Ambassador Edge Stack quick start

1. Installation

We'll start by installing Ambassador Edge Stack into your cluster.

We recommend using Helm but there are other options below to choose from.

# Add the Repo:
helm repo add datawire https://app.getambassador.io
helm repo update
 
# Create Namespace and Install:
kubectl create namespace ambassador && \
helm install --devel edge-stack --namespace ambassador datawire/edge-stack && \
kubectl -n ambassador wait --for condition=available --timeout=90s deploy -lproduct=aes

2. Routing traffic from the edge

Ambassador Edge Stack uses Kubernetes Custom Resource Definitions (CRDs) to declaratively define its desired state. The workflow you are going to build uses a simple demo app, a Listener CRD, and a Mapping CRD. The Listener CRD tells Ambassador Edge Stack what port to listen on, and the Mapping CRD tells Ambassador Edge Stack how to route incoming requests by host and URL path from the edge of your cluster to Kubernetes services.

1. Start by creating a Listener resource for HTTP on port 8080:

kubectl apply -f - <<EOF
---
apiVersion: getambassador.io/v3alpha1
kind: Listener
metadata:
  name: edge-stack-listener-8080
  namespace: ambassador
spec:
  port: 8080
  protocol: HTTP
  securityModel: XFP
  hostBinding:
    namespace:
      from: ALL
---
apiVersion: getambassador.io/v3alpha1
kind: Listener
metadata:
  name: edge-stack-listener-8443
  namespace: ambassador
spec:
  port: 8443
  protocol: HTTPS
  securityModel: XFP
  hostBinding:
    namespace:
      from: ALL
EOF

2. Apply the YAML for the “Quote of the Moment" service.

   shell

   copied

   kubectl apply -f https://app.getambassador.io/yaml/v2-docs/latest/quickstart/qotm.yaml
   
   

   The Service and Deployment are created in your default namespace. You can use kubectl get services,deployments quote to see their status.

3. Copy the configuration below and save it to a file called quote-backend.yaml so that you can create a Mapping on your cluster. This Mapping tells Ambassador Edge Stack to route all traffic inbound to the /backend/ path to the quote Service.

   yaml

   copied

   ---
   apiVersion: getambassador.io/v3alpha1
   kind: Mapping
   metadata:
     name: quote-backend
   spec:
     hostname: "*"
     prefix: /backend/
     service: quote
   
   

4. Apply the configuration to the cluster:

   shell

   copied

   kubectl apply -f quote-backend.yaml
   
   

   With our Mapping created, now we need to access it!

5. Store the Ambassador Edge Stack load balancer IP address to a local environment variable. You will use this variable to test access to your service.

   shell

   copied

   export LB_ENDPOINT=$(kubectl -n ambassador get svc  edge-stack \
     -o "go-template={{range .status.loadBalancer.ingress}}{{or .ip .hostname}}{{end}}")
   
   

6. Test the configuration by accessing the service through the Ambassador Edge Stack load balancer:

   Terminal

   copied
   $ curl -Lki https://$LB_ENDPOINT/backend/
     HTTP/1.1 200 OK
     content-type: application/json
     date: Wed, 23 Jun 2021 16:49:46 GMT
     content-length: 163
     x-envoy-upstream-service-time: 0
     server: envoy
     {
         "server": "serene-grapefruit-gjd4yodo",
         "quote": "The last sentence you read is often sensible nonsense.",
         "time": "2021-06-23T16:49:46.613322198Z"
     }
   

What's next?

Explore some of the popular tutorials on Ambassador Edge Stack:

• Intro to Mappings: declaratively routes traffic from the edge of your cluster to a Kubernetes service
• Host resource: configure a hostname and TLS options for your ingress.
• Rate Limiting: create policies to control sustained traffic loads

Ambassador Edge Stack has a comprehensive range of features to support the requirements of any edge microservice.

To learn more about how Ambassador Edge Stack works, read the Ambassador Edge Stack Story.