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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 (For ISTIO multi-cluster communication usage of SNI ports is mandatory at both ends on istio-ingressgateway)
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NOTE - Although the service running in external cluster can be accessed by following the steps above, the failover mechanism is not yet supported by ISTIO. (Replicated control plane).
For this scneario, the intent must have the following istio configurations
1. In cluster 01
a. serviceEntry - of service serverservice04 as shown in step 4
b. virtualservice - having entries of serverservice04 (in cluster 02), serverservice01 (cluster 01) and serverservice02 (cluster 01) as shown in step 5
c. configmap - to add stubdomain .global in the coreDNS
d. destinationRule - for any restrictions/loadbalancing amongst internal services/hosts
2. In cluster 02
a. configmap - to add stubdomain .global in the coreDNS
b. destinationRule - for any restrictions/loadbalancing amongst internal services/hosts
IN PROGRESS......