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# Contributing guidelines
Welcome to Kubernetes. We are excited about the prospect of you joining our [community](https://github.com/kubernetes/community)! The Kubernetes community abides by the CNCF [code of conduct](code-of-conduct.md).
Do not open pull requests directly against this repository, they will be ignored. Instead, please open pull requests against [kubernetes/kubernetes](https://git.k8s.io/kubernetes/). Please follow the same [contributing guide](https://git.k8s.io/kubernetes/CONTRIBUTING.md) you would follow for any other pull request made to kubernetes/kubernetes. Changes to this repo should be discussed with [sig cloud-provider](https://github.com/kubernetes/community/tree/master/sig-cloud-provider).
This repository is published from [kubernetes/kubernetes/staging/src/k8s.io/cloud-provider](https://git.k8s.io/kubernetes/staging/src/k8s.io/cloud-provider) by the [kubernetes publishing-bot](https://git.k8s.io/publishing-bot).
Please see [Staging Directory and Publishing](https://git.k8s.io/community/contributors/devel/staging.md) for more information

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approvers:
- mikedanese
- dims
- wlan0
- andrewsykim
- cheftako
reviewers:
- wojtek-t
- deads2k
- derekwaynecarr
- vishh
- mikedanese
- liggitt
- gmarek
- davidopp
- pmorie
- sttts
- quinton-hoole
- dchen1107
- saad-ali
- zmerlynn
- luxas
- justinsb
- roberthbailey
- eparis
- jlowdermilk
- piosz
- jsafrane
- dims
- krousey
- rootfs
- jszczepkowski
- markturansky
- girishkalele
- jdef
- freehan
- jingxu97
- wlan0
- cheftako
- andrewsykim
labels:
- sig/cloud-provider

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# cloud-provider
This repository defines the cloud-provider interface and mechanism to initialize
a cloud-provider implementation into Kubernetes. Currently multiple processes
use this code although the intent is that it will eventually only be cloud
controller manager.
**Note:** go-get or vendor this package as `k8s.io/cloud-provider`.
## Purpose
This library is a shared dependency for processes which need to be able to
integrate with cloud-provider specific functionality.
## Compatibility
Cloud Providers are expected to keep the HEAD of their implementations in sync
with the HEAD of this repository.
## Where does it come from?
`cloud-provider` is synced from
https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/cloud-provider.
Code changes are made in that location, merged into k8s.io/kubernetes and
later synced here.
## Things you should NOT do
1. Add an cloud provider specific code to this repo.
2. Directly modify anything under vendor/k8s.io/cloud-provider in this repo. Those are driven from `k8s.io/kubernetes/staging/src/k8s.io/cloud-provider`.
3. Make interface changes without first discussing them with
sig-cloudprovider.

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# Defined below are the security contacts for this repo.
#
# They are the contact point for the Product Security Team to reach out
# to for triaging and handling of incoming issues.
#
# The below names agree to abide by the
# [Embargo Policy](https://github.com/kubernetes/sig-release/blob/master/security-release-process-documentation/security-release-process.md#embargo-policy)
# and will be removed and replaced if they violate that agreement.
#
# DO NOT REPORT SECURITY VULNERABILITIES DIRECTLY TO THESE NAMES, FOLLOW THE
# INSTRUCTIONS AT https://kubernetes.io/security/
cheftako
andrewsykim
dims

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/*
Copyright 2014 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 cloudprovider
import (
"context"
"errors"
"fmt"
"strings"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/informers"
clientset "k8s.io/client-go/kubernetes"
restclient "k8s.io/client-go/rest"
)
// ControllerClientBuilder allows you to get clients and configs for controllers
// Please note a copy also exists in pkg/controller/client_builder.go
// TODO: Make this depend on the separate controller utilities repo (issues/68947)
type ControllerClientBuilder interface {
Config(name string) (*restclient.Config, error)
ConfigOrDie(name string) *restclient.Config
Client(name string) (clientset.Interface, error)
ClientOrDie(name string) clientset.Interface
}
// Interface is an abstract, pluggable interface for cloud providers.
type Interface interface {
// Initialize provides the cloud with a kubernetes client builder and may spawn goroutines
// to perform housekeeping or run custom controllers specific to the cloud provider.
// Any tasks started here should be cleaned up when the stop channel closes.
Initialize(clientBuilder ControllerClientBuilder, stop <-chan struct{})
// LoadBalancer returns a balancer interface. Also returns true if the interface is supported, false otherwise.
LoadBalancer() (LoadBalancer, bool)
// Instances returns an instances interface. Also returns true if the interface is supported, false otherwise.
Instances() (Instances, bool)
// Zones returns a zones interface. Also returns true if the interface is supported, false otherwise.
Zones() (Zones, bool)
// Clusters returns a clusters interface. Also returns true if the interface is supported, false otherwise.
Clusters() (Clusters, bool)
// Routes returns a routes interface along with whether the interface is supported.
Routes() (Routes, bool)
// ProviderName returns the cloud provider ID.
ProviderName() string
// HasClusterID returns true if a ClusterID is required and set
HasClusterID() bool
}
type InformerUser interface {
// SetInformers sets the informer on the cloud object.
SetInformers(informerFactory informers.SharedInformerFactory)
}
// Clusters is an abstract, pluggable interface for clusters of containers.
type Clusters interface {
// ListClusters lists the names of the available clusters.
ListClusters(ctx context.Context) ([]string, error)
// Master gets back the address (either DNS name or IP address) of the master node for the cluster.
Master(ctx context.Context, clusterName string) (string, error)
}
// (DEPRECATED) DefaultLoadBalancerName is the default load balancer name that is called from
// LoadBalancer.GetLoadBalancerName. Use this method to maintain backward compatible names for
// LoadBalancers that were created prior to Kubernetes v1.12. In the future, each provider should
// replace this method call in GetLoadBalancerName with a provider-specific implementation that
// is less cryptic than the Service's UUID.
func DefaultLoadBalancerName(service *v1.Service) string {
//GCE requires that the name of a load balancer starts with a lower case letter.
ret := "a" + string(service.UID)
ret = strings.Replace(ret, "-", "", -1)
//AWS requires that the name of a load balancer is shorter than 32 bytes.
if len(ret) > 32 {
ret = ret[:32]
}
return ret
}
// GetInstanceProviderID builds a ProviderID for a node in a cloud.
func GetInstanceProviderID(ctx context.Context, cloud Interface, nodeName types.NodeName) (string, error) {
instances, ok := cloud.Instances()
if !ok {
return "", fmt.Errorf("failed to get instances from cloud provider")
}
instanceID, err := instances.InstanceID(ctx, nodeName)
if err != nil {
return "", fmt.Errorf("failed to get instance ID from cloud provider: %v", err)
}
return cloud.ProviderName() + "://" + instanceID, nil
}
// LoadBalancer is an abstract, pluggable interface for load balancers.
type LoadBalancer interface {
// TODO: Break this up into different interfaces (LB, etc) when we have more than one type of service
// 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
GetLoadBalancer(ctx context.Context, clusterName string, service *v1.Service) (status *v1.LoadBalancerStatus, exists bool, err error)
// GetLoadBalancerName returns the name of the load balancer. Implementations must treat the
// *v1.Service parameter as read-only and not modify it.
GetLoadBalancerName(ctx context.Context, clusterName string, service *v1.Service) string
// 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
EnsureLoadBalancer(ctx context.Context, clusterName string, service *v1.Service, nodes []*v1.Node) (*v1.LoadBalancerStatus, error)
// 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
UpdateLoadBalancer(ctx context.Context, clusterName string, service *v1.Service, nodes []*v1.Node) error
// 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
EnsureLoadBalancerDeleted(ctx context.Context, clusterName string, service *v1.Service) error
}
// Instances is an abstract, pluggable interface for sets of instances.
type Instances interface {
// NodeAddresses returns the addresses of the specified instance.
// TODO(roberthbailey): This currently is only used in such a way that it
// returns the address of the calling instance. We should do a rename to
// make this clearer.
NodeAddresses(ctx context.Context, name types.NodeName) ([]v1.NodeAddress, error)
// NodeAddressesByProviderID returns the addresses of the specified instance.
// The instance is specified using the providerID of the node. The
// ProviderID is a unique identifier of the node. This will not be called
// from the node whose nodeaddresses are being queried. i.e. local metadata
// services cannot be used in this method to obtain nodeaddresses
NodeAddressesByProviderID(ctx context.Context, providerID string) ([]v1.NodeAddress, error)
// InstanceID returns the cloud provider ID of the node with the specified NodeName.
// Note that if the instance does not exist, we must return ("", cloudprovider.InstanceNotFound)
// cloudprovider.InstanceNotFound should NOT be returned for instances that exist but are stopped/sleeping
InstanceID(ctx context.Context, nodeName types.NodeName) (string, error)
// InstanceType returns the type of the specified instance.
InstanceType(ctx context.Context, name types.NodeName) (string, error)
// InstanceTypeByProviderID returns the type of the specified instance.
InstanceTypeByProviderID(ctx context.Context, providerID string) (string, error)
// AddSSHKeyToAllInstances adds an SSH public key as a legal identity for all instances
// expected format for the key is standard ssh-keygen format: <protocol> <blob>
AddSSHKeyToAllInstances(ctx context.Context, user string, keyData []byte) error
// CurrentNodeName returns the name of the node we are currently running on
// On most clouds (e.g. GCE) this is the hostname, so we provide the hostname
CurrentNodeName(ctx context.Context, hostname string) (types.NodeName, error)
// InstanceExistsByProviderID returns true if the instance for the given provider exists.
// If false is returned with no error, the instance will be immediately deleted by the cloud controller manager.
// This method should still return true for instances that exist but are stopped/sleeping.
InstanceExistsByProviderID(ctx context.Context, providerID string) (bool, error)
// InstanceShutdownByProviderID returns true if the instance is shutdown in cloudprovider
InstanceShutdownByProviderID(ctx context.Context, providerID string) (bool, error)
}
// Route is a representation of an advanced routing rule.
type Route struct {
// Name is the name of the routing rule in the cloud-provider.
// It will be ignored in a Create (although nameHint may influence it)
Name string
// TargetNode is the NodeName of the target instance.
TargetNode types.NodeName
// DestinationCIDR is the CIDR format IP range that this routing rule
// applies to.
DestinationCIDR string
// Blackhole is set to true if this is a blackhole route
// The node controller will delete the route if it is in the managed range.
Blackhole bool
}
// Routes is an abstract, pluggable interface for advanced routing rules.
type Routes interface {
// ListRoutes lists all managed routes that belong to the specified clusterName
ListRoutes(ctx context.Context, clusterName string) ([]*Route, error)
// CreateRoute creates the described managed route
// route.Name will be ignored, although the cloud-provider may use nameHint
// to create a more user-meaningful name.
CreateRoute(ctx context.Context, clusterName string, nameHint string, route *Route) error
// DeleteRoute deletes the specified managed route
// Route should be as returned by ListRoutes
DeleteRoute(ctx context.Context, clusterName string, route *Route) error
}
var (
InstanceNotFound = errors.New("instance not found")
DiskNotFound = errors.New("disk is not found")
NotImplemented = errors.New("unimplemented")
)
// Zone represents the location of a particular machine.
type Zone struct {
FailureDomain string
Region string
}
// Zones is an abstract, pluggable interface for zone enumeration.
type Zones interface {
// GetZone returns the Zone containing the current failure zone and locality region that the program is running in
// In most cases, this method is called from the kubelet querying a local metadata service to acquire its zone.
// For the case of external cloud providers, use GetZoneByProviderID or GetZoneByNodeName since GetZone
// can no longer be called from the kubelets.
GetZone(ctx context.Context) (Zone, error)
// GetZoneByProviderID returns the Zone containing the current zone and locality region of the node specified by providerID
// This method is particularly used in the context of external cloud providers where node initialization must be done
// outside the kubelets.
GetZoneByProviderID(ctx context.Context, providerID string) (Zone, error)
// GetZoneByNodeName returns the Zone containing the current zone and locality region of the node specified by node name
// This method is particularly used in the context of external cloud providers where node initialization must be done
// outside the kubelets.
GetZoneByNodeName(ctx context.Context, nodeName types.NodeName) (Zone, error)
}
// PVLabeler is an abstract, pluggable interface for fetching labels for volumes
type PVLabeler interface {
GetLabelsForVolume(ctx context.Context, pv *v1.PersistentVolume) (map[string]string, error)
}

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# Kubernetes Community Code of Conduct
Please refer to our [Kubernetes Community Code of Conduct](https://git.k8s.io/community/code-of-conduct.md)

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/*
Copyright 2014 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 cloudprovider supplies interfaces and implementations for cloud service providers.
package cloudprovider // import "k8s.io/cloud-provider"

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/*
Copyright 2014 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 cloudprovider
import (
"fmt"
"io"
"os"
"sync"
"k8s.io/klog"
)
// Factory is a function that returns a cloudprovider.Interface.
// The config parameter provides an io.Reader handler to the factory in
// order to load specific configurations. If no configuration is provided
// the parameter is nil.
type Factory func(config io.Reader) (Interface, error)
// All registered cloud providers.
var (
providersMutex sync.Mutex
providers = make(map[string]Factory)
deprecatedCloudProviders = []struct {
name string
external bool
detail string
}{
{"aws", false, "The AWS provider is deprecated and will be removed in a future release"},
{"azure", false, "The Azure provider is deprecated and will be removed in a future release"},
{"cloudstack", false, "The CloudStack Controller project is no longer maintained."},
{"gce", false, "The GCE provider is deprecated and will be removed in a future release"},
{"openstack", true, "https://github.com/kubernetes/cloud-provider-openstack"},
{"ovirt", false, "The ovirt Controller project is no longer maintained."},
{"photon", false, "The Photon Controller project is no longer maintained."},
{"vsphere", false, "The vSphere provider is deprecated and will be removed in a future release"},
}
)
const externalCloudProvider = "external"
// RegisterCloudProvider registers a cloudprovider.Factory by name. This
// is expected to happen during app startup.
func RegisterCloudProvider(name string, cloud Factory) {
providersMutex.Lock()
defer providersMutex.Unlock()
if _, found := providers[name]; found {
klog.Fatalf("Cloud provider %q was registered twice", name)
}
klog.V(1).Infof("Registered cloud provider %q", name)
providers[name] = cloud
}
// IsCloudProvider returns true if name corresponds to an already registered
// cloud provider.
func IsCloudProvider(name string) bool {
providersMutex.Lock()
defer providersMutex.Unlock()
_, found := providers[name]
return found
}
// GetCloudProvider creates an instance of the named cloud provider, or nil if
// the name is unknown. The error return is only used if the named provider
// was known but failed to initialize. The config parameter specifies the
// io.Reader handler of the configuration file for the cloud provider, or nil
// for no configuration.
func GetCloudProvider(name string, config io.Reader) (Interface, error) {
providersMutex.Lock()
defer providersMutex.Unlock()
f, found := providers[name]
if !found {
return nil, nil
}
return f(config)
}
// Detects if the string is an external cloud provider
func IsExternal(name string) bool {
return name == externalCloudProvider
}
// InitCloudProvider creates an instance of the named cloud provider.
func InitCloudProvider(name string, configFilePath string) (Interface, error) {
var cloud Interface
var err error
if name == "" {
klog.Info("No cloud provider specified.")
return nil, nil
}
if IsExternal(name) {
klog.Info("External cloud provider specified")
return nil, nil
}
for _, provider := range deprecatedCloudProviders {
if provider.name == name {
detail := provider.detail
if provider.external {
detail = fmt.Sprintf("Please use 'external' cloud provider for %s: %s", name, provider.detail)
}
klog.Warningf("WARNING: %s built-in cloud provider is now deprecated. %s", name, detail)
break
}
}
if configFilePath != "" {
var config *os.File
config, err = os.Open(configFilePath)
if err != nil {
klog.Fatalf("Couldn't open cloud provider configuration %s: %#v",
configFilePath, err)
}
defer config.Close()
cloud, err = GetCloudProvider(name, config)
} else {
// Pass explicit nil so plugins can actually check for nil. See
// "Why is my nil error value not equal to nil?" in golang.org/doc/faq.
cloud, err = GetCloudProvider(name, nil)
}
if err != nil {
return nil, fmt.Errorf("could not init cloud provider %q: %v", name, err)
}
if cloud == nil {
return nil, fmt.Errorf("unknown cloud provider %q", name)
}
return cloud, nil
}