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multicluster

README.md

Multicluster Samples

The samples in this directory help to support multicluster use cases for the following configurations:

  • Primary-Remote
  • Multinetwork

All of these instructions here assume that Istio has already been deployed to your primary clusters.

Creating East-West Gateway

All configurations rely on a separate gateway deployment that is dedicated to east-west traffic. This is done to avoid having east-west traffic flooding the default north-south ingress gateway.

Run the following command to deploy the east-west gateway to a primary cluster:

export MESH=mesh1
export CLUSTER=cluster1
export NETWORK=network1
./samples/multicluster/gen-eastwest-gateway.sh | \
    istioctl manifest generate -f - | \
    kubectl apply -f -

The CLUSTER and NETWORK environment variables should match the values used to deploy the control plane in that cluster.

Primary-Remote Configuration

In order to give a remote cluster access to the control plane (istiod) in a primary cluster, we need to expose the istiod service through the east-west gateway:

kubectl apply -f samples/multicluster/expose-istiod.yaml -n istio-system

Multi-network Configuration

In order to enable cross-cluster load balancing between clusters that are in different networks, we need to expose the services through the east-west gateway in each cluster:

kubectl apply -f samples/multicluster/expose-services.yaml -n istio-system