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azure.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"
"io"
"io/ioutil"
"strings"
"time"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/util/flowcontrol"
"k8s.io/kubernetes/pkg/cloudprovider"
"k8s.io/kubernetes/pkg/cloudprovider/providers/azure/auth"
"k8s.io/kubernetes/pkg/controller"
"k8s.io/kubernetes/pkg/version"
"github.com/Azure/go-autorest/autorest"
"github.com/Azure/go-autorest/autorest/azure"
"github.com/ghodss/yaml"
"github.com/golang/glog"
)
const (
// CloudProviderName is the value used for the --cloud-provider flag
CloudProviderName = "azure"
rateLimitQPSDefault = 1.0
rateLimitBucketDefault = 5
backoffRetriesDefault = 6
backoffExponentDefault = 1.5
backoffDurationDefault = 5 // in seconds
backoffJitterDefault = 1.0
maximumLoadBalancerRuleCount = 148 // According to Azure LB rule default limit
vmTypeVMSS = "vmss"
vmTypeStandard = "standard"
loadBalancerSkuBasic = "basic"
loadBalancerSkuStandard = "standard"
)
var (
// Master nodes are not added to standard load balancer by default.
defaultExcludeMasterFromStandardLB = true
)
// Config holds the configuration parsed from the --cloud-config flag
// All fields are required unless otherwise specified
type Config struct {
auth.AzureAuthConfig
// The name of the resource group that the cluster is deployed in
ResourceGroup string `json:"resourceGroup" yaml:"resourceGroup"`
// The location of the resource group that the cluster is deployed in
Location string `json:"location" yaml:"location"`
// The name of the VNet that the cluster is deployed in
VnetName string `json:"vnetName" yaml:"vnetName"`
// The name of the resource group that the Vnet is deployed in
VnetResourceGroup string `json:"vnetResourceGroup" yaml:"vnetResourceGroup"`
// The name of the subnet that the cluster is deployed in
SubnetName string `json:"subnetName" yaml:"subnetName"`
// The name of the security group attached to the cluster's subnet
SecurityGroupName string `json:"securityGroupName" yaml:"securityGroupName"`
// (Optional in 1.6) The name of the route table attached to the subnet that the cluster is deployed in
RouteTableName string `json:"routeTableName" yaml:"routeTableName"`
// (Optional) The name of the availability set that should be used as the load balancer backend
// If this is set, the Azure cloudprovider will only add nodes from that availability set to the load
// balancer backend pool. If this is not set, and multiple agent pools (availability sets) are used, then
// the cloudprovider will try to add all nodes to a single backend pool which is forbidden.
// In other words, if you use multiple agent pools (availability sets), you MUST set this field.
PrimaryAvailabilitySetName string `json:"primaryAvailabilitySetName" yaml:"primaryAvailabilitySetName"`
// The type of azure nodes. Candidate values are: vmss and standard.
// If not set, it will be default to standard.
VMType string `json:"vmType" yaml:"vmType"`
// The name of the scale set that should be used as the load balancer backend.
// If this is set, the Azure cloudprovider will only add nodes from that scale set to the load
// balancer backend pool. If this is not set, and multiple agent pools (scale sets) are used, then
// the cloudprovider will try to add all nodes to a single backend pool which is forbidden.
// In other words, if you use multiple agent pools (scale sets), you MUST set this field.
PrimaryScaleSetName string `json:"primaryScaleSetName" yaml:"primaryScaleSetName"`
// Enable exponential backoff to manage resource request retries
CloudProviderBackoff bool `json:"cloudProviderBackoff" yaml:"cloudProviderBackoff"`
// Backoff retry limit
CloudProviderBackoffRetries int `json:"cloudProviderBackoffRetries" yaml:"cloudProviderBackoffRetries"`
// Backoff exponent
CloudProviderBackoffExponent float64 `json:"cloudProviderBackoffExponent" yaml:"cloudProviderBackoffExponent"`
// Backoff duration
CloudProviderBackoffDuration int `json:"cloudProviderBackoffDuration" yaml:"cloudProviderBackoffDuration"`
// Backoff jitter
CloudProviderBackoffJitter float64 `json:"cloudProviderBackoffJitter" yaml:"cloudProviderBackoffJitter"`
// Enable rate limiting
CloudProviderRateLimit bool `json:"cloudProviderRateLimit" yaml:"cloudProviderRateLimit"`
// Rate limit QPS (Read)
CloudProviderRateLimitQPS float32 `json:"cloudProviderRateLimitQPS" yaml:"cloudProviderRateLimitQPS"`
// Rate limit Bucket Size
CloudProviderRateLimitBucket int `json:"cloudProviderRateLimitBucket" yaml:"cloudProviderRateLimitBucket"`
// Rate limit QPS (Write)
CloudProviderRateLimitQPSWrite float32 `json:"cloudProviderRateLimitQPSWrite" yaml:"cloudProviderRateLimitQPSWrite"`
// Rate limit Bucket Size
CloudProviderRateLimitBucketWrite int `json:"cloudProviderRateLimitBucketWrite" yaml:"cloudProviderRateLimitBucketWrite"`
// Use instance metadata service where possible
UseInstanceMetadata bool `json:"useInstanceMetadata" yaml:"useInstanceMetadata"`
// Sku of Load Balancer and Public IP. Candidate values are: basic and standard.
// If not set, it will be default to basic.
LoadBalancerSku string `json:"loadBalancerSku" yaml:"loadBalancerSku"`
// ExcludeMasterFromStandardLB excludes master nodes from standard load balancer.
// If not set, it will be default to true.
ExcludeMasterFromStandardLB *bool `json:"excludeMasterFromStandardLB" yaml:"excludeMasterFromStandardLB"`
// Maximum allowed LoadBalancer Rule Count is the limit enforced by Azure Load balancer
MaximumLoadBalancerRuleCount int `json:"maximumLoadBalancerRuleCount" yaml:"maximumLoadBalancerRuleCount"`
}
// Cloud holds the config and clients
type Cloud struct {
Config
Environment azure.Environment
RoutesClient RoutesClient
SubnetsClient SubnetsClient
InterfacesClient InterfacesClient
RouteTablesClient RouteTablesClient
LoadBalancerClient LoadBalancersClient
PublicIPAddressesClient PublicIPAddressesClient
SecurityGroupsClient SecurityGroupsClient
VirtualMachinesClient VirtualMachinesClient
StorageAccountClient StorageAccountClient
DisksClient DisksClient
FileClient FileClient
resourceRequestBackoff wait.Backoff
metadata *InstanceMetadata
vmSet VMSet
// Clients for vmss.
VirtualMachineScaleSetsClient VirtualMachineScaleSetsClient
VirtualMachineScaleSetVMsClient VirtualMachineScaleSetVMsClient
vmCache *timedCache
lbCache *timedCache
nsgCache *timedCache
rtCache *timedCache
*BlobDiskController
*ManagedDiskController
*controllerCommon
}
func init() {
cloudprovider.RegisterCloudProvider(CloudProviderName, NewCloud)
}
// NewCloud returns a Cloud with initialized clients
func NewCloud(configReader io.Reader) (cloudprovider.Interface, error) {
config, err := parseConfig(configReader)
if err != nil {
return nil, err
}
if config.VMType == "" {
// default to standard vmType if not set.
config.VMType = vmTypeStandard
}
env, err := auth.ParseAzureEnvironment(config.Cloud)
if err != nil {
return nil, err
}
servicePrincipalToken, err := auth.GetServicePrincipalToken(&config.AzureAuthConfig, env)
if err != nil {
return nil, err
}
// operationPollRateLimiter.Accept() is a no-op if rate limits are configured off.
operationPollRateLimiter := flowcontrol.NewFakeAlwaysRateLimiter()
operationPollRateLimiterWrite := flowcontrol.NewFakeAlwaysRateLimiter()
// If reader is provided (and no writer) we will
// use the same value for both.
if config.CloudProviderRateLimit {
// Assign rate limit defaults if no configuration was passed in
if config.CloudProviderRateLimitQPS == 0 {
config.CloudProviderRateLimitQPS = rateLimitQPSDefault
}
if config.CloudProviderRateLimitBucket == 0 {
config.CloudProviderRateLimitBucket = rateLimitBucketDefault
}
if config.CloudProviderRateLimitQPSWrite == 0 {
config.CloudProviderRateLimitQPSWrite = rateLimitQPSDefault
}
if config.CloudProviderRateLimitBucketWrite == 0 {
config.CloudProviderRateLimitBucketWrite = rateLimitBucketDefault
}
operationPollRateLimiter = flowcontrol.NewTokenBucketRateLimiter(
config.CloudProviderRateLimitQPS,
config.CloudProviderRateLimitBucket)
operationPollRateLimiterWrite = flowcontrol.NewTokenBucketRateLimiter(
config.CloudProviderRateLimitQPSWrite,
config.CloudProviderRateLimitBucketWrite)
glog.V(2).Infof("Azure cloudprovider (read ops) using rate limit config: QPS=%g, bucket=%d",
config.CloudProviderRateLimitQPS,
config.CloudProviderRateLimitBucket)
glog.V(2).Infof("Azure cloudprovider (write ops) using rate limit config: QPS=%g, bucket=%d",
config.CloudProviderRateLimitQPSWrite,
config.CloudProviderRateLimitBucketWrite)
}
// Do not add master nodes to standard LB by default.
if config.ExcludeMasterFromStandardLB == nil {
config.ExcludeMasterFromStandardLB = &defaultExcludeMasterFromStandardLB
}
azClientConfig := &azClientConfig{
subscriptionID: config.SubscriptionID,
resourceManagerEndpoint: env.ResourceManagerEndpoint,
servicePrincipalToken: servicePrincipalToken,
rateLimiterReader: operationPollRateLimiter,
rateLimiterWriter: operationPollRateLimiterWrite,
}
az := Cloud{
Config: *config,
Environment: *env,
DisksClient: newAzDisksClient(azClientConfig),
RoutesClient: newAzRoutesClient(azClientConfig),
SubnetsClient: newAzSubnetsClient(azClientConfig),
InterfacesClient: newAzInterfacesClient(azClientConfig),
RouteTablesClient: newAzRouteTablesClient(azClientConfig),
LoadBalancerClient: newAzLoadBalancersClient(azClientConfig),
SecurityGroupsClient: newAzSecurityGroupsClient(azClientConfig),
StorageAccountClient: newAzStorageAccountClient(azClientConfig),
VirtualMachinesClient: newAzVirtualMachinesClient(azClientConfig),
PublicIPAddressesClient: newAzPublicIPAddressesClient(azClientConfig),
VirtualMachineScaleSetsClient: newAzVirtualMachineScaleSetsClient(azClientConfig),
VirtualMachineScaleSetVMsClient: newAzVirtualMachineScaleSetVMsClient(azClientConfig),
FileClient: &azureFileClient{env: *env},
}
// Conditionally configure resource request backoff
if az.CloudProviderBackoff {
// Assign backoff defaults if no configuration was passed in
if az.CloudProviderBackoffRetries == 0 {
az.CloudProviderBackoffRetries = backoffRetriesDefault
}
if az.CloudProviderBackoffExponent == 0 {
az.CloudProviderBackoffExponent = backoffExponentDefault
}
if az.CloudProviderBackoffDuration == 0 {
az.CloudProviderBackoffDuration = backoffDurationDefault
}
if az.CloudProviderBackoffJitter == 0 {
az.CloudProviderBackoffJitter = backoffJitterDefault
}
az.resourceRequestBackoff = wait.Backoff{
Steps: az.CloudProviderBackoffRetries,
Factor: az.CloudProviderBackoffExponent,
Duration: time.Duration(az.CloudProviderBackoffDuration) * time.Second,
Jitter: az.CloudProviderBackoffJitter,
}
glog.V(2).Infof("Azure cloudprovider using retry backoff: retries=%d, exponent=%f, duration=%d, jitter=%f",
az.CloudProviderBackoffRetries,
az.CloudProviderBackoffExponent,
az.CloudProviderBackoffDuration,
az.CloudProviderBackoffJitter)
}
az.metadata = NewInstanceMetadata()
if az.MaximumLoadBalancerRuleCount == 0 {
az.MaximumLoadBalancerRuleCount = maximumLoadBalancerRuleCount
}
if strings.EqualFold(vmTypeVMSS, az.Config.VMType) {
az.vmSet, err = newScaleSet(&az)
if err != nil {
return nil, err
}
} else {
az.vmSet = newAvailabilitySet(&az)
}
az.vmCache, err = az.newVMCache()
if err != nil {
return nil, err
}
az.lbCache, err = az.newLBCache()
if err != nil {
return nil, err
}
az.nsgCache, err = az.newNSGCache()
if err != nil {
return nil, err
}
az.rtCache, err = az.newRouteTableCache()
if err != nil {
return nil, err
}
if err := initDiskControllers(&az); err != nil {
return nil, err
}
return &az, nil
}
// parseConfig returns a parsed configuration for an Azure cloudprovider config file
func parseConfig(configReader io.Reader) (*Config, error) {
var config Config
if configReader == nil {
return &config, nil
}
configContents, err := ioutil.ReadAll(configReader)
if err != nil {
return nil, err
}
err = yaml.Unmarshal(configContents, &config)
if err != nil {
return nil, err
}
return &config, nil
}
// Initialize passes a Kubernetes clientBuilder interface to the cloud provider
func (az *Cloud) Initialize(clientBuilder controller.ControllerClientBuilder) {}
// LoadBalancer returns a balancer interface. Also returns true if the interface is supported, false otherwise.
func (az *Cloud) LoadBalancer() (cloudprovider.LoadBalancer, bool) {
return az, true
}
// Instances returns an instances interface. Also returns true if the interface is supported, false otherwise.
func (az *Cloud) Instances() (cloudprovider.Instances, bool) {
return az, true
}
// Zones returns a zones interface. Also returns true if the interface is supported, false otherwise.
func (az *Cloud) Zones() (cloudprovider.Zones, bool) {
return az, true
}
// Clusters returns a clusters interface. Also returns true if the interface is supported, false otherwise.
func (az *Cloud) Clusters() (cloudprovider.Clusters, bool) {
return nil, false
}
// Routes returns a routes interface along with whether the interface is supported.
func (az *Cloud) Routes() (cloudprovider.Routes, bool) {
return az, true
}
// HasClusterID returns true if the cluster has a clusterID
func (az *Cloud) HasClusterID() bool {
return true
}
// ProviderName returns the cloud provider ID.
func (az *Cloud) ProviderName() string {
return CloudProviderName
}
// configureUserAgent configures the autorest client with a user agent that
// includes "kubernetes" and the full kubernetes git version string
// example:
// Azure-SDK-for-Go/7.0.1-beta arm-network/2016-09-01; kubernetes-cloudprovider/v1.7.0-alpha.2.711+a2fadef8170bb0-dirty;
func configureUserAgent(client *autorest.Client) {
k8sVersion := version.Get().GitVersion
client.UserAgent = fmt.Sprintf("%s; kubernetes-cloudprovider/%s", client.UserAgent, k8sVersion)
}
func initDiskControllers(az *Cloud) error {
// Common controller contains the function
// needed by both blob disk and managed disk controllers
common := &controllerCommon{
location: az.Location,
storageEndpointSuffix: az.Environment.StorageEndpointSuffix,
resourceGroup: az.ResourceGroup,
subscriptionID: az.SubscriptionID,
cloud: az,
}
// BlobDiskController: contains the function needed to
// create/attach/detach/delete blob based (unmanaged disks)
blobController, err := newBlobDiskController(common)
if err != nil {
return fmt.Errorf("AzureDisk - failed to init Blob Disk Controller with error (%s)", err.Error())
}
// ManagedDiskController: contains the functions needed to
// create/attach/detach/delete managed disks
managedController, err := newManagedDiskController(common)
if err != nil {
return fmt.Errorf("AzureDisk - failed to init Managed Disk Controller with error (%s)", err.Error())
}
az.BlobDiskController = blobController
az.ManagedDiskController = managedController
az.controllerCommon = common
return nil
}