Istio is a great service mesh tool and lets you connect, secure, control, and observe services.
Here I implemented a Canary Deployment, which means, the traffic will be splitting in versions.
Here we have 3 versions of the same API, written in Java with Spring Boot, and we have a little difference between each.
The traffic will be splitting by 50%, 30%, and 20%.
So, lets see the code.
First
Create a Kubernetes cluster, for this example I'll use GKE (Google Kubernetes Engine).
Steps:
gcloud container clusters create CLUSTER-NAME --zone ZONE --num-nodes=3Obs.: You can create on the UI.
gcloud container clusters get-credentials CLUSTER-NAME --zone ZONE --project PROJECT-ID
Second
Wait until the first step is done, then install and configure Istio
Steps:
curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.6.1 sh -
cd istio-1.6.1
export PATH=$PWD/bin:$PATH
istioctl manifest apply --set profile=demo
kubectl label namespace default istio-injection=enabled
*Now it's possible to open kiali on the webbrowser, where you can see the traffic, etc.
istioctl dashboard kiali
*Note: You can install followed the official doc: https://istio.io/latest/docs/setup/getting-started/
Third
Now go to your terminal and create all the deployments, services, and Istio rules.
Steps:
cd kubernetes
kubectl create -f books-deployment-v1.yml
kubectl create -f books-deployment-v2.yml
kubectl create -f books-deployment-v3.yml
kubectl create -f books-svc.yml
cd ..
cd istio
kubectl create -f gateway.yml
kubectl create -f destination-rule.yml
kubectl create -f vs-books.yml
On the browser you can see something like this:
Enjoy it :D