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azure_loadbalancer.go
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azure_loadbalancer.go
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/*
Copyright 2016 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 azure
import (
"fmt"
"strconv"
"strings"
"k8s.io/api/core/v1"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
serviceapi "k8s.io/kubernetes/pkg/api/v1/service"
"github.com/Azure/azure-sdk-for-go/arm/compute"
"github.com/Azure/azure-sdk-for-go/arm/network"
"github.com/Azure/go-autorest/autorest/to"
"github.com/golang/glog"
"k8s.io/apimachinery/pkg/types"
)
// ServiceAnnotationLoadBalancerInternal is the annotation used on the service
const ServiceAnnotationLoadBalancerInternal = "service.beta.kubernetes.io/azure-load-balancer-internal"
// GetLoadBalancer returns whether the specified load balancer exists, and
// if so, what its status is.
func (az *Cloud) GetLoadBalancer(clusterName string, service *v1.Service) (status *v1.LoadBalancerStatus, exists bool, err error) {
isInternal := requiresInternalLoadBalancer(service)
lbName := getLoadBalancerName(clusterName, isInternal)
serviceName := getServiceName(service)
lb, existsLb, err := az.getAzureLoadBalancer(lbName)
if err != nil {
return nil, false, err
}
if !existsLb {
glog.V(5).Infof("get(%s): lb(%s) - doesn't exist", serviceName, lbName)
return nil, false, nil
}
var lbIP *string
if isInternal {
lbFrontendIPConfigName := getFrontendIPConfigName(service)
for _, ipConfiguration := range *lb.FrontendIPConfigurations {
if lbFrontendIPConfigName == *ipConfiguration.Name {
lbIP = ipConfiguration.PrivateIPAddress
break
}
}
} else {
// TODO: Consider also read address from lb's FrontendIPConfigurations
pipName, err := az.determinePublicIPName(clusterName, service)
if err != nil {
return nil, false, err
}
pip, existsPip, err := az.getPublicIPAddress(pipName)
if err != nil {
return nil, false, err
}
if existsPip {
lbIP = pip.IPAddress
}
}
if lbIP == nil {
glog.V(5).Infof("get(%s): lb(%s) - IP doesn't exist", serviceName, lbName)
return nil, false, nil
}
return &v1.LoadBalancerStatus{
Ingress: []v1.LoadBalancerIngress{{IP: *lbIP}},
}, true, nil
}
func (az *Cloud) determinePublicIPName(clusterName string, service *v1.Service) (string, error) {
loadBalancerIP := service.Spec.LoadBalancerIP
if len(loadBalancerIP) == 0 {
return getPublicIPName(clusterName, service), nil
}
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("PublicIPAddressesClient.List(%v): start", az.ResourceGroup)
list, err := az.PublicIPAddressesClient.List(az.ResourceGroup)
glog.V(10).Infof("PublicIPAddressesClient.List(%v): end", az.ResourceGroup)
if err != nil {
return "", err
}
if list.Value != nil {
for ix := range *list.Value {
ip := &(*list.Value)[ix]
if ip.PublicIPAddressPropertiesFormat.IPAddress != nil &&
*ip.PublicIPAddressPropertiesFormat.IPAddress == loadBalancerIP {
return *ip.Name, nil
}
}
}
// TODO: follow next link here? Will there really ever be that many public IPs?
return "", fmt.Errorf("user supplied IP Address %s was not found", loadBalancerIP)
}
// EnsureLoadBalancer creates a new load balancer 'name', or updates the existing one. Returns the status of the balancer
func (az *Cloud) EnsureLoadBalancer(clusterName string, service *v1.Service, nodes []*v1.Node) (*v1.LoadBalancerStatus, error) {
isInternal := requiresInternalLoadBalancer(service)
lbName := getLoadBalancerName(clusterName, isInternal)
// When a client updates the internal load balancer annotation,
// the service may be switched from an internal LB to a public one, or vise versa.
// Here we'll firstly ensure service do not lie in the opposite LB.
err := az.cleanupLoadBalancer(clusterName, service, !isInternal)
if err != nil {
return nil, err
}
serviceName := getServiceName(service)
glog.V(5).Infof("ensure(%s): START clusterName=%q lbName=%q", serviceName, clusterName, lbName)
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("SecurityGroupsClient.Get(%q): start", az.SecurityGroupName)
sg, err := az.SecurityGroupsClient.Get(az.ResourceGroup, az.SecurityGroupName, "")
glog.V(10).Infof("SecurityGroupsClient.Get(%q): end", az.SecurityGroupName)
if err != nil {
return nil, err
}
sg, sgNeedsUpdate, err := az.reconcileSecurityGroup(sg, clusterName, service, true /* wantLb */)
if err != nil {
return nil, err
}
if sgNeedsUpdate {
glog.V(3).Infof("ensure(%s): sg(%s) - updating", serviceName, *sg.Name)
// azure-sdk-for-go introduced contraint validation which breaks the updating here if we don't set these
// to nil. This is a workaround until https://github.com/Azure/go-autorest/issues/112 is fixed
sg.SecurityGroupPropertiesFormat.NetworkInterfaces = nil
sg.SecurityGroupPropertiesFormat.Subnets = nil
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("SecurityGroupsClient.CreateOrUpdate(%q): start", *sg.Name)
respChan, errChan := az.SecurityGroupsClient.CreateOrUpdate(az.ResourceGroup, *sg.Name, sg, nil)
resp := <-respChan
err := <-errChan
glog.V(10).Infof("SecurityGroupsClient.CreateOrUpdate(%q): end", *sg.Name)
if az.CloudProviderBackoff && shouldRetryAPIRequest(resp.Response, err) {
glog.V(2).Infof("ensure(%s) backing off: sg(%s) - updating", serviceName, *sg.Name)
retryErr := az.CreateOrUpdateSGWithRetry(sg)
if retryErr != nil {
glog.V(2).Infof("ensure(%s) abort backoff: sg(%s) - updating", serviceName, *sg.Name)
return nil, retryErr
}
}
if err != nil {
return nil, err
}
}
lb, existsLb, err := az.getAzureLoadBalancer(lbName)
if err != nil {
return nil, err
}
if !existsLb {
lb = network.LoadBalancer{
Name: &lbName,
Location: &az.Location,
LoadBalancerPropertiesFormat: &network.LoadBalancerPropertiesFormat{},
}
}
var lbIP *string
var fipConfigurationProperties *network.FrontendIPConfigurationPropertiesFormat
if isInternal {
subnet, existsSubnet, err := az.getSubnet(az.VnetName, az.SubnetName)
if err != nil {
return nil, err
}
if !existsSubnet {
return nil, fmt.Errorf("ensure(%s): lb(%s) - failed to get subnet: %s/%s", serviceName, lbName, az.VnetName, az.SubnetName)
}
configProperties := network.FrontendIPConfigurationPropertiesFormat{
Subnet: &network.Subnet{
ID: subnet.ID,
},
}
loadBalancerIP := service.Spec.LoadBalancerIP
if loadBalancerIP != "" {
configProperties.PrivateIPAllocationMethod = network.Static
configProperties.PrivateIPAddress = &loadBalancerIP
lbIP = &loadBalancerIP
} else {
// We'll need to call GetLoadBalancer later to retrieve allocated IP.
configProperties.PrivateIPAllocationMethod = network.Dynamic
}
fipConfigurationProperties = &configProperties
} else {
pipName, err := az.determinePublicIPName(clusterName, service)
if err != nil {
return nil, err
}
pip, err := az.ensurePublicIPExists(serviceName, pipName)
if err != nil {
return nil, err
}
lbIP = pip.IPAddress
fipConfigurationProperties = &network.FrontendIPConfigurationPropertiesFormat{
PublicIPAddress: &network.PublicIPAddress{ID: pip.ID},
}
}
lb, lbNeedsUpdate, err := az.reconcileLoadBalancer(lb, fipConfigurationProperties, clusterName, service, nodes)
if err != nil {
return nil, err
}
if !existsLb || lbNeedsUpdate {
glog.V(3).Infof("ensure(%s): lb(%s) - updating", serviceName, lbName)
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("LoadBalancerClient.CreateOrUpdate(%q): start", *lb.Name)
respChan, errChan := az.LoadBalancerClient.CreateOrUpdate(az.ResourceGroup, *lb.Name, lb, nil)
resp := <-respChan
err := <-errChan
glog.V(10).Infof("LoadBalancerClient.CreateOrUpdate(%q): end", *lb.Name)
if az.CloudProviderBackoff && shouldRetryAPIRequest(resp.Response, err) {
glog.V(2).Infof("ensure(%s) backing off: lb(%s) - updating", serviceName, lbName)
retryErr := az.CreateOrUpdateLBWithRetry(lb)
if retryErr != nil {
glog.V(2).Infof("ensure(%s) abort backoff: lb(%s) - updating", serviceName, lbName)
return nil, retryErr
}
}
if err != nil {
return nil, err
}
}
// Add the machines to the backend pool if they're not already
lbBackendName := getBackendPoolName(clusterName)
lbBackendPoolID := az.getBackendPoolID(lbName, lbBackendName)
hostUpdates := make([]func() error, len(nodes))
for i, node := range nodes {
localNodeName := node.Name
f := func() error {
err := az.ensureHostInPool(serviceName, types.NodeName(localNodeName), lbBackendPoolID)
if err != nil {
return fmt.Errorf("ensure(%s): lb(%s) - failed to ensure host in pool: %q", serviceName, lbName, err)
}
return nil
}
hostUpdates[i] = f
}
errs := utilerrors.AggregateGoroutines(hostUpdates...)
if errs != nil {
return nil, utilerrors.Flatten(errs)
}
glog.V(2).Infof("ensure(%s): lb(%s) finished", serviceName, lbName)
if lbIP == nil {
lbStatus, exists, err := az.GetLoadBalancer(clusterName, service)
if err != nil {
return nil, err
}
if !exists {
return nil, fmt.Errorf("ensure(%s): lb(%s) - failed to get back load balancer", serviceName, lbName)
}
return lbStatus, nil
}
return &v1.LoadBalancerStatus{
Ingress: []v1.LoadBalancerIngress{{IP: *lbIP}},
}, nil
}
// UpdateLoadBalancer updates hosts under the specified load balancer.
func (az *Cloud) UpdateLoadBalancer(clusterName string, service *v1.Service, nodes []*v1.Node) error {
_, err := az.EnsureLoadBalancer(clusterName, service, nodes)
return err
}
// 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.
func (az *Cloud) EnsureLoadBalancerDeleted(clusterName string, service *v1.Service) error {
isInternal := requiresInternalLoadBalancer(service)
lbName := getLoadBalancerName(clusterName, isInternal)
serviceName := getServiceName(service)
glog.V(5).Infof("delete(%s): START clusterName=%q lbName=%q", serviceName, clusterName, lbName)
err := az.cleanupLoadBalancer(clusterName, service, isInternal)
if err != nil {
return err
}
sg, existsSg, err := az.getSecurityGroup()
if err != nil {
return err
}
if existsSg {
reconciledSg, sgNeedsUpdate, reconcileErr := az.reconcileSecurityGroup(sg, clusterName, service, false /* wantLb */)
if reconcileErr != nil {
return reconcileErr
}
if sgNeedsUpdate {
glog.V(3).Infof("delete(%s): sg(%s) - updating", serviceName, az.SecurityGroupName)
// azure-sdk-for-go introduced contraint validation which breaks the updating here if we don't set these
// to nil. This is a workaround until https://github.com/Azure/go-autorest/issues/112 is fixed
sg.SecurityGroupPropertiesFormat.NetworkInterfaces = nil
sg.SecurityGroupPropertiesFormat.Subnets = nil
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("SecurityGroupsClient.CreateOrUpdate(%q): start", *reconciledSg.Name)
respChan, errChan := az.SecurityGroupsClient.CreateOrUpdate(az.ResourceGroup, *reconciledSg.Name, reconciledSg, nil)
resp := <-respChan
err := <-errChan
glog.V(10).Infof("SecurityGroupsClient.CreateOrUpdate(%q): end", *reconciledSg.Name)
if az.CloudProviderBackoff && shouldRetryAPIRequest(resp.Response, err) {
glog.V(2).Infof("delete(%s) backing off: sg(%s) - updating", serviceName, az.SecurityGroupName)
retryErr := az.CreateOrUpdateSGWithRetry(reconciledSg)
if retryErr != nil {
err = retryErr
glog.V(2).Infof("delete(%s) abort backoff: sg(%s) - updating", serviceName, az.SecurityGroupName)
}
}
if err != nil {
return err
}
}
}
glog.V(2).Infof("delete(%s): FINISH", serviceName)
return nil
}
func (az *Cloud) cleanupLoadBalancer(clusterName string, service *v1.Service, isInternalLb bool) error {
lbName := getLoadBalancerName(clusterName, isInternalLb)
serviceName := getServiceName(service)
glog.V(10).Infof("ensure lb deleted: clusterName=%q, serviceName=%s, lbName=%q", clusterName, serviceName, lbName)
lb, existsLb, err := az.getAzureLoadBalancer(lbName)
if err != nil {
return err
}
if existsLb {
var publicIPToCleanup *string
if !isInternalLb {
// Find public ip resource to clean up from IP configuration
lbFrontendIPConfigName := getFrontendIPConfigName(service)
for _, config := range *lb.FrontendIPConfigurations {
if strings.EqualFold(*config.Name, lbFrontendIPConfigName) {
if config.PublicIPAddress != nil {
// Only ID property is available
publicIPToCleanup = config.PublicIPAddress.ID
}
break
}
}
}
lb, lbNeedsUpdate, reconcileErr := az.reconcileLoadBalancer(lb, nil, clusterName, service, []*v1.Node{})
if reconcileErr != nil {
return reconcileErr
}
if lbNeedsUpdate {
if len(*lb.FrontendIPConfigurations) > 0 {
glog.V(3).Infof("delete(%s): lb(%s) - updating", serviceName, lbName)
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("LoadBalancerClient.CreateOrUpdate(%q): start", *lb.Name)
respChan, errChan := az.LoadBalancerClient.CreateOrUpdate(az.ResourceGroup, *lb.Name, lb, nil)
resp := <-respChan
err := <-errChan
glog.V(10).Infof("LoadBalancerClient.CreateOrUpdate(%q): end", *lb.Name)
if az.CloudProviderBackoff && shouldRetryAPIRequest(resp.Response, err) {
glog.V(2).Infof("delete(%s) backing off: sg(%s) - updating", serviceName, az.SecurityGroupName)
retryErr := az.CreateOrUpdateLBWithRetry(lb)
if retryErr != nil {
err = retryErr
glog.V(2).Infof("delete(%s) abort backoff: sg(%s) - updating", serviceName, az.SecurityGroupName)
}
}
if err != nil {
return err
}
} else {
glog.V(3).Infof("delete(%s): lb(%s) - deleting; no remaining frontendipconfigs", serviceName, lbName)
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("LoadBalancerClient.Delete(%q): start", lbName)
respChan, errChan := az.LoadBalancerClient.Delete(az.ResourceGroup, lbName, nil)
resp := <-respChan
err := <-errChan
glog.V(10).Infof("LoadBalancerClient.Delete(%q): end", lbName)
if az.CloudProviderBackoff && shouldRetryAPIRequest(resp, err) {
glog.V(2).Infof("delete(%s) backing off: lb(%s) - deleting; no remaining frontendipconfigs", serviceName, lbName)
retryErr := az.DeleteLBWithRetry(lbName)
if retryErr != nil {
err = retryErr
glog.V(2).Infof("delete(%s) abort backoff: lb(%s) - deleting; no remaining frontendipconfigs", serviceName, lbName)
}
}
if err != nil {
return err
}
}
}
// Public IP can be deleted after frontend ip configuration rule deleted.
if publicIPToCleanup != nil {
// Only delete an IP address if we created it, deducing by name.
if index := strings.LastIndex(*publicIPToCleanup, "/"); index != -1 {
managedPipName := getPublicIPName(clusterName, service)
pipName := (*publicIPToCleanup)[index+1:]
if strings.EqualFold(managedPipName, pipName) {
glog.V(5).Infof("Deleting public IP resource %q.", pipName)
err = az.ensurePublicIPDeleted(serviceName, pipName)
if err != nil {
return err
}
} else {
glog.V(5).Infof("Public IP resource %q found, but it does not match managed name %q, skip deleting.", pipName, managedPipName)
}
}
}
}
return nil
}
func (az *Cloud) ensurePublicIPExists(serviceName, pipName string) (*network.PublicIPAddress, error) {
pip, existsPip, err := az.getPublicIPAddress(pipName)
if err != nil {
return nil, err
}
if existsPip {
return &pip, nil
}
pip.Name = to.StringPtr(pipName)
pip.Location = to.StringPtr(az.Location)
pip.PublicIPAddressPropertiesFormat = &network.PublicIPAddressPropertiesFormat{
PublicIPAllocationMethod: network.Static,
}
pip.Tags = &map[string]*string{"service": &serviceName}
glog.V(3).Infof("ensure(%s): pip(%s) - creating", serviceName, *pip.Name)
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("PublicIPAddressesClient.CreateOrUpdate(%q): start", *pip.Name)
respChan, errChan := az.PublicIPAddressesClient.CreateOrUpdate(az.ResourceGroup, *pip.Name, pip, nil)
resp := <-respChan
err = <-errChan
glog.V(10).Infof("PublicIPAddressesClient.CreateOrUpdate(%q): end", *pip.Name)
if az.CloudProviderBackoff && shouldRetryAPIRequest(resp.Response, err) {
glog.V(2).Infof("ensure(%s) backing off: pip(%s) - creating", serviceName, *pip.Name)
retryErr := az.CreateOrUpdatePIPWithRetry(pip)
if retryErr != nil {
glog.V(2).Infof("ensure(%s) abort backoff: pip(%s) - creating", serviceName, *pip.Name)
err = retryErr
}
}
if err != nil {
return nil, err
}
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("PublicIPAddressesClient.Get(%q): start", *pip.Name)
pip, err = az.PublicIPAddressesClient.Get(az.ResourceGroup, *pip.Name, "")
glog.V(10).Infof("PublicIPAddressesClient.Get(%q): end", *pip.Name)
if err != nil {
return nil, err
}
return &pip, nil
}
func (az *Cloud) ensurePublicIPDeleted(serviceName, pipName string) error {
glog.V(2).Infof("ensure(%s): pip(%s) - deleting", serviceName, pipName)
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("PublicIPAddressesClient.Delete(%q): start", pipName)
resp, deleteErrChan := az.PublicIPAddressesClient.Delete(az.ResourceGroup, pipName, nil)
deleteErr := <-deleteErrChan
glog.V(10).Infof("PublicIPAddressesClient.Delete(%q): end", pipName) // response not read yet...
if az.CloudProviderBackoff && shouldRetryAPIRequest(<-resp, deleteErr) {
glog.V(2).Infof("ensure(%s) backing off: pip(%s) - deleting", serviceName, pipName)
retryErr := az.DeletePublicIPWithRetry(pipName)
if retryErr != nil {
glog.V(2).Infof("ensure(%s) abort backoff: pip(%s) - deleting", serviceName, pipName)
return retryErr
}
}
_, realErr := checkResourceExistsFromError(deleteErr)
if realErr != nil {
return nil
}
return nil
}
// This ensures load balancer exists and the frontend ip config is setup.
// This also reconciles the Service's Ports with the LoadBalancer config.
// This entails adding rules/probes for expected Ports and removing stale rules/ports.
func (az *Cloud) reconcileLoadBalancer(lb network.LoadBalancer, fipConfigurationProperties *network.FrontendIPConfigurationPropertiesFormat, clusterName string, service *v1.Service, nodes []*v1.Node) (network.LoadBalancer, bool, error) {
isInternal := requiresInternalLoadBalancer(service)
lbName := getLoadBalancerName(clusterName, isInternal)
serviceName := getServiceName(service)
lbFrontendIPConfigName := getFrontendIPConfigName(service)
lbFrontendIPConfigID := az.getFrontendIPConfigID(lbName, lbFrontendIPConfigName)
lbBackendPoolName := getBackendPoolName(clusterName)
lbBackendPoolID := az.getBackendPoolID(lbName, lbBackendPoolName)
wantLb := fipConfigurationProperties != nil
dirtyLb := false
// Ensure LoadBalancer's Backend Pool Configuration
if wantLb {
newBackendPools := []network.BackendAddressPool{}
if lb.BackendAddressPools != nil {
newBackendPools = *lb.BackendAddressPools
}
foundBackendPool := false
for _, bp := range newBackendPools {
if strings.EqualFold(*bp.Name, lbBackendPoolName) {
glog.V(10).Infof("reconcile(%s)(%t): lb backendpool - found wanted backendpool. not adding anything", serviceName, wantLb)
foundBackendPool = true
break
} else {
glog.V(10).Infof("reconcile(%s)(%t): lb backendpool - found other backendpool %s", serviceName, wantLb, *bp.Name)
}
}
if !foundBackendPool {
newBackendPools = append(newBackendPools, network.BackendAddressPool{
Name: to.StringPtr(lbBackendPoolName),
})
glog.V(10).Infof("reconcile(%s)(%t): lb backendpool - adding backendpool", serviceName, wantLb)
dirtyLb = true
lb.BackendAddressPools = &newBackendPools
}
}
// Ensure LoadBalancer's Frontend IP Configurations
dirtyConfigs := false
newConfigs := []network.FrontendIPConfiguration{}
if lb.FrontendIPConfigurations != nil {
newConfigs = *lb.FrontendIPConfigurations
}
if !wantLb {
for i := len(newConfigs) - 1; i >= 0; i-- {
config := newConfigs[i]
if strings.EqualFold(*config.Name, lbFrontendIPConfigName) {
glog.V(3).Infof("reconcile(%s)(%t): lb frontendconfig(%s) - dropping", serviceName, wantLb, lbFrontendIPConfigName)
newConfigs = append(newConfigs[:i], newConfigs[i+1:]...)
dirtyConfigs = true
}
}
} else {
foundConfig := false
for _, config := range newConfigs {
if strings.EqualFold(*config.Name, lbFrontendIPConfigName) {
foundConfig = true
break
}
}
if !foundConfig {
newConfigs = append(newConfigs,
network.FrontendIPConfiguration{
Name: to.StringPtr(lbFrontendIPConfigName),
FrontendIPConfigurationPropertiesFormat: fipConfigurationProperties,
})
glog.V(10).Infof("reconcile(%s)(%t): lb frontendconfig(%s) - adding", serviceName, wantLb, lbFrontendIPConfigName)
dirtyConfigs = true
}
}
if dirtyConfigs {
dirtyLb = true
lb.FrontendIPConfigurations = &newConfigs
}
// update probes/rules
var ports []v1.ServicePort
if wantLb {
ports = service.Spec.Ports
} else {
ports = []v1.ServicePort{}
}
var expectedProbes []network.Probe
var expectedRules []network.LoadBalancingRule
for _, port := range ports {
lbRuleName := getLoadBalancerRuleName(service, port)
transportProto, _, probeProto, err := getProtocolsFromKubernetesProtocol(port.Protocol)
if err != nil {
return lb, false, err
}
if serviceapi.NeedsHealthCheck(service) {
if port.Protocol == v1.ProtocolUDP {
// ERROR: this isn't supported
// health check (aka source ip preservation) is not
// compatible with UDP (it uses an HTTP check)
return lb, false, fmt.Errorf("services requiring health checks are incompatible with UDP ports")
}
podPresencePath, podPresencePort := serviceapi.GetServiceHealthCheckPathPort(service)
expectedProbes = append(expectedProbes, network.Probe{
Name: &lbRuleName,
ProbePropertiesFormat: &network.ProbePropertiesFormat{
RequestPath: to.StringPtr(podPresencePath),
Protocol: network.ProbeProtocolHTTP,
Port: to.Int32Ptr(podPresencePort),
IntervalInSeconds: to.Int32Ptr(5),
NumberOfProbes: to.Int32Ptr(2),
},
})
} else if port.Protocol != v1.ProtocolUDP {
// we only add the expected probe if we're doing TCP
expectedProbes = append(expectedProbes, network.Probe{
Name: &lbRuleName,
ProbePropertiesFormat: &network.ProbePropertiesFormat{
Protocol: *probeProto,
Port: to.Int32Ptr(port.NodePort),
IntervalInSeconds: to.Int32Ptr(5),
NumberOfProbes: to.Int32Ptr(2),
},
})
}
loadDistribution := network.Default
if service.Spec.SessionAffinity == v1.ServiceAffinityClientIP {
loadDistribution = network.SourceIP
}
expectedRule := network.LoadBalancingRule{
Name: &lbRuleName,
LoadBalancingRulePropertiesFormat: &network.LoadBalancingRulePropertiesFormat{
Protocol: *transportProto,
FrontendIPConfiguration: &network.SubResource{
ID: to.StringPtr(lbFrontendIPConfigID),
},
BackendAddressPool: &network.SubResource{
ID: to.StringPtr(lbBackendPoolID),
},
LoadDistribution: loadDistribution,
FrontendPort: to.Int32Ptr(port.Port),
BackendPort: to.Int32Ptr(port.Port),
EnableFloatingIP: to.BoolPtr(true),
},
}
// we didn't construct the probe objects for UDP because they're not used/needed/allowed
if port.Protocol != v1.ProtocolUDP {
expectedRule.Probe = &network.SubResource{
ID: to.StringPtr(az.getLoadBalancerProbeID(lbName, lbRuleName)),
}
}
expectedRules = append(expectedRules, expectedRule)
}
// remove unwanted probes
dirtyProbes := false
var updatedProbes []network.Probe
if lb.Probes != nil {
updatedProbes = *lb.Probes
}
for i := len(updatedProbes) - 1; i >= 0; i-- {
existingProbe := updatedProbes[i]
if serviceOwnsRule(service, *existingProbe.Name) {
glog.V(10).Infof("reconcile(%s)(%t): lb probe(%s) - considering evicting", serviceName, wantLb, *existingProbe.Name)
keepProbe := false
if findProbe(expectedProbes, existingProbe) {
glog.V(10).Infof("reconcile(%s)(%t): lb probe(%s) - keeping", serviceName, wantLb, *existingProbe.Name)
keepProbe = true
}
if !keepProbe {
updatedProbes = append(updatedProbes[:i], updatedProbes[i+1:]...)
glog.V(10).Infof("reconcile(%s)(%t): lb probe(%s) - dropping", serviceName, wantLb, *existingProbe.Name)
dirtyProbes = true
}
}
}
// add missing, wanted probes
for _, expectedProbe := range expectedProbes {
foundProbe := false
if findProbe(updatedProbes, expectedProbe) {
glog.V(10).Infof("reconcile(%s)(%t): lb probe(%s) - already exists", serviceName, wantLb, *expectedProbe.Name)
foundProbe = true
}
if !foundProbe {
glog.V(10).Infof("reconcile(%s)(%t): lb probe(%s) - adding", serviceName, wantLb, *expectedProbe.Name)
updatedProbes = append(updatedProbes, expectedProbe)
dirtyProbes = true
}
}
if dirtyProbes {
dirtyLb = true
lb.Probes = &updatedProbes
}
// update rules
dirtyRules := false
var updatedRules []network.LoadBalancingRule
if lb.LoadBalancingRules != nil {
updatedRules = *lb.LoadBalancingRules
}
// update rules: remove unwanted
for i := len(updatedRules) - 1; i >= 0; i-- {
existingRule := updatedRules[i]
if serviceOwnsRule(service, *existingRule.Name) {
keepRule := false
glog.V(10).Infof("reconcile(%s)(%t): lb rule(%s) - considering evicting", serviceName, wantLb, *existingRule.Name)
if findRule(expectedRules, existingRule) {
glog.V(10).Infof("reconcile(%s)(%t): lb rule(%s) - keeping", serviceName, wantLb, *existingRule.Name)
keepRule = true
}
if !keepRule {
glog.V(3).Infof("reconcile(%s)(%t): lb rule(%s) - dropping", serviceName, wantLb, *existingRule.Name)
updatedRules = append(updatedRules[:i], updatedRules[i+1:]...)
dirtyRules = true
}
}
}
// update rules: add needed
for _, expectedRule := range expectedRules {
foundRule := false
if findRule(updatedRules, expectedRule) {
glog.V(10).Infof("reconcile(%s)(%t): lb rule(%s) - already exists", serviceName, wantLb, *expectedRule.Name)
foundRule = true
}
if !foundRule {
glog.V(10).Infof("reconcile(%s)(%t): lb rule(%s) adding", serviceName, wantLb, *expectedRule.Name)
updatedRules = append(updatedRules, expectedRule)
dirtyRules = true
}
}
if dirtyRules {
dirtyLb = true
lb.LoadBalancingRules = &updatedRules
}
return lb, dirtyLb, nil
}
// This reconciles the Network Security Group similar to how the LB is reconciled.
// This entails adding required, missing SecurityRules and removing stale rules.
func (az *Cloud) reconcileSecurityGroup(sg network.SecurityGroup, clusterName string, service *v1.Service, wantLb bool) (network.SecurityGroup, bool, error) {
serviceName := getServiceName(service)
var ports []v1.ServicePort
if wantLb {
ports = service.Spec.Ports
} else {
ports = []v1.ServicePort{}
}
sourceRanges, err := serviceapi.GetLoadBalancerSourceRanges(service)
if err != nil {
return sg, false, err
}
var sourceAddressPrefixes []string
if sourceRanges == nil || serviceapi.IsAllowAll(sourceRanges) {
if !requiresInternalLoadBalancer(service) {
sourceAddressPrefixes = []string{"Internet"}
}
} else {
for _, ip := range sourceRanges {
sourceAddressPrefixes = append(sourceAddressPrefixes, ip.String())
}
}
expectedSecurityRules := make([]network.SecurityRule, len(ports)*len(sourceAddressPrefixes))
for i, port := range ports {
_, securityProto, _, err := getProtocolsFromKubernetesProtocol(port.Protocol)
if err != nil {
return sg, false, err
}
for j := range sourceAddressPrefixes {
ix := i*len(sourceAddressPrefixes) + j
securityRuleName := getSecurityRuleName(service, port, sourceAddressPrefixes[j])
expectedSecurityRules[ix] = network.SecurityRule{
Name: to.StringPtr(securityRuleName),
SecurityRulePropertiesFormat: &network.SecurityRulePropertiesFormat{
Protocol: *securityProto,
SourcePortRange: to.StringPtr("*"),
DestinationPortRange: to.StringPtr(strconv.Itoa(int(port.Port))),
SourceAddressPrefix: to.StringPtr(sourceAddressPrefixes[j]),
DestinationAddressPrefix: to.StringPtr("*"),
Access: network.SecurityRuleAccessAllow,
Direction: network.SecurityRuleDirectionInbound,
},
}
}
}
// update security rules
dirtySg := false
var updatedRules []network.SecurityRule
if sg.SecurityRules != nil {
updatedRules = *sg.SecurityRules
}
// update security rules: remove unwanted
for i := len(updatedRules) - 1; i >= 0; i-- {
existingRule := updatedRules[i]
if serviceOwnsRule(service, *existingRule.Name) {
glog.V(10).Infof("reconcile(%s)(%t): sg rule(%s) - considering evicting", serviceName, wantLb, *existingRule.Name)
keepRule := false
if findSecurityRule(expectedSecurityRules, existingRule) {
glog.V(10).Infof("reconcile(%s)(%t): sg rule(%s) - keeping", serviceName, wantLb, *existingRule.Name)
keepRule = true
}
if !keepRule {
glog.V(10).Infof("reconcile(%s)(%t): sg rule(%s) - dropping", serviceName, wantLb, *existingRule.Name)
updatedRules = append(updatedRules[:i], updatedRules[i+1:]...)
dirtySg = true
}
}
}
// update security rules: add needed
for _, expectedRule := range expectedSecurityRules {
foundRule := false
if findSecurityRule(updatedRules, expectedRule) {
glog.V(10).Infof("reconcile(%s)(%t): sg rule(%s) - already exists", serviceName, wantLb, *expectedRule.Name)
foundRule = true
}
if !foundRule {
glog.V(10).Infof("reconcile(%s)(%t): sg rule(%s) - adding", serviceName, wantLb, *expectedRule.Name)
nextAvailablePriority, err := getNextAvailablePriority(updatedRules)
if err != nil {
return sg, false, err
}
expectedRule.Priority = to.Int32Ptr(nextAvailablePriority)
updatedRules = append(updatedRules, expectedRule)
dirtySg = true
}
}
if dirtySg {
sg.SecurityRules = &updatedRules
}
return sg, dirtySg, nil
}
func findProbe(probes []network.Probe, probe network.Probe) bool {
for _, existingProbe := range probes {
if strings.EqualFold(*existingProbe.Name, *probe.Name) {
return true
}
}
return false
}
func findRule(rules []network.LoadBalancingRule, rule network.LoadBalancingRule) bool {
for _, existingRule := range rules {
if strings.EqualFold(*existingRule.Name, *rule.Name) {
return true
}
}
return false
}
func findSecurityRule(rules []network.SecurityRule, rule network.SecurityRule) bool {
for _, existingRule := range rules {
if strings.EqualFold(*existingRule.Name, *rule.Name) {
return true
}
}
return false
}
// This ensures the given VM's Primary NIC's Primary IP Configuration is
// participating in the specified LoadBalancer Backend Pool.
func (az *Cloud) ensureHostInPool(serviceName string, nodeName types.NodeName, backendPoolID string) error {
var machine compute.VirtualMachine
vmName := mapNodeNameToVMName(nodeName)
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("VirtualMachinesClient.Get(%q): start", vmName)
machine, err := az.VirtualMachinesClient.Get(az.ResourceGroup, vmName, "")
glog.V(10).Infof("VirtualMachinesClient.Get(%q): end", vmName)
if err != nil {
if az.CloudProviderBackoff {
glog.V(2).Infof("ensureHostInPool(%s, %s, %s) backing off", serviceName, nodeName, backendPoolID)
machine, err = az.VirtualMachineClientGetWithRetry(az.ResourceGroup, vmName, "")
if err != nil {
glog.V(2).Infof("ensureHostInPool(%s, %s, %s) abort backoff", serviceName, nodeName, backendPoolID)
return err
}
} else {
return err
}
}
primaryNicID, err := getPrimaryInterfaceID(machine)
if err != nil {
return err
}
nicName, err := getLastSegment(primaryNicID)
if err != nil {
return err
}
// Check availability set
if az.PrimaryAvailabilitySetName != "" {
expectedAvailabilitySetName := az.getAvailabilitySetID(az.PrimaryAvailabilitySetName)
if !strings.EqualFold(*machine.AvailabilitySet.ID, expectedAvailabilitySetName) {
glog.V(3).Infof(
"nicupdate(%s): skipping nic (%s) since it is not in the primaryAvailabilitSet(%s)",
serviceName, nicName, az.PrimaryAvailabilitySetName)
return nil
}
}
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("InterfacesClient.Get(%q): start", nicName)
nic, err := az.InterfacesClient.Get(az.ResourceGroup, nicName, "")
glog.V(10).Infof("InterfacesClient.Get(%q): end", nicName)
if err != nil {
return err
}
var primaryIPConfig *network.InterfaceIPConfiguration
primaryIPConfig, err = getPrimaryIPConfig(nic)
if err != nil {
return err
}
foundPool := false
newBackendPools := []network.BackendAddressPool{}
if primaryIPConfig.LoadBalancerBackendAddressPools != nil {
newBackendPools = *primaryIPConfig.LoadBalancerBackendAddressPools
}
for _, existingPool := range newBackendPools {
if strings.EqualFold(backendPoolID, *existingPool.ID) {
foundPool = true
break
}
}
if !foundPool {
newBackendPools = append(newBackendPools,
network.BackendAddressPool{
ID: to.StringPtr(backendPoolID),
})
primaryIPConfig.LoadBalancerBackendAddressPools = &newBackendPools
glog.V(3).Infof("nicupdate(%s): nic(%s) - updating", serviceName, nicName)
az.operationPollRateLimiter.Accept()
glog.V(10).Infof("InterfacesClient.CreateOrUpdate(%q): start", *nic.Name)
respChan, errChan := az.InterfacesClient.CreateOrUpdate(az.ResourceGroup, *nic.Name, nic, nil)
resp := <-respChan
err := <-errChan
glog.V(10).Infof("InterfacesClient.CreateOrUpdate(%q): end", *nic.Name)
if az.CloudProviderBackoff && shouldRetryAPIRequest(resp.Response, err) {
glog.V(2).Infof("nicupdate(%s) backing off: nic(%s) - updating, err=%v", serviceName, nicName, err)
retryErr := az.CreateOrUpdateInterfaceWithRetry(nic)
if retryErr != nil {
err = retryErr
glog.V(2).Infof("nicupdate(%s) abort backoff: nic(%s) - updating", serviceName, nicName)
}
}
if err != nil {
return err
}
}
return nil
}
// Check if service requires an internal load balancer.
func requiresInternalLoadBalancer(service *v1.Service) bool {
if l, ok := service.Annotations[ServiceAnnotationLoadBalancerInternal]; ok {
return l == "true"
}
return false
}