultipleStandardLoadBalancerConfigurations[i].ActiveNodes = utilsets.NewString()
break
}
}
return nil
}
// getServiceLoadBalancer gets the loadbalancer for the service if it already exists.
// If wantLb is TRUE then -it selects a new load balancer.
// In case the selected load balancer does not exist it returns network.LoadBalancer struct
// with added metadata (such as name, location) and existsLB set to FALSE.
// By default - cluster default LB is returned.
func (az *Cloud) getServiceLoadBalancer(
service *v1.Service,
clusterName string,
nodes []*v1.Node,
wantLb bool,
existingLBs *[]network.LoadBalancer,
) (lb *network.LoadBalancer, refreshedLBs *[]network.LoadBalancer, status *v1.LoadBalancerStatus, lbIPsPrimaryPIPs []string, exists bool, err error) {
isInternal := requiresInternalLoadBalancer(service)
var defaultLB *network.LoadBalancer
primaryVMSetName := az.VMSet.GetPrimaryVMSetName()
defaultLBName, err := az.getAzureLoadBalancerName(service, existingLBs, clusterName, primaryVMSetName, isInternal)
if err != nil {
return nil, nil, nil, nil, false, err
}
// reuse the lb list from reconcileSharedLoadBalancer to reduce the api call
if existingLBs == nil || len(*existingLBs) == 0 {
lbs, err := az.ListLB(service)
if err != nil {
return nil, nil, nil, nil, false, err
}
existingLBs = &lbs
}
// check if the service already has a load balancer
var shouldChangeLB bool
for i := range *existingLBs {
existingLB := (*existingLBs)[i]
if strings.EqualFold(*existingLB.Name, defaultLBName) {
defaultLB = &existingLB
}
if isInternalLoadBalancer(&existingLB) != isInternal {
continue
}
var fipConfigs []*network.FrontendIPConfiguration
status, lbIPsPrimaryPIPs, fipConfigs, err = az.getServiceLoadBalancerStatus(service, &existingLB)
if err != nil {
return nil, nil, nil, nil, false, err
}
if status == nil {
// service is not on this load balancer
continue
}
klog.V(4).Infof("getServiceLoadBalancer(%s, %s, %v): current lb IPs: %q", service.Name, clusterName, wantLb, lbIPsPrimaryPIPs)
// select another load balancer instead of returning
// the current one if the change is needed
var (
deletedLBName string
err error
)
if wantLb && az.shouldChangeLoadBalancer(service, pointer.StringDeref(existingLB.Name, ""), clusterName, defaultLBName) {
shouldChangeLB = true
fipConfigNames := []string{}
for _, fipConfig := range fipConfigs {
fipConfigNames = append(fipConfigNames, pointer.StringDeref(fipConfig.Name, ""))
}
deletedLBName, err = az.removeFrontendIPConfigurationFromLoadBalancer(&existingLB, existingLBs, fipConfigs, clusterName, service)
if err != nil {
klog.Errorf("getServiceLoadBalancer(%s, %s, %v): failed to remove frontend IP configurations %q from load balancer: %v", service.Name, clusterName, wantLb, fipConfigNames, err)
return nil, nil, nil, nil, false, err
}
if deletedLBName != "" {
removeLBFromList(existingLBs, deletedLBName)
}
az.reconcileMultipleStandardLoadBalancerConfigurationStatus(
false,
getServiceName(service),
pointer.StringDeref(existingLB.Name, ""),
)
if isLocalService(service) && az.useMultipleStandardLoadBalancers() {
// No need for the endpoint slice informer to update the backend pool
// for the service because the main loop will delete the old backend pool
// and create a new one in the new load balancer.
svcName := getServiceName(service)
if az.backendPoolUpdater != nil {
az.backendPoolUpdater.removeOperation(svcName)
}
// Remove backend pools on the previous load balancer for the local service
if deletedLBName == "" {
newLBs, err := az.cleanupLocalServiceBackendPool(service, nodes, existingLBs, clusterName)
if err != nil {
klog.Errorf("getServiceLoadBalancer(%s, %s, %v): failed to cleanup backend pool for local service: %s", service.Name, clusterName, wantLb, err.Error())
return nil, nil, nil, nil, false, err
}
existingLBs = newLBs
}
}
break
}
return &existingLB, existingLBs, status, lbIPsPrimaryPIPs, true, nil
}
// Service does not have a load balancer, select one.
// Single standard load balancer doesn't need this because
// all backends nodes should be added to same LB.
if wantLb && !az.useStandardLoadBalancer() {
// select new load balancer for service
selectedLB, exists, err := az.selectLoadBalancer(clusterName, service, existingLBs, nodes)
if err != nil {
return nil, existingLBs, nil, nil, false, err
}
return selectedLB, existingLBs, status, lbIPsPrimaryPIPs, exists, err
}
// If the service moves to a different load balancer, return the one
// instead of creating a new load balancer if it exists.
if shouldChangeLB {
for _, existingLB := range *existingLBs {
if strings.EqualFold(pointer.StringDeref(existingLB.Name, ""), defaultLBName) {
return &existingLB, existingLBs, status, lbIPsPrimaryPIPs, true, nil
}
}
}
// create a default LB with meta data if not present
if defaultLB == nil {
defaultLB = &network.LoadBalancer{
Name: &defaultLBName,
Location: &az.Location,
LoadBalancerPropertiesFormat: &network.LoadBalancerPropertiesFormat{},
}
if az.useStandardLoadBalancer() {
defaultLB.Sku = &network.LoadBalancerSku{
Name: network.LoadBalancerSkuNameStandard,
}
}
if az.HasExtendedLocation() {
defaultLB.ExtendedLocation = &network.ExtendedLocation{
Name: &az.ExtendedLocationName,
Type: getExtendedLocationTypeFromString(az.ExtendedLocationType),
}
}
}
return defaultLB, existingLBs, nil, nil, false, nil
}
// selectLoadBalancer selects load balancer for the service in the cluster.
// The selection algorithm selects the load balancer which currently has
// the minimum lb rules. If there are multiple LBs with same number of rules,
// then selects the first one (sorted based on name).
// Note: this function is only useful for basic LB clusters.
func (az *Cloud) selectLoadBalancer(clusterName string, service *v1.Service, existingLBs *[]network.LoadBalancer, nodes []*v1.Node) (selectedLB *network.LoadBalancer, existsLb bool, err error) {
isInternal := requiresInternalLoadBalancer(service)
serviceName := getServiceName(service)
klog.V(2).Infof("selectLoadBalancer for service (%s): isInternal(%v) - start", serviceName, isInternal)
vmSetNames, err := az.VMSet.GetVMSetNames(service, nodes)
if err != nil {
klog.Errorf("az.selectLoadBalancer: cluster(%s) service(%s) isInternal(%t) - az.GetVMSetNames failed, err=(%v)", clusterName, serviceName, isInternal, err)
return nil, false, err
}
klog.V(2).Infof("selectLoadBalancer: cluster(%s) service(%s) isInternal(%t) - vmSetNames %v", clusterName, serviceName, isInternal, *vmSetNames)
mapExistingLBs := map[string]network.LoadBalancer{}
for _, lb := range *existingLBs {
mapExistingLBs[*lb.Name] = lb
}
selectedLBRuleCount := math.MaxInt32
for _, currVMSetName := range *vmSetNames {
currLBName, _ := az.getAzureLoadBalancerName(service, existingLBs, clusterName, currVMSetName, isInternal)
lb, exists := mapExistingLBs[currLBName]
if !exists {
// select this LB as this is a new LB and will have minimum rules
// create tmp lb struct to hold metadata for the new load-balancer
var loadBalancerSKU network.LoadBalancerSkuName
if az.useStandardLoadBalancer() {
loadBalancerSKU = network.LoadBalancerSkuNameStandard
} else {
loadBalancerSKU = network.LoadBalancerSkuNameBasic
}
selectedLB = &network.LoadBalancer{
Name: &currLBName,
Location: &az.Location,
Sku: &network.LoadBalancerSku{Name: loadBalancerSKU},
LoadBalancerPropertiesFormat: &network.LoadBalancerPropertiesFormat{},
}
if az.HasExtendedLocation() {
selectedLB.ExtendedLocation = &network.ExtendedLocation{
Name: &az.ExtendedLocationName,
Type: getExtendedLocationTypeFromString(az.ExtendedLocationType),
}
}
return selectedLB, false, nil
}
lbRules := *lb.LoadBalancingRules
currLBRuleCount := 0
if lbRules != nil {
currLBRuleCount = len(lbRules)
}
if currLBRuleCount < selectedLBRuleCount {
selectedLBRuleCount = currLBRuleCount
selectedLB = &lb
}
}
if selectedLB == nil {
err = fmt.Errorf("selectLoadBalancer: cluster(%s) service(%s) isInternal(%t) - unable to find load balancer for selected VM sets %v", clusterName, serviceName, isInternal, *vmSetNames)
klog.Error(err)
return nil, false, err
}
// validate if the selected LB has not exceeded the MaximumLoadBalancerRuleCount
if az.Config.MaximumLoadBalancerRuleCount != 0 && selectedLBRuleCount >= az.Config.MaximumLoadBalancerRuleCount {
err = fmt.Errorf("selectLoadBalancer: cluster(%s) service(%s) isInternal(%t) - all available load balancers have exceeded maximum rule limit %d, vmSetNames (%v)", clusterName, serviceName, isInternal, selectedLBRuleCount, *vmSetNames)
klog.Error(err)
return selectedLB, existsLb, err
}
return selectedLB, existsLb, nil
}
// getServiceLoadBalancerStatus returns LB status for the Service.
// Before DualStack support, old logic takes the first ingress IP as non-additional one
// and the second one as additional one. With DualStack support, the second IP may be
// the IP of another IP family so the new logic returns two variables.
func (az *Cloud) getServiceLoadBalancerStatus(service *v1.Service, lb *network.LoadBalancer) (status *v1.LoadBalancerStatus, lbIPsPrimaryPIPs []string, fipConfigs []*network.FrontendIPConfiguration, err error) {
if lb == nil {
klog.V(10).Info("getServiceLoadBalancerStatus: lb is nil")
return nil, nil, nil, nil
}
if lb.FrontendIPConfigurations == nil || len(*lb.FrontendIPConfigurations) == 0 {
klog.V(10).Info("getServiceLoadBalancerStatus: lb.FrontendIPConfigurations is nil")
return nil, nil, nil, nil
}
isInternal := requiresInternalLoadBalancer(service)
serviceName := getServiceName(service)
lbIngresses := []v1.LoadBalancerIngress{}
for i := range *lb.FrontendIPConfigurations {
ipConfiguration := (*lb.FrontendIPConfigurations)[i]
owns, isPrimaryService, _ := az.serviceOwnsFrontendIP(ipConfiguration, service)
if owns {
klog.V(2).Infof("get(%s): lb(%s) - found frontend IP config, primary service: %v", serviceName, pointer.StringDeref(lb.Name, ""), isPrimaryService)
var lbIP *string
if isInternal {
lbIP = ipConfiguration.PrivateIPAddress
} else {
if ipConfiguration.PublicIPAddress == nil {
return nil, nil, nil, fmt.Errorf("get(%s): lb(%s) - failed to get LB PublicIPAddress is Nil", serviceName, *lb.Name)
}
pipID := ipConfiguration.PublicIPAddress.ID
if pipID == nil {
return nil, nil, nil, fmt.Errorf("get(%s): lb(%s) - failed to get LB PublicIPAddress ID is Nil", serviceName, *lb.Name)
}
pipName, err := getLastSegment(*pipID, "/")
if err != nil {
return nil, nil, nil, fmt.Errorf("get(%s): lb(%s) - failed to get LB PublicIPAddress Name from ID(%s)", serviceName, *lb.Name, *pipID)
}
pip, existsPip, err := az.getPublicIPAddress(az.getPublicIPAddressResourceGroup(service), pipName, azcache.CacheReadTypeDefault)
if err != nil {
return nil, nil, nil, err
}
if existsPip {
lbIP = pip.IPAddress
}
}
klog.V(2).Infof("getServiceLoadBalancerStatus gets ingress IP %q from frontendIPConfiguration %q for service %q", pointer.StringDeref(lbIP, ""), pointer.StringDeref(ipConfiguration.Name, ""), serviceName)
lbIngresses = append(lbIngresses, v1.LoadBalancerIngress{IP: pointer.StringDeref(lbIP, "")})
lbIPsPrimaryPIPs = append(lbIPsPrimaryPIPs, pointer.StringDeref(lbIP, ""))
fipConfigs = append(fipConfigs, &ipConfiguration)
}
}
if len(lbIngresses) == 0 {
return nil, nil, nil, nil
}
// set additional public IPs to LoadBalancerStatus, so that kube-proxy would create their iptables rules.
additionalIPs, err := loadbalancer.AdditionalPublicIPs(service)
if err != nil {
return &v1.LoadBalancerStatus{Ingress: lbIngresses}, lbIPsPrimaryPIPs, fipConfigs, err
}
if len(additionalIPs) > 0 {
for _, pip := range additionalIPs {
lbIngresses = append(lbIngresses, v1.LoadBalancerIngress{
IP: pip.String(),
})
}
}
return &v1.LoadBalancerStatus{Ingress: lbIngresses}, lbIPsPrimaryPIPs, fipConfigs, nil
}
func (az *Cloud) determinePublicIPName(clusterName string, service *v1.Service, isIPv6 bool) (string, bool, error) {
if name := getServicePIPName(service, isIPv6); name != "" {
return name, true, nil
}
pipResourceGroup := az.getPublicIPAddressResourceGroup(service)
if id := getServicePIPPrefixID(service, isIPv6); id != "" {
pipName, err := az.getPublicIPName(clusterName, service, isIPv6)
return pipName, false, err
}
loadBalancerIP := getServiceLoadBalancerIP(service, isIPv6)
// Assume that the service without loadBalancerIP set is a primary service.
// If a secondary service doesn't set the loadBalancerIP, it is not allowed to share the IP.
if len(loadBalancerIP) == 0 {
pipName, err := az.getPublicIPName(clusterName, service, isIPv6)
return pipName, false, err
}
// For the services with loadBalancerIP set, an existing public IP is required, primary
// or secondary, or a public IP not found error would be reported.
pip, err := az.findMatchedPIP(loadBalancerIP, "", pipResourceGroup)
if err != nil {
return "", false, err
}
if pip != nil && pip.Name != nil {
return *pip.Name, false, nil
}
return "", false, fmt.Errorf("user supplied IP Address %s was not found in resource group %s", loadBalancerIP, pipResourceGroup)
}
func flipServiceInternalAnnotation(service *v1.Service) *v1.Service {
copyService := service.DeepCopy()
if copyService.Annotations == nil {
copyService.Annotations = map[string]string{}
}
if v, ok := copyService.Annotations[consts.ServiceAnnotationLoadBalancerInternal]; ok && v == consts.TrueAnnotationValue {
// If it is internal now, we make it external by remove the annotation
delete(copyService.Annotations, consts.ServiceAnnotationLoadBalancerInternal)
} else {
// If it is external now, we make it internal
copyService.Annotations[consts.ServiceAnnotationLoadBalancerInternal] = consts.TrueAnnotationValue
}
return copyService
}
func updateServiceLoadBalancerIPs(service *v1.Service, serviceIPs []string) *v1.Service {
copyService := service.DeepCopy()
if copyService != nil {
for _, serviceIP := range serviceIPs {
setServiceLoadBalancerIP(copyService, serviceIP)
}
}
return copyService
}
func (az *Cloud) ensurePublicIPExists(service *v1.Service, pipName string, domainNameLabel, clusterName string, shouldPIPExisted, foundDNSLabelAnnotation, isIPv6 bool) (*network.PublicIPAddress, error) {
pipResourceGroup := az.getPublicIPAddressResourceGroup(service)
pip, existsPip, err := az.getPublicIPAddress(pipResourceGroup, pipName, azcache.CacheReadTypeDefault)
if err != nil {
return nil, err
}
serviceName := getServiceName(service)
ipVersion := network.IPv4
if isIPv6 {
ipVersion = network.IPv6
}
var changed, owns, isUserAssignedPIP bool
if existsPip {
// ensure that the service tag is good for managed pips
owns, isUserAssignedPIP = serviceOwnsPublicIP(service, &pip, clusterName)
if owns && !isUserAssignedPIP {
changed, err = bindServicesToPIP(&pip, []string{serviceName}, false)
if err != nil {
return nil, err
}
}
if pip.Tags == nil {
pip.Tags = make(map[string]*string)
}
// return if pip exist and dns label is the same
if strings.EqualFold(getDomainNameLabel(&pip), domainNameLabel) {
if existingServiceName := getServiceFromPIPDNSTags(pip.Tags); existingServiceName != "" && strings.EqualFold(existingServiceName, serviceName) {
klog.V(6).Infof("ensurePublicIPExists for service(%s): pip(%s) - "+
"the service is using the DNS label on the public IP", serviceName, pipName)
var rerr *retry.Error
if changed {