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+---
+layout: blog
+title: "Kubernetes v1.26: Advancements in Kubernetes Traffic Engineering"
+date: 2022-11-28
+slug: advancements-in-kubernetes-traffic-engineering
+---
+
+**Authors:** Andrew Sy Kim (Google)
+
+Kubernetes v1.26 includes significant advancements in network traffic engineering with the graduation of
+two features (Service internal traffic policy support, and EndpointSlice terminating conditions) to GA,
+and a third feature (Proxy terminating endpoints) to beta. The combination of these enhancements aims
+to address short-comings in traffic engineering that people face today, and unlock new capabilities for the future.
+
+## Traffic Loss from Load Balancers During Rolling Updates
+
+Prior to Kubernetes v1.26, clusters could experience [loss of traffic](https://github.com/kubernetes/kubernetes/issues/85643)
+from Service load balancers during rolling updates when setting the `externalTrafficPolicy` field to `Local`.
+There are a lot of moving parts at play here so a quick overview of how Kubernetes manages load balancers might help!
+
+In Kubernetes, you can create a Service with `type: LoadBalancer` to expose an application externally with a load balancer.
+The load balancer implementation varies between clusters and platforms, but the Service provides a generic abstraction
+representing the load balancer that is consistent across all Kubernetes installations.
+
+```yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: my-service
+spec:
+  selector:
+    app.kubernetes.io/name: my-app
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 9376
+  type: LoadBalancer
+```
+
+Under the hood, Kubernetes allocates a NodePort for the Service, which is then used by kube-proxy to provide a
+network data path from the NodePort to the Pod. A controller will then add all available Nodes in the cluster
+to the load balancer’s backend pool, using the designated NodePort for the Service as the backend target port.
+
+{{< figure src="traffic-engineering-service-load-balancer.png" caption="Figure 1: Overview of Service load balancers" >}}
+
+Oftentimes it is beneficial to set `externalTrafficPolicy: Local` for Services, to avoid extra hops between
+Nodes that are not running healthy Pods backing that Service. When using `externalTrafficPolicy: Local`,
+an additional NodePort is allocated for health checking purposes, such that Nodes that do not contain healthy
+Pods are excluded from the backend pool for a load balancer.
+
+{{< figure src="traffic-engineering-lb-healthy.png" caption="Figure 2: Load balancer traffic to a healthy Node, when externalTrafficPolicy is Local" >}}
+
+One such scenario where traffic can be lost is when a Node loses all Pods for a Service,
+but the external load balancer has not probed the health check NodePort yet. The likelihood of this situation
+is largely dependent on the health checking interval configured on the load balancer. The larger the interval,
+the more likely this will happen, since the load balancer will continue to send traffic to a node
+even after kube-proxy has removed forwarding rules for that Service. This also occurrs when Pods start terminating
+during rolling updates. Since Kubernetes does not consider terminating Pods as “Ready”, traffic can be loss
+when there are only terminating Pods on any given Node during a rolling update.
+
+{{< figure src="traffic-engineering-lb-without-proxy-terminating-endpoints.png" caption="Figure 3: Load balancer traffic to terminating endpoints, when externalTrafficPolicy is Local" >}}
+
+Starting in Kubernetes v1.26, kube-proxy enables the `ProxyTerminatingEndpoints` feature by default, which
+adds automatic failover and routing to terminating endpoints in scenarios where the traffic would otherwise
+be dropped. More specifically, when there is a rolling update and a Node only contains terminating Pods,
+kube-proxy will route traffic to the terminating Pods based on their readiness. In addition, kube-proxy will
+actively fail the health check NodePort if there are only terminating Pods available. By doing so,
+kube-proxy alerts the external load balancer that new connections should not be sent to that Node but will
+gracefully handle requests for existing connections.
+
+{{< figure src="traffic-engineering-lb-with-proxy-terminating-endpoints.png" caption="Figure 4: Load Balancer traffic to terminating endpoints with ProxyTerminatingEndpoints enabled, when externalTrafficPolicy is Local" >}}
+
+### EndpointSlice Conditions
+
+In order to support this new capability in kube-proxy, the EndpointSlice API introduced new conditions for endpoints:
+`serving` and `terminating`.
+
+{{< figure src="endpointslice-overview.png" caption="Figure 5: Overview of EndpointSlice conditions" >}}
+
+The `serving` condition is semantically identical to `ready`, except that it can be `true` or `false`
+while a Pod is terminating, unlike `ready` which will always be `false` for terminating Pods for compatibility reasons.
+The `terminating` condition is true for Pods undergoing termination (non-empty deletionTimestamp), false otherwise.
+
+The addition of these two conditions enables consumers of this API to understand Pod states that were previously not possible.
+For example, we can now track "ready" and "not ready" Pods that are also terminating.
+
+{{< figure src="endpointslice-with-terminating-pod.png" caption="Figure 6: EndpointSlice conditions with a terminating Pod" >}}
+
+Consumers of the EndpointSlice API, such as Kube-proxy and Ingress Controllers, can now use these conditions to coordinate connection draining
+events, by continuing to forward traffic for existing connections but rerouting new connections to other non-terminating endpoints.
+
+## Optimizing Internal Node-Local Traffic
+
+Similar to how Services can set `externalTrafficPolicy: Local` to avoid extra hops for externally sourced traffic, Kubernetes
+now supports `internalTrafficPolicy: Local`, to enable the same optimization for traffic originating within the cluster, specifically
+for traffic using the Service Cluster IP as the destination address. This feature graduated to Beta in Kubernetes v1.24 and is graduating to GA in v1.26.
+
+Services default the `internalTrafficPolicy` field to `Cluster`, where traffic is randomly distributed to all endpoints.
+
+{{< figure src="service-internal-traffic-policy-cluster.png" caption="Figure 7: Service routing when internalTrafficPolicy is Cluster" >}}
+
+When `internalTrafficPolicy` is set to `Local`, kube-proxy will forward internal traffic for a Service only if there is an available endpoint
+that is local to the same Node.
+
+{{< figure src="service-internal-traffic-policy-local.png" caption="Figure 8: Service routing when internalTrafficPolicy is Local" >}}
+
+{{< caution >}}
+When using `internalTrafficPoliy: Local`, traffic will be dropped by kube-proxy when no local endpoints are available.
+{{< /caution >}}
+
+## Getting Involved
+
+If you're interested in future discussions on Kubernetes traffic engineering, you can get involved in SIG Network through the following ways:
+* Slack: [#sig-network](https://kubernetes.slack.com/messages/sig-network)
+* [Mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-network)
+* [Open Community Issues/PRs](https://github.com/kubernetes/community/labels/sig%2Fnetwork)
+* [Biweekly meetings](https://github.com/kubernetes/community/tree/master/sig-network#meetings)
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