kubernetes – k8s.io/kubernetes/pkg/registry/core/service/ipallocator Index | Files | Directories

package ipallocator

import "k8s.io/kubernetes/pkg/registry/core/service/ipallocator"

Index

Constants 

const ControllerName = "ipallocator.k8s.io"

Variables 

var (
	ErrFull              = errors.New("range is full")
	ErrAllocated         = errors.New("provided IP is already allocated")
	ErrMismatchedNetwork = errors.New("the provided network does not match the current range")
	ErrNotReady          = errors.New("allocator not ready")
)

Types

type Allocator 

type Allocator struct {
	// contains filtered or unexported fields
}

Allocator implements current ipallocator interface using IPAddress API object and an informer as backend.

func NewIPAllocator 

func NewIPAllocator(
	cidr *net.IPNet,
	client networkingv1client.NetworkingV1Interface,
	ipAddressInformer networkingv1informers.IPAddressInformer,
) (*Allocator, error)

NewIPAllocator returns an IP allocator associated to a network range that use the IPAddress objectto track the assigned IP addresses, using an informer cache as storage.

func (*Allocator) Allocate 

func (a *Allocator) Allocate(ip net.IP) error

Allocate attempts to reserve the provided IP. ErrNotInRange or ErrAllocated will be returned if the IP is not valid for this range or has already been reserved. ErrFull will be returned if there are no addresses left. Only for testing, it will fail to create the IPAddress object because the Service reference is required.

func (*Allocator) AllocateNext 

func (a *Allocator) AllocateNext() (net.IP, error)

AllocateNext return an IP address that wasn't allocated yet. Only for testing, it will fail to create the IPAddress object because the Service reference is required.

func (*Allocator) AllocateNextService 

func (a *Allocator) AllocateNextService(svc *api.Service) (net.IP, error)

AllocateNext return an IP address that wasn't allocated yet.

func (*Allocator) AllocateService 

func (a *Allocator) AllocateService(svc *api.Service, ip net.IP) error

AllocateService attempts to reserve the provided IP. ErrNotInRange or ErrAllocated will be returned if the IP is not valid for this range or has already been reserved. ErrFull will be returned if there are no addresses left.

func (*Allocator) CIDR 

func (a *Allocator) CIDR() net.IPNet

func (*Allocator) Destroy 

func (a *Allocator) Destroy()

Destroy

func (*Allocator) DryRun 

func (a *Allocator) DryRun() Interface

DryRun

func (*Allocator) EnableMetrics 

func (a *Allocator) EnableMetrics()

EnableMetrics

func (*Allocator) ForEach 

func (a *Allocator) ForEach(f func(net.IP))

ForEach executes the function on each allocated IP This is required to satisfy the Allocator Interface only

func (*Allocator) Free 

func (a *Allocator) Free() int

for testing, it assumes this is the allocator is unique for the ipFamily

func (*Allocator) Has 

func (a *Allocator) Has(ip net.IP) bool

for testing

func (*Allocator) IPFamily 

func (a *Allocator) IPFamily() api.IPFamily

func (*Allocator) Release 

func (a *Allocator) Release(ip net.IP) error

Release releases the IP back to the pool. Releasing an unallocated IP or an IP out of the range is a no-op and returns no error.

func (*Allocator) Used 

func (a *Allocator) Used() int

for testing, it assumes this is the allocator is unique for the ipFamily

type ErrNotInRange 

type ErrNotInRange struct {
	IP         net.IP
	ValidRange string
}

func (*ErrNotInRange) Error 

func (e *ErrNotInRange) Error() string

type Interface 

type Interface interface {
	Allocate(net.IP) error
	AllocateNext() (net.IP, error)
	Release(net.IP) error
	ForEach(func(net.IP))
	CIDR() net.IPNet
	IPFamily() api.IPFamily
	Has(ip net.IP) bool
	Destroy()
	EnableMetrics()

	// DryRun offers a way to try operations without persisting them.
	DryRun() Interface
}

Interface manages the allocation of IP addresses out of a range. Interface should be threadsafe.

type MetaAllocator 

type MetaAllocator struct {
	// contains filtered or unexported fields
}

MetaAllocator implements current allocator interface using ServiceCIDR and IPAddress API objects.

func NewMetaAllocator 

func NewMetaAllocator(
	client networkingv1client.NetworkingV1Interface,
	serviceCIDRInformer networkingv1informers.ServiceCIDRInformer,
	ipAddressInformer networkingv1informers.IPAddressInformer,
	isIPv6 bool,
	bitmapAllocator Interface,
) (*MetaAllocator, error)

NewMetaAllocator returns an IP allocator that use the IPAddress and ServiceCIDR objects to track the assigned IP addresses, using an informer cache as storage.

func (*MetaAllocator) Allocate 

func (c *MetaAllocator) Allocate(ip net.IP) error

Allocate attempts to reserve the provided IP. ErrNotInRange or ErrAllocated will be returned if the IP is not valid for this range or has already been reserved. ErrFull will be returned if there are no addresses left. Only for testing, it will fail to create the IPAddress object because the Service reference is required.s

func (*MetaAllocator) AllocateNext 

func (c *MetaAllocator) AllocateNext() (net.IP, error)

AllocateNext return an IP address that wasn't allocated yet. Only for testing, it will fail to create the IPAddress object because the Service reference is required

func (*MetaAllocator) AllocateNextService 

func (c *MetaAllocator) AllocateNextService(service *api.Service) (net.IP, error)

func (*MetaAllocator) AllocateService 

func (c *MetaAllocator) AllocateService(service *api.Service, ip net.IP) error

func (*MetaAllocator) CIDR 

func (c *MetaAllocator) CIDR() net.IPNet

func (*MetaAllocator) Destroy 

func (c *MetaAllocator) Destroy()

func (*MetaAllocator) DryRun 

func (c *MetaAllocator) DryRun() Interface

DryRun returns a random allocator

func (*MetaAllocator) EnableMetrics 

func (c *MetaAllocator) EnableMetrics()

func (*MetaAllocator) ForEach 

func (c *MetaAllocator) ForEach(f func(ip net.IP))

func (*MetaAllocator) Free 

func (c *MetaAllocator) Free() int

for testing

func (*MetaAllocator) Has 

func (c *MetaAllocator) Has(ip net.IP) bool

func (*MetaAllocator) IPFamily 

func (c *MetaAllocator) IPFamily() api.IPFamily

func (*MetaAllocator) Release 

func (c *MetaAllocator) Release(ip net.IP) error

func (*MetaAllocator) Used 

func (c *MetaAllocator) Used() int

for testing

type Range 

type Range struct {
	// contains filtered or unexported fields
}

Range is a contiguous block of IPs that can be allocated atomically.

The internal structure of the range is: 

For CIDR 10.0.0.0/24
254 addresses usable out of 256 total (minus base and broadcast IPs)
  The number of usable addresses is r.max

CIDR base IP          CIDR broadcast IP
10.0.0.0                     10.0.0.255
|                                     |
0 1 2 3 4 5 ...         ... 253 254 255
  |                              |
r.base                     r.base + r.max
  |                              |
offset #0 of r.allocated   last offset of r.allocated

func New 

func New(cidr *net.IPNet, allocatorFactory allocator.AllocatorWithOffsetFactory) (*Range, error)

New creates a Range over a net.IPNet, calling allocatorFactory to construct the backing store.

func NewFromSnapshot 

func NewFromSnapshot(snap *api.RangeAllocation) (*Range, error)

NewFromSnapshot allocates a Range and initializes it from a snapshot.

func NewInMemory 

func NewInMemory(cidr *net.IPNet) (*Range, error)

NewInMemory creates an in-memory allocator.

func (*Range) Allocate 

func (r *Range) Allocate(ip net.IP) error

Allocate attempts to reserve the provided IP. ErrNotInRange or ErrAllocated will be returned if the IP is not valid for this range or has already been reserved. ErrFull will be returned if there are no addresses left.

func (*Range) AllocateNext 

func (r *Range) AllocateNext() (net.IP, error)

AllocateNext reserves one of the IPs from the pool. ErrFull may be returned if there are no addresses left.

func (*Range) CIDR 

func (r *Range) CIDR() net.IPNet

CIDR returns the CIDR covered by the range.

func (*Range) Destroy 

func (r *Range) Destroy()

Destroy shuts down internal allocator.

func (*Range) DryRun 

func (r *Range) DryRun() Interface

DryRun returns a non-persisting form of this Range.

func (*Range) EnableMetrics 

func (r *Range) EnableMetrics()

EnableMetrics enables metrics recording.

func (*Range) ForEach 

func (r *Range) ForEach(fn func(net.IP))

ForEach calls the provided function for each allocated IP.

func (*Range) Free 

func (r *Range) Free() int

Free returns the count of IP addresses left in the range.

func (*Range) Has 

func (r *Range) Has(ip net.IP) bool

Has returns true if the provided IP is already allocated and a call to Allocate(ip) would fail with ErrAllocated.

func (*Range) IPFamily 

func (r *Range) IPFamily() api.IPFamily

IPFamily returns the IP family of this range.

func (*Range) Release 

func (r *Range) Release(ip net.IP) error

Release releases the IP back to the pool. Releasing an unallocated IP or an IP out of the range is a no-op and returns no error.

func (*Range) Restore 

func (r *Range) Restore(net *net.IPNet, data []byte) error

Restore restores the pool to the previously captured state. ErrMismatchedNetwork is returned if the provided IPNet range doesn't exactly match the previous range.

func (*Range) Snapshot 

func (r *Range) Snapshot(dst *api.RangeAllocation) error

Snapshot saves the current state of the pool.

func (*Range) Used 

func (r *Range) Used() int

Used returns the count of IP addresses used in the range.

Source Files

bitmap.go cidrallocator.go interfaces.go ipallocator.go metrics.go

Directories

PathSynopsis
pkg/registry/core/service/ipallocator/controller
pkg/registry/core/service/ipallocator/storage
Version
v1.33.1 (latest)
Published
May 15, 2025
Platform
linux/amd64
Imports
34 packages
Last checked
12 hours ago –

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