route

package
Version: v0.9.0 Latest Latest
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Published: Sep 16, 2019 License: Apache-2.0 Imports: 52 Imported by: 0

README

Route CRDs

All routing in Knative Serving is done through the Route CRD, which provides a network endpoint for a user's service/app (which consists of a series of software and configuration Revisions over time). The Route provides a long-lived, stable, named, HTTP-addressable endpoint that is backed by one or more Revisions. The default configuration is for the Route to automatically direct traffic to the latest revision created by a Configuration. For more about Routes, read this doc.

Currently we use Istio to program the network for Routes, but we don't exclude other implementations if they can provide similar functionality.

Underlying implementation using Istio

Shared Gateway for all Knative Routes

Currently all Routes can receive external traffic through a shared Istio Gateway. Many of our users may already be Istio users. In order to avoid conflict with users' Gateway settings, we use a different Gateway than the default istio-ingressgateway. In the future we should probably provide a way for the users to select what the Gateway they use -- and how Knative would expect such Gateway to look like.

For each Route, a VirtualService and Service

A valid Route object, when reconciled by Knative Route controller, will generate the following objects:

  • A VirtualService to realize the routing from the Gateway knative-ingress-gateway to the traffic target referenced in the Route.

  • A Service with the same name as the Route, so that we can access the Route using <route-name>.<route-namespace>.svc.<cluster-domain-name>. This Service has no Pod, we use it solely to have a domain name and a cluster IP to be used in the VirtualService. The value of <cluster-domain-name> depends on a domain name specified during the installation of the cluster. If no custom domain name was specified, then cluster.local should be used as in the following example:

    <route-name>.<route-namespace>.svc.cluster.local

    otherwise cluster's custom domain name should be used:

    <route-name>.<route-namespace>.svc.real-domain-name.com

For example, if we have two Knative Revisions hello-world-01 and hello-world-02, and one Route hello-world that directs traffic to both Revisions, the resources would look like:

Istio resources generated by a Route are shown in the dotted box

Routing in the presence of Inactive Revisions (aka 0→1)

In the case of inactive Revisions, a Route would direct requests through the Service activator-service, with enough information in the headers so that the Service activator-service Service can activate a Revision before relaying the traffic to it.

From the same scenario of the previous example, if the Revision hello-world-01 becomes inactive due to lack of traffic, the resources would look like:

Revision hello-world-01 is deactivated

Note that while we still see a hello-world-01 Service in this case, it does not have any Pod until activated by the activator.

After Revision hello-world-02 also becomes inactive due to lack of traffic, the resources would look like:

Both Revisions are deactivated

If any activation happens, Revisions becomes active again and traffic will be adjusted to route directly to the Revision, without going through the Service activator-service.

Documentation

Overview

Package route implements a kubernetes controller which tracks Route resource and reconcile ClusterIngress as its child resource.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func NewController

func NewController(
	ctx context.Context,
	cmw configmap.Watcher,
) *controller.Impl

NewController initializes the controller and is called by the generated code Registers eventhandlers to enqueue events

func NewControllerWithClock

func NewControllerWithClock(
	ctx context.Context,
	cmw configmap.Watcher,
	clock system.Clock,
) *controller.Impl

Types

type BaseIngressResources added in v0.8.0

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

BaseIngressResources Common base struct for ingress resource

type ClusterIngressResources added in v0.8.0

type ClusterIngressResources struct {
	BaseIngressResources
	// contains filtered or unexported fields
}

ClusterIngressResources Cluster Ingress resources

type IngressResourceAccessors added in v0.8.0

type IngressResourceAccessors interface {
	// contains filtered or unexported methods
}

IngressResourceAccessors Interface for accessing ingress resource

type IngressResources added in v0.8.0

type IngressResources struct {
	BaseIngressResources
	// contains filtered or unexported fields
}

IngressResources Namespaced ingress resources

type Reconciler

type Reconciler struct {
	*reconciler.Base
	// contains filtered or unexported fields
}

Reconciler implements controller.Reconciler for Route resources.

func (*Reconciler) GetCertificateLister added in v0.9.0

func (c *Reconciler) GetCertificateLister() networkinglisters.CertificateLister

GetCertificateLister returns the lister for Knative Certificate.

func (*Reconciler) GetServingClient added in v0.9.0

func (c *Reconciler) GetServingClient() clientset.Interface

GetServingClient returns the client to access Knative serving resources.

func (*Reconciler) Reconcile

func (c *Reconciler) Reconcile(ctx context.Context, key string) error

Reconcile compares the actual state with the desired, and attempts to converge the two. It then updates the Status block of the Route resource with the current status of the resource.

Directories

Path Synopsis
+k8s:deepcopy-gen=package Package config holds the typed objects that define the schemas for assorted ConfigMap objects on which the Route controller depends.
+k8s:deepcopy-gen=package Package config holds the typed objects that define the schemas for assorted ConfigMap objects on which the Route controller depends.
Package domains holds simple functions for generating domains.
Package domains holds simple functions for generating domains.
Package resources holds simple functions for synthesizing child resources from a Route resource and any relevant Route controller configuration.
Package resources holds simple functions for synthesizing child resources from a Route resource and any relevant Route controller configuration.
labels
Package labels holds simple functions for working with ObjectMeta labels.
Package labels holds simple functions for working with ObjectMeta labels.
names
Package names holds simple functions for synthesizing resource names.
Package names holds simple functions for synthesizing resource names.

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