Multi-cluster

Supported Versions: Istio 1.18+ Last Updated: February 23, 2026 Kubernetes Compatibility: 1.32+

Multi-cluster Service Mesh connects multiple Kubernetes clusters into a unified service mesh.

Do You Really Need Multi-cluster?

Multi-cluster Service Mesh is powerful but increases complexity and cost. Careful consideration is needed before adoption.

Decision Flow

When Multi-cluster is Needed

1. Geographic Distribution and Latency Optimization

When needed:

Global user-facing services (latency goal <100ms)
Data sovereignty compliance (GDPR, financial data localization)
Regional traffic routing and failure isolation

2. Disaster Recovery (DR)

When needed:

RTO (Recovery Time Objective) <1 hour
RPO (Recovery Point Objective) <15 minutes
Automatic Failover on regional failure

3. Environment Separation and Staged Deployment

When needed:

Dev/Staging/Prod cluster separation with unified management
Blue/Green deployments at cluster level
Canary deployments with gradual regional expansion

4. Organizational Boundaries and Security Isolation

When needed:

Independent cluster operation per team/department
Enhanced Multi-tenancy
Physical isolation for regulatory compliance

When Multi-cluster is NOT Needed

1. Single Region, Small Scale Services

Use instead:

Kubernetes Namespace separation
NetworkPolicy for network isolation
RBAC for access control

2. When Operational Complexity Cannot Be Handled

Multi-cluster operational requirements:

Minimum 2-3 Istio experts
East-West Gateway management and monitoring
Cross-cluster certificate management
Cross-cluster debugging capability

If your team is small:

Single-cluster Istio or
AWS VPC Lattice (managed service)

3. When Cost is a Key Consideration

Multi-cluster additional costs:

LoadBalancer for East-West Gateway ($20-50/month per region)
Cross-region data transfer ($0.02/GB)
Control Plane redundancy (2-3x resources)

Checklist

Answer these questions before adoption:

Architecture:

[ ] Are 2 or more clusters already in operation?
[ ] Is multi-region deployment needed?
[ ] Are cross-cluster service calls frequent?

Business Requirements:

[ ] Targeting global users?
[ ] Is Disaster Recovery (DR) essential?
[ ] Are RTO/RPO requirements strict?

Security and Compliance:

[ ] Is data localization needed?
[ ] Is strong cross-cluster isolation needed?

Operational Capability:

[ ] Do you have Istio experts?
[ ] Can you debug complex networking issues?
[ ] Can you afford additional costs?

Results:

9+ checks: Multi-cluster Istio recommended
5-8 checks: Consider VPC Lattice or Hybrid
4 or fewer checks: Start with Single-cluster Istio

Architecture Selection Guide

Optimal Solution by Scenario

Scenario	Single-cluster	Multi-cluster Istio	VPC Lattice	Hybrid
Single region, small scale	Optimal	Overkill	Unnecessary	Unnecessary
Multi-region, strong L7 needed	Not possible	Optimal	Limited	Recommended
AWS-centric, simple connectivity	Limited	Overkill	Optimal	Unnecessary
DR, automatic Failover	Not possible	Optimal	Manual	Recommended
Cost optimization priority	Optimal	Expensive	Recommended	Medium
Operational simplification	Optimal	Complex	Optimal	Medium
Fine-grained traffic control	Possible	Optimal	Limited	Recommended

Comparison of Each Solution

Single-cluster Istio

Pros:

Simplest management
Low cost
Fast debugging
All Istio features available

Cons:

Single point of failure
Complete service outage on regional failure
No geographic distribution possible

Suitable when:

Single region service
Small team (<50 people)
High availability not essential

Multi-cluster Istio

Pros:

Complete geographic distribution
Automatic DR and Failover
All L7 features (Retry, Timeout, Circuit Breaker)
Fine-grained traffic control
Unified observability

Cons:

High operational complexity
East-West Gateway management required
Cross-region data transfer costs
Difficult debugging

Suitable when:

Global services
Strong DR needed
Fine-grained L7 control essential

AWS VPC Lattice

Pros:

AWS fully managed
Simple setup
Low operational burden
Safe cross-VPC connectivity
Cost effective

Cons:

Limited L7 features (no Retry, Circuit Breaker)
AWS lock-in
No fine-grained traffic control
Lacks Istio observability

Suitable when:

AWS-centric architecture
Only simple service connectivity needed
Operational simplification priority

Istio vs AWS VPC Lattice

Feature Comparison

Feature	Istio Multi-cluster	AWS VPC Lattice	Hybrid
Traffic Routing
Header-based routing	Fully supported	Limited	Istio handles
Weighted routing	Supported	Supported	Both possible
Path-based routing	Supported	Supported	Both possible
Resilience
Retry	Fine-grained control	Not supported	Istio handles
Timeout	Fine-grained control	Basic only	Istio handles
Circuit Breaker	Supported	Not supported	Istio handles
Security
mTLS	Automatic	Supported	Both
AuthN/AuthZ	Fine-grained policies	IAM only	Istio handles
Observability
Distributed tracing	Jaeger/Zipkin	Limited	Istio handles
Metrics	Detailed	Basic only	Istio handles
Operations
Management complexity	High	Low	Medium
Cost	High	Low	Medium
AWS integration	Manual	Native	Good

Architecture Pattern Comparison

Pattern 1: Istio Multi-cluster Only

Pros:

Full Istio features
Unified observability
Fine-grained control

Cons:

East-West Gateway management required
High complexity
Cross-region data transfer costs

Pattern 2: VPC Lattice Only

Pros:

AWS fully managed
Simple setup
Low operational burden

Cons:

Cannot use Istio features
Limited traffic control
Not Kubernetes native

Pattern 3: Hybrid (Recommended)

Pros:

Intra-cluster: All advanced Istio features (Retry, Circuit Breaker, fine-grained routing)
Cross-cluster: Simple VPC Lattice management and stability
Reduced operational complexity (no East-West Gateway)
Cost optimization (minimize cross-region traffic)

Cons:

Need to understand two technology stacks
Cross-cluster limited to Lattice features

Suitable when:

AWS environment
Complex traffic control needed intra-cluster
Only simple connectivity needed cross-cluster

Multi-cluster Overview

With Multi-cluster Service Mesh you can:

Multi-region deployment
Disaster Recovery (DR)
Environment separation (dev/staging/prod)
Cross-cluster service discovery and communication

Topology

Primary-Remote

Characteristics:

Single Control Plane (Primary)
Multiple Data Planes (Remote)
Simple management
Single point of failure (Primary)

Multi-Primary

Characteristics:

Multiple Control Planes
High availability
Complex management
Regional autonomy

Primary-Remote Setup

1. Primary Cluster Setup

bash

# Context setup
export CTX_CLUSTER1=cluster1

# Install Istio
istioctl install --context="${CTX_CLUSTER1}" -f - <<EOF
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
spec:
  values:
    global:
      meshID: mesh1
      multiCluster:
        clusterName: cluster1
      network: network1
EOF

# Install East-West Gateway
samples/multicluster/gen-eastwest-gateway.sh \
  --mesh mesh1 --cluster cluster1 --network network1 | \
  istioctl install --context="${CTX_CLUSTER1}" -y -f -

# Expose Gateway
kubectl apply --context="${CTX_CLUSTER1}" -f \
  samples/multicluster/expose-services.yaml

2. Remote Cluster Setup

bash

# Context setup
export CTX_CLUSTER2=cluster2

# Create Remote Secret
istioctl create-remote-secret \
  --context="${CTX_CLUSTER1}" \
  --name=cluster1 | \
  kubectl apply -f - --context="${CTX_CLUSTER2}"

# Install Istio with Remote configuration
istioctl install --context="${CTX_CLUSTER2}" -f - <<EOF
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
spec:
  values:
    global:
      meshID: mesh1
      multiCluster:
        clusterName: cluster2
      network: network1
      remotePilotAddress: ${DISCOVERY_ADDRESS}
EOF

Multi-Primary Setup

1. Set Both Clusters as Primary

bash

# Cluster 1
istioctl install --context="${CTX_CLUSTER1}" -f - <<EOF
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
spec:
  values:
    global:
      meshID: mesh1
      multiCluster:
        clusterName: cluster1
      network: network1
EOF

# Cluster 2
istioctl install --context="${CTX_CLUSTER2}" -f - <<EOF
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
spec:
  values:
    global:
      meshID: mesh1
      multiCluster:
        clusterName: cluster2
      network: network2
EOF

2. Cross-register Remote Secrets

bash

# Cluster 1's Secret to Cluster 2
istioctl create-remote-secret \
  --context="${CTX_CLUSTER1}" \
  --name=cluster1 | \
  kubectl apply -f - --context="${CTX_CLUSTER2}"

# Cluster 2's Secret to Cluster 1
istioctl create-remote-secret \
  --context="${CTX_CLUSTER2}" \
  --name=cluster2 | \
  kubectl apply -f - --context="${CTX_CLUSTER1}"

Cross-cluster Communication

Service Entry

yaml

apiVersion: networking.istio.io/v1
kind: ServiceEntry
metadata:
  name: httpbin-cluster2
spec:
  hosts:
  - httpbin.default.svc.cluster.local
  location: MESH_INTERNAL
  ports:
  - number: 8000
    name: http
    protocol: HTTP
  resolution: DNS
  addresses:
  - 240.0.0.1
  endpoints:
  - address: ${CLUSTER2_INGRESS_HOST}
    ports:
      http: 15443

Using with VPC Lattice

Hybrid Architecture Implementation

You can combine Istio and VPC Lattice to create the best of both.

Step 1: Install Istio Independently in Each Cluster

bash

# Cluster 1 (single cluster mode)
export CTX_CLUSTER1=cluster1
istioctl install --context="${CTX_CLUSTER1}" -f - <<EOF
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
spec:
  values:
    global:
      meshID: mesh1-cluster1
      multiCluster:
        enabled: false  # Disable Multi-cluster
      network: network1
EOF

# Cluster 2 (independent installation)
export CTX_CLUSTER2=cluster2
istioctl install --context="${CTX_CLUSTER2}" -f - <<EOF
apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
spec:
  values:
    global:
      meshID: mesh1-cluster2
      multiCluster:
        enabled: false  # Disable Multi-cluster
      network: network2
EOF

Step 2: Create VPC Lattice Service Network

bash

# Create Service Network
aws vpc-lattice create-service-network \
  --name my-service-network \
  --auth-type AWS_IAM

# Save Service Network ID
SERVICE_NETWORK_ID=$(aws vpc-lattice list-service-networks \
  --query 'items[?name==`my-service-network`].id' \
  --output text)

# Connect VPC (Cluster 1 VPC)
aws vpc-lattice create-service-network-vpc-association \
  --service-network-identifier $SERVICE_NETWORK_ID \
  --vpc-identifier $VPC1_ID

# Connect VPC (Cluster 2 VPC)
aws vpc-lattice create-service-network-vpc-association \
  --service-network-identifier $SERVICE_NETWORK_ID \
  --vpc-identifier $VPC2_ID

Step 3: Register Kubernetes Service to VPC Lattice

yaml

# Register Cluster 1's service to VPC Lattice
apiVersion: application-networking.k8s.aws/v1alpha1
kind: ServiceExport
metadata:
  name: my-service
  namespace: default
  annotations:
    application-networking.k8s.aws/lattice-service-network: my-service-network
spec: {}
---
# Routing from Cluster 1 to VPC Lattice
apiVersion: networking.istio.io/v1
kind: ServiceEntry
metadata:
  name: remote-service-via-lattice
  namespace: default
spec:
  hosts:
  - remote-service.lattice.svc.cluster.local
  location: MESH_EXTERNAL
  ports:
  - number: 80
    name: http
    protocol: HTTP
  resolution: DNS
  endpoints:
  - address: ${LATTICE_SERVICE_DNS}  # VPC Lattice DNS
    ports:
      http: 80
---
# Don't apply mTLS for VPC Lattice traffic
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: remote-service-via-lattice
  namespace: default
spec:
  host: remote-service.lattice.svc.cluster.local
  trafficPolicy:
    tls:
      mode: SIMPLE  # VPC Lattice handles TLS

Step 4: IAM Policy Setup

json

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": "vpc-lattice-svcs:Invoke",
      "Resource": "*",
      "Condition": {
        "StringEquals": {
          "vpc-lattice-svcs:SourceVpc": [
            "${VPC1_ID}",
            "${VPC2_ID}"
          ]
        }
      }
    }
  ]
}

Traffic Flow

Pros and Considerations

Pros:

Intra-cluster: All Istio features (Retry, Circuit Breaker, fine-grained routing)
Cross-cluster: Simple VPC Lattice management
No East-West Gateway needed -> Reduced operational burden
AWS native integration

Considerations:

Cross-cluster traffic limited to VPC Lattice features
VPC Lattice cannot finely control Retry, Timeout
Istio distributed tracing breaks at cluster boundaries (traced independently in each cluster)

Practical Examples

Example 1: Global E-commerce (Multi-Primary + VPC Lattice)

Architecture

Decision:

Intra-cluster (Frontend <-> Cart <-> Order): Use Istio
- Reason: Frequent calls, complex routing, Circuit Breaker needed
Cross-cluster (Order -> Payment): Use VPC Lattice
- Reason: Relatively simple calls, leverage AWS IAM authentication, simple management

Configuration Example

Cluster 1/2: Frontend -> Cart (Istio)

yaml

apiVersion: networking.istio.io/v1
kind: VirtualService
metadata:
  name: cart-service
  namespace: default
spec:
  hosts:
  - cart.default.svc.cluster.local
  http:
  - match:
    - headers:
        user-type:
          exact: premium
    route:
    - destination:
        host: cart.default.svc.cluster.local
        subset: v2
      weight: 100
  - route:
    - destination:
        host: cart.default.svc.cluster.local
        subset: v1
      weight: 100
---
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: cart-service
spec:
  host: cart.default.svc.cluster.local
  trafficPolicy:
    connectionPool:
      tcp:
        maxConnections: 100
      http:
        http1MaxPendingRequests: 1024
        maxRequestsPerConnection: 10
    outlierDetection:
      consecutiveErrors: 5
      interval: 10s
      baseEjectionTime: 30s
  subsets:
  - name: v1
    labels:
      version: v1
  - name: v2
    labels:
      version: v2

Cluster 1/2: Order -> Payment (VPC Lattice)

yaml

# ServiceEntry for VPC Lattice
apiVersion: networking.istio.io/v1
kind: ServiceEntry
metadata:
  name: payment-service-lattice
  namespace: default
spec:
  hosts:
  - payment.lattice.svc.cluster.local
  location: MESH_EXTERNAL
  ports:
  - number: 443
    name: https
    protocol: HTTPS
  resolution: DNS
  endpoints:
  - address: payment-service-abc123.vpc-lattice.amazonaws.com
---
# DestinationRule: VPC Lattice TLS
apiVersion: networking.istio.io/v1beta1
kind: DestinationRule
metadata:
  name: payment-service-lattice
spec:
  host: payment.lattice.svc.cluster.local
  trafficPolicy:
    tls:
      mode: SIMPLE  # VPC Lattice handles TLS

Example 2: Disaster Recovery (DR) Scenario

Active-Standby with Route53 Failover

yaml

# Cluster 1 (Active): Health Check Endpoint
apiVersion: v1
kind: Service
metadata:
  name: health-check
  namespace: istio-system
  annotations:
    service.beta.kubernetes.io/aws-load-balancer-type: "nlb"
    external-dns.alpha.kubernetes.io/hostname: api.example.com
    external-dns.alpha.kubernetes.io/set-identifier: "us-east-1-primary"
    external-dns.alpha.kubernetes.io/aws-health-check-id: "health-check-primary"
spec:
  type: LoadBalancer
  selector:
    app: health-check
  ports:
  - port: 80
    targetPort: 8080
---
# Cluster 2 (Standby): Health Check Endpoint
apiVersion: v1
kind: Service
metadata:
  name: health-check
  namespace: istio-system
  annotations:
    service.beta.kubernetes.io/aws-load-balancer-type: "nlb"
    external-dns.alpha.kubernetes.io/hostname: api.example.com
    external-dns.alpha.kubernetes.io/set-identifier: "us-west-2-standby"
    external-dns.alpha.kubernetes.io/aws-health-check-id: "health-check-standby"
spec:
  type: LoadBalancer
  selector:
    app: health-check
  ports:
  - port: 80
    targetPort: 8080

Route53 Health Check and Failover Policy:

bash

# Create Primary Health Check
aws route53 create-health-check \
  --caller-reference "$(date +%s)" \
  --health-check-config \
    Type=HTTPS,ResourcePath=/healthz,FullyQualifiedDomainName=${PRIMARY_LB_DNS},Port=443

# Failover Routing Policy
aws route53 change-resource-record-sets \
  --hosted-zone-id ${ZONE_ID} \
  --change-batch file://failover-config.json

failover-config.json:

json

{
  "Changes": [
    {
      "Action": "CREATE",
      "ResourceRecordSet": {
        "Name": "api.example.com",
        "Type": "A",
        "SetIdentifier": "Primary",
        "Failover": "PRIMARY",
        "AliasTarget": {
          "HostedZoneId": "${NLB_ZONE_ID}",
          "DNSName": "${PRIMARY_LB_DNS}",
          "EvaluateTargetHealth": true
        },
        "HealthCheckId": "${PRIMARY_HEALTH_CHECK_ID}"
      }
    },
    {
      "Action": "CREATE",
      "ResourceRecordSet": {
        "Name": "api.example.com",
        "Type": "A",
        "SetIdentifier": "Secondary",
        "Failover": "SECONDARY",
        "AliasTarget": {
          "HostedZoneId": "${NLB_ZONE_ID}",
          "DNSName": "${STANDBY_LB_DNS}",
          "EvaluateTargetHealth": true
        }
      }
    }
  ]
}

Performance and Cost Comparison

Performance Comparison

Metric	Single-cluster	Multi-cluster Istio	Hybrid (Istio + Lattice)
Intra-cluster latency	~2ms	~2ms	~2ms
Cross-cluster latency	N/A	+5-10ms (East-West GW)	+3-5ms (VPC Lattice)
Throughput (RPS)	10,000	8,500	9,200
CPU overhead	+10%	+15%	+12%
Memory usage	+50MB/pod	+70MB/pod	+55MB/pod

Cost Comparison (Monthly, 2 clusters)

Item	Single-cluster	Multi-cluster Istio	Hybrid	VPC Lattice only
Control Plane	$50	$100 (x2)	$100 (x2)	$0
East-West Gateway	$0	$100 (NLB x2)	$0	$0
Cross-region transfer	$0	$200 (10TB)	$100 (5TB)	$100 (5TB)
VPC Lattice	$0	$0	$30	$50
Operations personnel	$10,000	$15,000	$12,000	$8,000
Total estimated cost	~$10,050	~$15,400	~$12,230	~$8,150

Cost saving tips:

Cross-region transfer costs can be reduced with VPC Peering
VPC Lattice is throughput-based billing -> traffic optimization essential
90% resource overhead reduction with Ambient Mode

ROI Analysis

Multi-cluster Istio investment value:

Strongly recommended when downtime cost > $1,000/hour
Recommended when global customer experience is important
Excessive investment for small startups

Hybrid approach sweet spot:

AWS-centric architecture
Complex logic intra-cluster
Simple connectivity cross-cluster

Troubleshooting

bash

# Verify cross-cluster connectivity
istioctl ps --context="${CTX_CLUSTER1}"
istioctl ps --context="${CTX_CLUSTER2}"

# Check Remote Secret
kubectl get secrets -n istio-system --context="${CTX_CLUSTER1}"

# Verify cross-cluster traffic
kubectl logs -n istio-system -l app=istiod --context="${CTX_CLUSTER1}"

References

Official Documentation

Blogs and Case Studies

Ambient Mode - Resource optimization
mTLS - Secure cross-cluster communication
VPC Lattice - AWS managed service networking

Summary

Multi-cluster Service Mesh is powerful but increases complexity and cost. Decision guide:

Choice	Suitable when	Key pros	Key cons
Single-cluster	Single region, small scale	Simple management, low cost	Single point of failure, no geographic distribution
Multi-cluster Istio	Global services, strong L7 needed	Full control, all Istio features	High complexity, high cost
VPC Lattice	AWS-centric, simple connectivity	AWS managed, low operational burden	Limited Istio features, AWS lock-in
Hybrid	AWS environment, complex internal + simple external	Balanced complexity and features	Need to understand two technology stacks

Recommended approach:

Start with Single-cluster
When multi-region needed -> Consider Hybrid (Istio + VPC Lattice)
When strong L7 control essential -> Multi-cluster Istio
When operational simplification priority -> VPC Lattice only

Traffic Management

Security

Observability

Resilience

Advanced

Comparison Guide

ArgoCD

Metrics

Logging

Tracing

Alerting

Observability End-to-End Labs

Cilium Deep Dive

Calico Deep Dive

Istio Detailed Quiz

Linkerd Detailed Quiz

Cilium Service Mesh Detailed Quiz

ArgoCD Detailed Quiz

Metrics

Logging

Tracing

Alerting

Observability Labs

Multi-cluster ​

Table of Contents ​

Do You Really Need Multi-cluster? ​

Decision Flow ​

When Multi-cluster is Needed ​

1. Geographic Distribution and Latency Optimization ​

2. Disaster Recovery (DR) ​

3. Environment Separation and Staged Deployment ​

4. Organizational Boundaries and Security Isolation ​

When Multi-cluster is NOT Needed ​

1. Single Region, Small Scale Services ​

2. When Operational Complexity Cannot Be Handled ​

3. When Cost is a Key Consideration ​

Checklist ​

Architecture Selection Guide ​

Optimal Solution by Scenario ​

Comparison of Each Solution ​

Single-cluster Istio ​

Multi-cluster Istio ​

AWS VPC Lattice ​

Istio vs AWS VPC Lattice ​

Feature Comparison ​

Architecture Pattern Comparison ​

Pattern 1: Istio Multi-cluster Only ​

Pattern 2: VPC Lattice Only ​

Pattern 3: Hybrid (Recommended) ​

Multi-cluster Overview ​

Topology ​

Primary-Remote ​

Multi-Primary ​

Primary-Remote Setup ​

1. Primary Cluster Setup ​

2. Remote Cluster Setup ​

Multi-Primary Setup ​

1. Set Both Clusters as Primary ​

2. Cross-register Remote Secrets ​

Cross-cluster Communication ​

Service Entry ​

Using with VPC Lattice ​

Hybrid Architecture Implementation ​

Step 1: Install Istio Independently in Each Cluster ​

Step 2: Create VPC Lattice Service Network ​

Step 3: Register Kubernetes Service to VPC Lattice ​

Step 4: IAM Policy Setup ​

Traffic Flow ​

Pros and Considerations ​

Practical Examples ​

Example 1: Global E-commerce (Multi-Primary + VPC Lattice) ​

Architecture ​

Configuration Example ​

Example 2: Disaster Recovery (DR) Scenario ​

Active-Standby with Route53 Failover ​

Performance and Cost Comparison ​

Performance Comparison ​

Cost Comparison (Monthly, 2 clusters) ​

ROI Analysis ​

Troubleshooting ​

Multi-cluster

Table of Contents

Do You Really Need Multi-cluster?

Decision Flow

When Multi-cluster is Needed

1. Geographic Distribution and Latency Optimization

2. Disaster Recovery (DR)

3. Environment Separation and Staged Deployment

4. Organizational Boundaries and Security Isolation

When Multi-cluster is NOT Needed

1. Single Region, Small Scale Services

2. When Operational Complexity Cannot Be Handled

3. When Cost is a Key Consideration

Checklist

Architecture Selection Guide

Optimal Solution by Scenario

Comparison of Each Solution

Single-cluster Istio

Multi-cluster Istio

AWS VPC Lattice

Istio vs AWS VPC Lattice

Feature Comparison

Architecture Pattern Comparison

Pattern 1: Istio Multi-cluster Only

Pattern 2: VPC Lattice Only

Pattern 3: Hybrid (Recommended)

Multi-cluster Overview

Topology

Primary-Remote

Multi-Primary

Primary-Remote Setup

1. Primary Cluster Setup

2. Remote Cluster Setup

Multi-Primary Setup

1. Set Both Clusters as Primary

2. Cross-register Remote Secrets

Cross-cluster Communication

Service Entry

Using with VPC Lattice

Hybrid Architecture Implementation

Step 1: Install Istio Independently in Each Cluster

Step 2: Create VPC Lattice Service Network

Step 3: Register Kubernetes Service to VPC Lattice

Step 4: IAM Policy Setup

Traffic Flow

Pros and Considerations

Practical Examples

Example 1: Global E-commerce (Multi-Primary + VPC Lattice)

Architecture

Configuration Example

Example 2: Disaster Recovery (DR) Scenario

Active-Standby with Route53 Failover

Performance and Cost Comparison

Performance Comparison

Cost Comparison (Monthly, 2 clusters)

ROI Analysis

Troubleshooting

References

Official Documentation

Blogs and Case Studies

Related Documents

Summary