serverless-canary-deployment.md

Serverless Canary Deployment

This is step by step instruction for demonstrating Canary Deployment with knative. Application in this demo is using my custom apps on Quay, consume Kafka Topik and stream to REST API.

Prerequisite

• Install OpenShift Serveless or knative using operator
• Install knative (kn) CLI

Step 0: Login to Openshift CLI and choose designated namespace

$ oc login

$ oc project my-project

Step 1: Deploy knative apps

$ kn service create quarkus-kafka-consumer \
--image quay.io/efeluzy/quarkus-kafka-consumer:v3 \
--revision-name quarkus-kafka-consumer-v3 \

Step 2: Revise knative apps v4 and distribute 50% traffic

kn service update quarkus-kafka-consumer \
--image quay.io/efeluzy/quarkus-kafka-consumer:latest \
--revision-name quarkus-kafka-consumer-v4
--traffic quarkus-kafka-consumer-v4=50 \
--traffic quarkus-kafka-consumer-v3=50 \

Step 3: Distribute service traffic

Using knative CLI

$ kn revision list

choose revision

$ kn service update quarkus-kafka-consumer --traffic quarkus-kafka-consumer-abcd=10 --traffic quarkus-kafka-consumer-vwxyz=90

or using Openshift web console:

Note:

• quarkus-kafka-consumer-vwxyz is previous service revision tag name.
• new service will serve 10%, previous service will serve 90%

Result on Openshift Console

Step 4: Check service status

$ kn service describe quarkus-kafka-consumer

Result

Name:         quarkus-kafka-consumer
Namespace:    erfin-serverless-demo
Labels:       app.kubernetes.io/component=quarkus-kafka-consumer, app.kubernetes.io/instance=quarkus-k ...
Annotations:  openshift.io/generated-by=OpenShiftWebConsole
Age:          7h
URL:          http://quarkus-kafka-consumer-erfin-serverless-demo.apps.erfin-cluster.sandbox1459.opentlc.com

Revisions:
   50%  quarkus-kafka-consumer-tmjzr-3 (current @latest) #v3 [3] (12m)
        Image:  quay.io/efeluzy/quarkus-kafka-consumer:latest (at 09d28f)
   50%  quarkus-kafka-consumer-mjmr9 #latest [1] (7h)
        Image:  image-registry.openshift-image-registry.svc:5000/erfin-serverless-demo/quarkus-kafka-consumer:v3 (at 09d28f)

Conditions:
  OK TYPE                   AGE REASON
  ++ Ready                  10m
  ++ ConfigurationsReady    12m
  ++ RoutesReady            10m