userspace

Documentation

Index

• Variables
• func CleanupLeftovers(ipt iptables.Interface) (encounteredError bool)
• func IsProxyLocked(err error) bool
• type LoadBalancer
• type LoadBalancerRR
  • func NewLoadBalancerRR() *LoadBalancerRR
  • func (lb *LoadBalancerRR) CleanupStaleStickySessions(svcPort proxy.ServicePortName)
  • func (lb *LoadBalancerRR) NewService(svcPort proxy.ServicePortName, affinityType api.ServiceAffinity, ...) error
  • func (lb *LoadBalancerRR) NextEndpoint(svcPort proxy.ServicePortName, srcAddr net.Addr) (string, error)
  • func (lb *LoadBalancerRR) OnEndpointsUpdate(allEndpoints []api.Endpoints)
• type PortAllocator
• type Proxier
  • func NewProxier(loadBalancer LoadBalancer, listenIP net.IP, iptables iptables.Interface, ...) (*Proxier, error)
  • func (proxier *Proxier) OnServiceUpdate(services []api.Service)
  • func (proxier *Proxier) Sync()
  • func (proxier *Proxier) SyncLoop()

Variables

var (
	ErrMissingServiceEntry = errors.New("missing service entry")
	ErrMissingEndpoints    = errors.New("missing endpoints")
)

var (
	// ErrProxyOnLocalhost is returned by NewProxier if the user requests a proxier on
	// the loopback address. May be checked for by callers of NewProxier to know whether
	// the caller provided invalid input.
	ErrProxyOnLocalhost = fmt.Errorf("cannot proxy on localhost")
)

Functions

func CleanupLeftovers

func CleanupLeftovers(ipt iptables.Interface) (encounteredError bool)

CleanupLeftovers removes all iptables rules and chains created by the Proxier It returns true if an error was encountered. Errors are logged.

func IsProxyLocked

func IsProxyLocked(err error) bool

IsProxyLocked returns true if the proxy could not acquire the lock on iptables.

Types

type LoadBalancer

type LoadBalancer interface {
	// NextEndpoint returns the endpoint to handle a request for the given
	// service-port and source address.
	NextEndpoint(service proxy.ServicePortName, srcAddr net.Addr) (string, error)
	NewService(service proxy.ServicePortName, sessionAffinityType api.ServiceAffinity, stickyMaxAgeMinutes int) error
	CleanupStaleStickySessions(service proxy.ServicePortName)
}

LoadBalancer is an interface for distributing incoming requests to service endpoints.

type LoadBalancerRR

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

LoadBalancerRR is a round-robin load balancer.

func NewLoadBalancerRR

func NewLoadBalancerRR() *LoadBalancerRR

NewLoadBalancerRR returns a new LoadBalancerRR.

func (*LoadBalancerRR) CleanupStaleStickySessions

func (lb *LoadBalancerRR) CleanupStaleStickySessions(svcPort proxy.ServicePortName)

func (*LoadBalancerRR) NewService

func (lb *LoadBalancerRR) NewService(svcPort proxy.ServicePortName, affinityType api.ServiceAffinity, ttlMinutes int) error

func (*LoadBalancerRR) NextEndpoint

func (lb *LoadBalancerRR) NextEndpoint(svcPort proxy.ServicePortName, srcAddr net.Addr) (string, error)

NextEndpoint returns a service endpoint. The service endpoint is chosen using the round-robin algorithm.

func (*LoadBalancerRR) OnEndpointsUpdate

func (lb *LoadBalancerRR) OnEndpointsUpdate(allEndpoints []api.Endpoints)

OnEndpointsUpdate manages the registered service endpoints. Registered endpoints are updated if found in the update set or unregistered if missing from the update set.

type PortAllocator

type PortAllocator interface {
	AllocateNext() (int, error)
	Release(int)
}

type Proxier

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

Proxier is a simple proxy for TCP connections between a localhost:lport and services that provide the actual implementations.

func NewProxier

func NewProxier(loadBalancer LoadBalancer, listenIP net.IP, iptables iptables.Interface, pr util.PortRange, syncPeriod time.Duration) (*Proxier, error)

NewProxier returns a new Proxier given a LoadBalancer and an address on which to listen. Because of the iptables logic, It is assumed that there is only a single Proxier active on a machine. An error will be returned if the proxier cannot be started due to an invalid ListenIP (loopback) or if iptables fails to update or acquire the initial lock. Once a proxier is created, it will keep iptables up to date in the background and will not terminate if a particular iptables call fails.

func (*Proxier) OnServiceUpdate

func (proxier *Proxier) OnServiceUpdate(services []api.Service)

OnServiceUpdate manages the active set of service proxies. Active service proxies are reinitialized if found in the update set or shutdown if missing from the update set.

func (*Proxier) Sync

func (proxier *Proxier) Sync()

Sync is called to immediately synchronize the proxier state to iptables

func (*Proxier) SyncLoop

func (proxier *Proxier) SyncLoop()

SyncLoop runs periodic work. This is expected to run as a goroutine or as the main loop of the app. It does not return.