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Ensuring High Availability in Google Cloud
Learn how to tackle questions about high availability in the GCP Associate Cloud Engineer exam with this detailed walkthrough.
A common stumbling block for candidates is understanding strategies for high availability in cloud applications. Many focus too much on management simplicity instead of resilience against failures.
The question
A company has a critical application running on Google Cloud that requires high availability and minimal downtime. Which strategy should you implement to ensure the application can withstand unexpected failures?
- A. Deploy the application in a single region to simplify management.
- B. Use Google Cloud Load Balancing with multiple backend instances across multiple zones.
- C. Set up a single instance with auto-scaling enabled.
- D. Create snapshots of the instance every hour.
Think before you scroll
Evaluate the options by considering how each one contributes to the application's ability to remain operational during failures. High availability requires redundancy and quick recovery options.
The answer
The correct option is B: Use Google Cloud Load Balancing with multiple backend instances across multiple zones. This strategy ensures that if one zone experiences issues, the application can still operate through instances in other zones, maintaining high availability and minimal downtime.
Why the other options lose
- A. Deploy the application in a single region to simplify management. This option sacrifices redundancy. A single region means that if that region fails, the application goes down. It does not meet the high availability requirement.
- C. Set up a single instance with auto-scaling enabled. While auto-scaling can handle increased load, it does not provide redundancy. If that single instance fails, the application is still down. High availability requires multiple instances across different zones.
- D. Create snapshots of the instance every hour. Snapshots are useful for backups but do not provide real-time availability. If an instance fails, relying on snapshots alone does not ensure the application stays operational. Snapshots help in recovery, not in preventing downtime.
The concept behind it
High availability is achieved through redundancy and load balancing across multiple zones. By distributing the application across various zones, you can ensure that even if one zone fails, others can take over, providing continuous service. This principle applies to any cloud application needing resilience against failures.
Exam trap to remember
Always prioritize redundancy and multi-zone deployment for critical applications to ensure high availability.