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1. Install ISTIO - Deploy istio control plane in each cluster. (NOTE - For testing use common root CA)
2. Configure DNS - To provide resolution of service from remote clusters, istio uses its own DNS called istiocoredns which provides the resolution of remote istio services

   1. Eg:

      
      

NOTE - In order to utilize istiocoredns, Kubernetes DNS' must be configured to stub a domain in a specific format

3. Use configMap to add a stub domain to the Kubernetes's DNS.

kind: ConfigMap
data:
  Corefile: |
    .:53 {
        errors
        health
        kubernetes cluster.local in-addr.arpa ip6.arpa {
           pods insecure
           upstream
           fallthrough in-addr.arpa ip6.arpa
        }
        prometheus :9153
        proxy . /etc/resolv.conf
        cache 30
        loop
        reload
        loadbalance
    }
    global:53 {
        errors
        cache 30
        proxy . 10.43.57.78
    }

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NOTE - In order to utilize istiocoredns, Kubernetes DNS' must be configured to stub a domain in a specific format

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4. Add Istio service entry with details of the remote servers  (server service 03 and server service 04) to the cluster where the client is running

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