Q: Your enterprise operates 15 Kubernetes clusters distributed across AWS (EKS), GCP (GKE), and Azure (AKS). Teams currently use separate deployment pipelines per cloud, resulting in configuration drift, inconsistent security policies, and fragmented release tracking. How do you design and enforce a centralized multi-cloud GitOps architecture with Argo CD?

Establish a dedicated, hardened management Kubernetes cluster:

• Hub Cluster: Deployed high-availability Argo CD on a dedicated management cluster with HA Redis and multi-replica controllers.
• SSO Integration: Integrated enterprise Okta / Entra ID SSO via OIDC, enforcing RBAC roles mapping engineering teams to specific target cloud clusters.

Establish secure API server connectivity and service accounts across clouds:

• Cluster Registration: Registered clusters via argocd cluster add eks-prod --name aws-us-east-1, argocd cluster add gke-prod --name gcp-us-central1, and argocd cluster add aks-prod --name az-eastus.
• Cluster Labels: Tagged clusters with metadata: cloud: aws, region: us-east-1, env: prod, compliance: pci.

Automate multi-cluster application distribution using declarative templates:

• Matrix Generator: Declared an ApplicationSet combining a Git directory generator with a Cluster generator matching cloud in (aws, gcp, azure).
• Dynamic Parameterization: Helm values dynamically inject cloud-specific configurations: aws.ingress.class on EKS, gce.ingress.class on GKE, and azure.ingress.class on AKS.

Enforce automated reconciliation and canary rollouts across clouds:

• Sync Waves: Orchestrated deployments sequentially across clouds: Wave 1 (AWS Canary), Wave 2 (GCP Staging), Wave 3 (Azure & Global Production).
• Automated Drift Healing: Configured syncPolicy: { automated: { prune: true, selfHeal: true } }, automatically undoing manual kubectl edits within 60 seconds.