Installing and configuring Istio components on K8s

Here's a step-by-step guide to installing and configuring Istio components, setting up basic routing, and implementing server-side authentication on Kubernetes:

1. Install Istio:
2. Download the latest release of Istio from the official Istio website.
3. Extract the files from the downloaded package.
4. Assuming you have a Kubernetes cluster, install Istio by running the following command:

$ istioctl install --set profile=default

1. Verify Istio installation:
2. Run the following command to ensure all necessary Istio components are running:

$ kubectl get pods -n istio-system

• All the Istio pods should be in a "Running" state.
• Enable automatic sidecar injection:
• Label your Kubernetes namespace to enable automatic sidecar injection by running:

$ kubectl label namespace  istio-injection=enabled

• This label allows Istio to automatically inject sidecar proxies into each pod in the specified namespace.
• Set up basic routing:
• Create a Kubernetes deployment, service, and virtual service for your application.
• Create a deployment.yaml file with the necessary configuration for your application deployment.
• Run the following command to create the deployment:

$ kubectl apply -f deployment.yaml

• Create a service.yaml file with the necessary configuration for your application service.
• Run the following command to create the service:

$ kubectl apply -f service.yaml

• Create a virtualservice.yaml file with the necessary configuration for your virtual service, including the destination rules.
• Run the following command to create the virtual service:

$ kubectl apply -f virtualservice.yaml

• This sets up the routing for your application.
• Implement server-side authentication:
• Generate a server certificate and a private key for your application.
• Create a Kubernetes secret to store the server certificate and private key:

$ kubectl create secret tls  --cert=path/to/certificate.crt --key=path/to/private/key.key

• Update your virtual service configuration to enable server-side authentication and specify the secret:

apiVersion: networking.istio.io/v1alpha3
     kind: VirtualService
     metadata:
       name: 
     spec:
       hosts:
       - 
       gateways:
       - 
       http:
       - match:
         - uri:
             prefix: /
         route:
         - destination:
             host: 
             port:
               number: 
           weight: 100
         tls:
           credentialName: 
           mode: SIMPLE

• Apply the updated virtual service configuration:

$ kubectl apply -f updated-virtualservice.yaml

• This enables server-side authentication for your application.

That's it! You have now installed and configured Istio, set up basic routing, and implemented server-side authentication on Kubernetes. You can now further explore advanced Istio features based on your application requirements.