Your e-commerce site currently runs on a group of Compute Engine instances located in a single zone. To maintain availability if that zone becomes unavailable, which Google Cloud design change should you implement while keeping day-to-day management effort low?
Convert the VMs to preemptible instances to lower cost.
Replace the existing VMs with a newer Compute Engine machine type in the same zone.
Move the instances into a regional managed instance group that spans multiple zones and place it behind a Cloud Load Balancer.
Transfer the project's resources to a different billing account.
A regional managed instance group (MIG) automatically distributes its VM instances across multiple zones within the same region. When it is placed behind Cloud Load Balancing, traffic is served only to healthy instances, so a zonal outage does not interrupt the service. Simply upgrading machine types, using preemptible VMs, or changing billing accounts does not add fault-tolerance across zones and therefore would not protect the application from a zone-level failure.
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What is a Regional Managed Instance Group (MIG)?
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How does Cloud Load Balancing work with a Regional MIG?
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Why are preemptible instances unsuitable for maintaining availability?
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What is a Managed Instance Group (MIG) in Google Cloud?
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What is Cloud Load Balancing and its role in improving availability?
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Why is a regional Managed Instance Group better for fault tolerance than zonal resources?
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