Table of Contents

Scenario 01 - Considering microservice replication across multiple locations with replication within each cluster

Diagram

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Testing Steps

1. Install ISTIO - Deploy istio control plane in each cluster. (NOTE - For testing use common root CA).  Reference
2. Deploy the application is both the clusters as shown in the above figure. (NOTE - Make sure that the istio sidecars are injected to the Service pods)  For example use - server- httpbin, client - sleep
3. 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

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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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#!/bin/bash
COUNTER=0
while [ $COUNTER -lt 10 ]; do
	curl -v service01.bar.svc.cluster.local/headers
	sleep 2
done

NOTE - Although the service running in an external cluster can be accessed by following the steps above, the failover mechanism is not yet supported by ISTIO

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(Replicated control plane).

For this scenario, the intent must have the following istio configurations

IN PROGRESS......