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Istio MultiCluster Demo

This repository stands up the fastest and easiest demo in a local docker/kind environment to manage a local kind cluster for an Istio Multi-Cluster deployment.

This enables you to experiment with the capabilities such as fault tolerance, locality-aware routing, and gateway routing with ingress gateways, eastwest gateways, and egress gateways.

The deployment structure for this configuration is in line with the most often used production configuration, multi-primary istiod deployments, connected via gateway external services, rather than direct pod communication.

Dependencies

  • kind
  • istioctl - >=1.20
  • jq
  • docker-compose

Helpful Tools

For running on mac, its useful to debug metallb services on Docker Desktop using docker-mac-net-connect.

I also installed the vault CLI locally to test the issuer.

Getting Started

Clone this repository and run ./kind-demo.sh

You should have a working demo up in less than 5 minutes.

To verify, go to the sleep pod in one of the clusters and run:

istioctl pc endpoints -n sample \
  $(kubectl get pod -n sample -l app=sleep -o jsonpath='{.items[0].metadata.name}') |\
  grep helloworld

If your output contains three entries, with one of them on port 15443 the multi-cluster mesh with two clusters (istio-so1 and istio-so2) on separate networks participating in the same mesh have been provisioned correctly.

Debugging

Check that the services in the istio-system are in a healthy state and that metallb has provisioned the IPs successfully.

When You Are Done

Clean up after yourself with ./teardown.sh

Future Goals

This deployment could also be modified to support ambient multi-cluster.

Configs

apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: helloworld
  namespace: sample
spec:
  host: helloworld.sample.svc.cluster.local
  trafficPolicy:
    connectionPool:
      http:
        maxRequestsPerConnection: 1
    loadBalancer:
      simple: ROUND_ROBIN
      localityLbSetting:
        enabled: true
        failoverPriority:
          - "topology.istio.io/network"
          - "topology.kubernetes.io/region"
          - "topology.kubernetes.io/zone"
          - "kubernetes.io/hostname"
    outlierDetection:
      consecutive5xxErrors: 1
      interval: 1s
      baseEjectionTime: 1m