Overview
This section uses typical web applications as an example to describe the typical architectures deployed with different availability objectives. In each scenario, design an architecture with the items listed in the table below taken into account, so as to achieve the availability objective.
Item |
Impact on Application Availability |
---|---|
Redundancy |
High availability of application components and automatic service recovery upon faults of some application nodes |
Backup |
Recovery capability when application data is damaged |
DR |
Recovery capability in the event of a disaster in a region, AZ, IDC, or other cloud sites |
Monitoring metrics and alarms |
Capabilities of detection and alarm reporting for application system faults |
Auto scaling |
Automatic recovery capability when the application capacity is insufficient |
Change error prevention |
Capability of reducing the downtime caused by changes in applications |
Emergency recovery |
Emergency recovery capability upon application faults |
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