High availability patterns and geographic resource separation
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4 Terms
Failover
In the event of an outage, like an on-premises data center failure, a failover can be implemented to serve the same workload from a public cloud. May require changing DNS settings to public cloud endpoint
Failback
After the on premises or private cloud infrastructure becomes healthy again, a failback can be performed by making another DNS change to move end users or clients from the public cloud back to the on-premises infrastructure.
availability zone
Comprises one or more data centers, which appear as a single group of infrastructure to end users. While individual resources within an availability zone might lack redundancy. combining resources across multiple availability zones can create an overall highly available infrastructure.
Region
Consists of multiple physically separate availability zones. Unlike availability zones, which may be close together, regions are separated by larger distances, often tens or hundreds of miles or kilometers. This separation is designed to enhance resilience. Public cloud services are primarily hosted across regions, making it common unit of resource scope, especially for SaaS offerings.