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Progressive Delivery

Progressive delivery demo using canary deployments with Kubernetes and Argo Rollouts

Pre-requisites

Set up

Everything is configured through Make to keep it simple. Just follow these steps.

1. Verify dependencies

This will check for all required and optional dependencies

$ make verify-prereqs

You can continue with the next step once you have all required dependencies.

2. Create cluster

The below command will create a Kind cluster named argo-rollouts-demo and will install the Argo Controller and CRDs, Prometheus, Istio and Kiali.

$ make cluster-up

3. Build sample service images

This command will create a few image tags for our test service

$ make build-images

3. Load images to your cluster

Before being able to use images in a Kind cluster, you need to load them first. The below command will take care of that.

$ make load-images

4. Deploy first version

Run the below command to deploy the green tag version of the service. Since this is the initial deployment, steps/analysis will be skipped and the deployment will become stable as soon as the pods are healthy.

$ make helm-upgrade

5. Open the demo app

Open http://localhost:8080/ in your browser to see the demo app. All squares should report back as green

6. Deploy a canary version

You can use the below command to deploy a canary version. Valid VERSION values are green, blue, yellow and pruple. Version yellow simulates a 50% error rate which would fail the error-rate analysis.

$ make helm-upgrade VERSION=blue

You can watch the rollout using the below command (requires the Argo Kubectl plugin),

$ make watch

Other helpful make commands

$ make helm-uninstall # removes the rollout in case you want to deploy from scracth
$ make delete-cluster # deletes the cluster creating during cluster-up

Open Kiali

If you want to open the Kiali Web App run the below command (this will block the shell),

$ kubectl port-forward svc/kiali 20001:20001 -n istio-system

Now you can open Kiali in your browser at http://localhost:20001/

Open Prometheus

If you want to access the Prometheus UI run the below command (this will block the shell),

$ kubectl port-forward service/prometheus-server 9090:80 -n prometheus

Now you can open Prometheus in your browser at http://localhost:9090/