Hybrid Cloud Architectures

Hybrid cloud platforms extend cloud services and management to on-premises data centers, providing consistent experiences across cloud and edge locations.

AWS Outposts brings native AWS services, infrastructure, and operating models to on-premises facilities. Outposts racks and servers run AWS hardware with local AWS services including EC2, EBS, ECS, RDS, EMR, and EKS. Outposts connects to the nearest AWS Region for management and additional services. Use cases include: data residency requirements that mandate local processing, ultra-low latency applications like industrial automation, and local data processing that cannot tolerate network latency to the cloud.

Azure Stack Hub and HCI extend Azure services to on-premises environments. Azure Stack Hub provides a connected cloud experience with Azure services running locally. Azure Stack HCI is a hyperconverged infrastructure solution running Azure virtual machines on-premises. Both integrate with Azure for identity, management, and governance.

Google Anthos provides a multi-cloud and hybrid platform built on Kubernetes. Anthos runs on-premises (Anthos on Bare Metal, Anthos on VMware) and across cloud providers (GKE, AWS, Azure). It extends Google Cloud services like Istio service mesh to any environment. Anthos is strong for organizations with existing Kubernetes deployments.

Consistent Management across hybrid environments requires unified tools. AWS Systems Manager extends to on-premises servers through hybrid activations. Azure Arc manages resources across Azure, on-premises, and multi-cloud. These tools provide inventory management, policy enforcement, and monitoring across the entire hybrid estate.

Data Synchronization between cloud and on-premises is a key challenge. AWS DataSync transfers files between on-premises NFS/SMB and S3. AWS Storage Gateway provides on-premises access to cloud storage. Choose synchronous replication for real-time consistency or asynchronous for lower latency impact.

Designing hybrid architectures requires careful planning of DNS resolution, identity federation, network connectivity, and workload placement decisions.

Hybrid DNS enables name resolution across on-premises and cloud environments. AWS Route 53 Resolver outbound endpoints forward DNS queries from VPC to on-premises DNS servers. Inbound endpoints allow on-premises systems to resolve Route 53 private hosted zones. Configure conditional forwarders on-premises to route AWS-specific domains to Route 53.

Identity Federation provides single sign-on across cloud and on-premises. AWS IAM Identity Center federates with Active Directory, providing access to AWS accounts and SaaS applications. Azure AD Connect synchronizes on-premises AD with Azure AD for hybrid identity. Use SAML 2.0 or OIDC protocols for standard-based federation.

Network Connectivity between cloud and on-premises uses AWS Direct Connect, site-to-site VPN, or SD-WAN solutions. Direct Connect provides dedicated connections with consistent bandwidth. VPN offers encrypted connectivity over the internet. Combine both for production workloads: Direct Connect for primary traffic and VPN for backup.

Workload Placement Decisions consider data gravity, latency requirements, compliance, and cost. Workloads processing large datasets should reside near their data stores. Latency-sensitive applications need local deployment. Compliance requirements may mandate specific locations. Cost analysis compares on-premises running costs against cloud alternatives including data transfer fees.

Data Gravity refers to the tendency of data to attract workloads. Large datasets in on-premises databases make it expensive to move workloads to the cloud due to data transfer costs and latency. When placing workloads, consider where the majority of data resides and whether the network can support the required data flow. Place compute near data rather than moving data to compute.