Deploy an application that accepts TCP traffic, requires exclusive filesystem control (concurrent access causes corruption), cannot scale horizontally, and can tolerate occasional downtime but must be available 24/7. What architecture on GCP meets these constraints?
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Correct answer: Use an unmanaged instance group with an active and standby instance in different zones, use a regional persistent disk, and use a network load balancer in front of the instances..
Why this is the answer
The application's need for exclusive filesystem control and inability to scale horizontally rules out solutions like Cloud Filestore or managed instance groups, which are designed for scalability and shared access. A regional persistent disk provides data redundancy across zones, crucial for 24/7 availability with tolerance for occasional downtime, and can be attached to a single VM at a time. An unmanaged instance group with an active/standby setup across zones allows for failover. A network load balancer is necessary because the application accepts TCP traffic, whereas an HTTP load balancer only handles HTTP/S.
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