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Published: Jun 18, 2015 License: Apache-2.0 Imports: 17 Imported by: 0



Package proxy implements the layer-3 network proxy.



This section is empty.


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


func IsProxyLocked added in v0.5.2

func IsProxyLocked(err error) bool

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


type LoadBalancer

type LoadBalancer interface {
	// NextEndpoint returns the endpoint to handle a request for the given
	// service-port and source address.
	NextEndpoint(service ServicePortName, srcAddr net.Addr) (string, error)
	NewService(service ServicePortName, sessionAffinityType api.ServiceAffinity, stickyMaxAgeMinutes int) error
	CleanupStaleStickySessions(service 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 added in v0.2.1

func (lb *LoadBalancerRR) CleanupStaleStickySessions(svcPort ServicePortName)

func (*LoadBalancerRR) NewService added in v0.2.1

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

func (*LoadBalancerRR) NextEndpoint

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

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

func (*LoadBalancerRR) OnUpdate

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

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

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) (*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) OnUpdate

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

OnUpdate 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) 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.

type ServicePortName added in v0.4.4

type ServicePortName struct {
	Port string

ServicePortName carries a namespace + name + portname. This is the unique identfier for a load-balanced service.

func (ServicePortName) String added in v0.4.4

func (spn ServicePortName) String() string


Path Synopsis
Package config provides decoupling between various configuration sources (etcd, files,...) and the pieces that actually care about them (loadbalancer, proxy).
Package config provides decoupling between various configuration sources (etcd, files,...) and the pieces that actually care about them (loadbalancer, proxy).

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