Example blue green deployment using Istio

In this example, I use NodePort for IstioGateway so in somecase, you shoud change NodePort to LoadBalancer.
Install Istio:

• Create Custom Resource Definition (CDR) for kubernetes: kubectl apply -f crds.yml
• Create istio-system namespace: kubectl create namespace istio-system
• Create Kiali secrets: kubectl apply -f kia-secrets.yml, username and password are encoded in base64, both username and password is admin
• Install istio within kubernetes: kubectl apply -f istio.yml

Install app deployment and service

• Create blue-green namespace: kubectl apply -f namespace.yml
• Blue deployment: kubectl apply -f blue/deployment.yml
• Green deployment: kubectl apply -f green/deployment.yml
• App service: kubectl apply -f service.yml

Configure blue green deployment:

• Install app gateway:kubectl apply -f app-gateway.yml
• Create destination rule: kubectl apply -f des-rule.yml
• Install virtual service: kubectl apply -f virtual-service.yml, host field in virtual services is service name

Access Kiali dashboard: Using portfoward forward traffice to localhost

kubectl -n istio-system port-forward $(kubectl -n istio-system get pod -l app=kiali -o jsonpath='{.items[0].metadata.name}') 20001:20001

access http://localhost:20001/kiali