cloudprovider

README

Deprecation Notice: This directory has entered maintenance mode and will not be accepting new providers. Cloud Providers in this directory will continue to be actively developed or maintained and supported at their current level of support as a longer-term solution evolves.

Overview:

The mechanism for supporting cloud providers is currently in transition: the original method of implementing cloud provider-specific functionality within the main kubernetes tree (here) is no longer advised; however, the proposed solution is still in development.

Guidance for potential cloud providers:

• Support for cloud providers is currently in a state of flux. Background information on motivation and the proposal for improving is in the github proposal.
• In support of this plan, a new cloud-controller-manager binary was added in 1.6. This was the first of several steps (see the proposal for more information).
• Attempts to contribute new cloud providers or (to a lesser extent) persistent volumes to the core repo will likely meet with some pushback from reviewers/approvers.
• It is understood that this is an unfortunate situation in which 'the old way is no longer supported but the new way is not ready yet', but the initial path is unsustainable, and contributors are encouraged to participate in the implementation of the proposed long-term solution, as there is risk that PRs for new cloud providers here will not be approved.
• Though the fully productized support envisioned in the proposal is still 2 - 3 releases out, the foundational work is underway, and a motivated cloud provider could accomplish the work in a forward-looking way. Contributors are encouraged to assist with the implementation of the design outlined in the proposal.

Some additional context on status / direction:

• 1.6 added a new cloud-controller-manager binary that may be used for testing the new out-of-core cloudprovider flow.
• Setting cloud-provider=external allows for creation of a separate controller-manager binary
• 1.7 adds extensible admission control, further enabling topology customization.

Documentation

Overview

Package cloudprovider supplies interfaces and implementations for cloud service providers.

Index

• Variables
• func CloudProviders() []string
• func GetInstanceProviderID(cloud Interface, nodeName types.NodeName) (string, error)
• func GetLoadBalancerName(service *v1.Service) string
• func IsCloudProvider(name string) bool
• func IsExternal(name string) bool
• func RegisterCloudProvider(name string, cloud Factory)
• type Clusters
• type Factory
• type Instances
• type Interface
  • func GetCloudProvider(name string, config io.Reader) (Interface, error)
  • func InitCloudProvider(name string, configFilePath string) (Interface, error)
• type LoadBalancer
• type PVLabeler
• type Route
• type Routes
• type Zone
• type Zones

Variables

var (
	InstanceNotFound = errors.New("instance not found")
	DiskNotFound     = errors.New("disk is not found")
	NotImplemented   = errors.New("unimplemented")
)

Functions

func CloudProviders

func CloudProviders() []string

CloudProviders returns the name of all registered cloud providers in a string slice

func GetInstanceProviderID

func GetInstanceProviderID(cloud Interface, nodeName types.NodeName) (string, error)

GetInstanceProviderID builds a ProviderID for a node in a cloud.

func GetLoadBalancerName

func GetLoadBalancerName(service *v1.Service) string

TODO(#6812): Use a shorter name that's less likely to be longer than cloud providers' name length limits.

func IsCloudProvider

func IsCloudProvider(name string) bool

IsCloudProvider returns true if name corresponds to an already registered cloud provider.

func IsExternal

func IsExternal(name string) bool

Detects if the string is an external cloud provider

func RegisterCloudProvider

func RegisterCloudProvider(name string, cloud Factory)

RegisterCloudProvider registers a cloudprovider.Factory by name. This is expected to happen during app startup.

Types

type Clusters

type Clusters interface {
	// ListClusters lists the names of the available clusters.
	ListClusters() ([]string, error)
	// Master gets back the address (either DNS name or IP address) of the master node for the cluster.
	Master(clusterName string) (string, error)
}

Clusters is an abstract, pluggable interface for clusters of containers.

type Factory

type Factory func(config io.Reader) (Interface, error)

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 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(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(providerID string) ([]v1.NodeAddress, error)
	// ExternalID returns the cloud provider ID of the node with the specified NodeName.
	// Note that if the instance does not exist or is no longer running, we must return ("", cloudprovider.InstanceNotFound)
	ExternalID(nodeName types.NodeName) (string, error)
	// InstanceID returns the cloud provider ID of the node with the specified NodeName.
	InstanceID(nodeName types.NodeName) (string, error)
	// InstanceType returns the type of the specified instance.
	InstanceType(name types.NodeName) (string, error)
	// InstanceTypeByProviderID returns the type of the specified instance.
	InstanceTypeByProviderID(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(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(hostname string) (types.NodeName, error)
	// InstanceExistsByProviderID returns true if the instance for the given provider id still is running.
	// If false is returned with no error, the instance will be immediately deleted by the cloud controller manager.
	InstanceExistsByProviderID(providerID string) (bool, error)
}

Instances is an abstract, pluggable interface for sets of instances.

type Interface

type Interface interface {
	// Initialize provides the cloud with a kubernetes client builder and may spawn goroutines
	// to perform housekeeping activities within the cloud provider.
	Initialize(clientBuilder controller.ControllerClientBuilder)
	// 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
	// ScrubDNS provides an opportunity for cloud-provider-specific code to process DNS settings for pods.
	ScrubDNS(nameservers, searches []string) (nsOut, srchOut []string)
	// HasClusterID returns true if a ClusterID is required and set
	HasClusterID() bool
}

Interface is an abstract, pluggable interface for cloud providers.

func GetCloudProvider

func GetCloudProvider(name string, config io.Reader) (Interface, error)

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 configuation.

func InitCloudProvider

func InitCloudProvider(name string, configFilePath string) (Interface, error)

InitCloudProvider creates an instance of the named cloud provider.

type LoadBalancer

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(clusterName string, service *v1.Service) (status *v1.LoadBalancerStatus, exists bool, err error)
	// 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(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(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(clusterName string, service *v1.Service) error
}

LoadBalancer is an abstract, pluggable interface for load balancers.

type PVLabeler

type PVLabeler interface {
	GetLabelsForVolume(pv *v1.PersistentVolume) (map[string]string, error)
}

PVLabeler is an abstract, pluggable interface for fetching labels for volumes

type Route

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
}

Route is a representation of an advanced routing rule.

type Routes

type Routes interface {
	// ListRoutes lists all managed routes that belong to the specified clusterName
	ListRoutes(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(clusterName string, nameHint string, route *Route) error
	// DeleteRoute deletes the specified managed route
	// Route should be as returned by ListRoutes
	DeleteRoute(clusterName string, route *Route) error
}

Routes is an abstract, pluggable interface for advanced routing rules.

type Zone

type Zone struct {
	FailureDomain string
	Region        string
}

Zone represents the location of a particular machine.

type Zones

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 aquire its zone.
	// For the case of external cloud providers, use GetZoneByProviderID or GetZoneByNodeName since GetZone
	// can no longer be called from the kubelets.
	GetZone() (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 down
	// outside the kubelets.
	GetZoneByProviderID(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 down
	// outside the kubelets.
	GetZoneByNodeName(nodeName types.NodeName) (Zone, error)
}

Zones is an abstract, pluggable interface for zone enumeration.