Virtual Clusters
VCluster (Virtual Cluster) enables you to run multiple isolated Kubernetes clusters (vclusters) within a single host cluster. This is ideal for multi-tenant, development, testing, and regional deployments on AKS, EKS, GKE, or on-prem clusters.
Real-Life Use Cases
- Multi-Tenant SaaS: Isolate customer workloads in separate vclusters for security and compliance.
- Dev/Test Environments: Spin up ephemeral vclusters for feature branches, CI/CD, or integration testing without impacting production.
- Regional Deployments: Deploy vclusters per region to meet data residency or regulatory requirements.
- Platform Engineering: Empower teams to manage their own vclusters with full Kubernetes API access, while centralizing infrastructure management.
Step-by-Step: Deploying a vcluster
- Install vcluster CLI:
curl -sSL https://vcluster.com/download | bash # or use Homebrew brew install vcluster - Create a vcluster in a namespace:
kubectl create namespace dev-team vcluster create dev-vcluster -n dev-team - Connect to the vcluster:
vcluster connect dev-vcluster -n dev-team # This updates your kubeconfig to point to the vcluster kubectl get nodes - Deploy workloads in the vcluster:
kubectl apply -f my-app.yaml - List and manage vclusters:
vcluster list vcluster delete dev-vcluster -n dev-team
Best Practices
- Use separate namespaces for each vcluster to ensure isolation.
- Automate vcluster lifecycle (creation, deletion) in CI/CD pipelines for ephemeral environments.
- Monitor resource usage in the host cluster to avoid noisy neighbor issues.
- Use RBAC and network policies to restrict access between vclusters.
- Store vcluster configuration and manifests in Git for GitOps workflows.
Common Pitfalls
- Overcommitting host cluster resources (CPU, memory) can impact all vclusters.
- Not cleaning up unused vclusters leads to resource waste.
- Assuming vcluster isolation is equivalent to physical cluster isolation (some host-level risks remain).
- Manual changes outside of Git in GitOps-managed environments.