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Standalone approuter on SAP BTP, Kyma runtime

Overview

SAP BTP, Kyma runtime is used to develop applications and extensions.

This also brings in the following requirements:

  • Serve static content
  • Authenticate and authorize users
  • Forward to the appropriate identity provider for login
  • Rewrite URLs
  • Dispatch requests to other microservices while propagating user information

All these and more capabilities are provided by SAP Application Router.

There are two options to use the Application Router capabilities in SAP BTP, Kyma runtime.

  • Managed Application Router
  • Standalone Application Router deployed on SAP BTP, Kyma runtime.

You can learn about both options in this blog

In this sample, we will deploy a Standalone Application Router deployed on SAP BTP, Kyma runtime.

Scenario

We will deploy an approuter, expose it over the internet via APIRule. It will be exposing a backend API via its configured destinations and routes.

As a simple backend, we will use an HttpBin application that returns the request headers as a response. Good for understanding flows and troubleshooting.

scenario

Note: Standalone approuter is deployed with 2 replicas. Session stickiness is achieved by configuring the Destination rule

Prerequisites

Steps

  • Export environment variables
export NS={your-namespace}
  • Create the namespace and enable istio-injection if not already done.
kubectl create namespace ${NS}
kubectl label namespaces ${NS} istio-injection=enabled
  • Deploy the backend service
kubectl -n ${NS} apply -f k8s/httpbin.yaml
kubectl -n ${NS} apply -f k8s/xsuaa-service-instance.yaml
  • Create the destinations and routes configurations for the approuter
kubectl -n ${NS} apply -f k8s/config.yaml
  • Deploy the approuter
kubectl -n ${NS} apply -f k8s/deployment.yaml
  • Expose the approuter via APIRule.
kubectl -n ${NS} apply -f k8s/api-rule.yaml

Accessing the Application

The approuter is exposed at https://my-approuter.{CLUSTER_DOMAIN}. Access the URL https://my-approuter.{CLUSTER_DOMAIN}/sap/com/httpbin/headers to get all the request headers