Cloud Notes
Understanding hybrid cloud architecture that combines public and private clouds, enabling workload portability, data flexibility, and optimized cost-performance balance.
A hybrid cloud combines private cloud (on-premises) infrastructure with public cloud services, allowing data and applications to move between the two environments. This approach provides organizations with greater flexibility and more deployment options while maintaining control over sensitive data.
Hybrid Cloud Architecture
How Hybrid Cloud Works
Connectivity Options
# AWS Direct Connect setup (private connection to AWS)
aws directconnect create-connection \
--location "EqDC2" \
--bandwidth "1Gbps" \
--connection-name "HQ-to-AWS"
# Azure ExpressRoute (private connection to Azure)
az network express-route create \
--name MyExpressRoute \
--resource-group hybrid-rg \
--bandwidth 1000 \
--peering-location "Silicon Valley" \
--provider "Equinix"
# Site-to-Site VPN as alternative
aws ec2 create-vpn-connection \
--type ipsec.1 \
--customer-gateway-id cgw-0123456789abcdef0 \
--vpn-gateway-id vgw-0123456789abcdef0Cloud Bursting Pattern
Cloud bursting allows workloads to "burst" from private to public cloud during peak demand:
# Kubernetes cluster spanning hybrid environment
apiVersion: v1
kind: ConfigMap
metadata:
name: hybrid-config
data:
burst-threshold: "80" # CPU percentage to trigger burst
primary-cluster: "on-premises-k8s"
burst-cluster: "eks-us-east-1"
---
# Horizontal Pod Autoscaler with cloud bursting
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
name: web-app-hpa
spec:
scaleTargetRef:
apiVersion: apps/v1
kind: Deployment
name: web-application
minReplicas: 5 # Always on-premises
maxReplicas: 100 # Burst to cloud when needed
metrics:
- type: Resource
resource:
name: cpu
target:
type: Utilization
averageUtilization: 70Hybrid Cloud Platforms
| Platform | Provider | Description |
|---|---|---|
| AWS Outposts | Amazon | AWS hardware in your data center |
| Azure Arc | Microsoft | Manage on-premises with Azure tools |
| Google Anthos | Run apps anywhere with GKE | |
| VMware Cloud on AWS | VMware/AWS | VMware workloads on AWS |
| IBM Cloud Satellite | IBM | Consistent cloud across environments |
Use Cases for Hybrid Cloud
1. Data Residency with Cloud Scalability
Keep sensitive data on-premises while using cloud for compute-heavy processing.
2. Disaster Recovery
Use public cloud as a DR site for on-premises workloads.
3. Development and Testing
Develop in the cloud, deploy to production on-premises.
4. Legacy Modernization
Gradually migrate applications from on-premises to cloud.
Advantages and Challenges
| Advantages | Challenges |
|---|---|
| Flexibility in workload placement | Complex networking setup |
| Cost optimization | Requires expertise in both environments |
| Compliance with data regulations | Data synchronization challenges |
| Gradual cloud migration path | Higher management overhead |
| Disaster recovery options | Security across environments |
| Avoid vendor lock-in | Latency between environments |
Interview Questions
- What is hybrid cloud and what problem does it solve?
Hybrid cloud combines private and public cloud environments connected via secure links. It solves the problem of organizations needing both the security/compliance of private infrastructure and the scalability/innovation of public cloud.
- Explain cloud bursting with an example.
Cloud bursting is when an application runs on private cloud normally but "bursts" to public cloud during demand spikes. Example: A retail company processes orders on-premises during normal days but bursts to AWS during Black Friday when traffic exceeds private capacity.
- What connectivity options exist between on-premises and public cloud?
Site-to-Site VPN (encrypted tunnel over internet), dedicated connections (AWS Direct Connect, Azure ExpressRoute), and SD-WAN solutions. Dedicated connections offer lower latency and more consistent performance.
- Name three hybrid cloud platforms and their key differences.
AWS Outposts (brings AWS hardware on-premises), Azure Arc (extends Azure management to any infrastructure), and Google Anthos (runs GKE-based workloads anywhere). Each brings its cloud's management experience to hybrid environments.
- What challenges do organizations face when implementing hybrid cloud?
Network complexity (VPN/Direct Connect setup), skill gaps (need expertise in both environments), data synchronization, consistent security policies across environments, and increased operational overhead.
Exam Focus
Revise definitions, diagrams, examples, and short-answer points for Hybrid Cloud.
Interview Use
Prepare one clear explanation, one practical example, and one common mistake for this Cloud Computing topic.
Search Terms
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