CV0-003 · Question #812
A cloud engineer, who manages workloads in a public cloud environment, uses autoscaling to maintain availability of a critical application. During a recent burst in demands, the engineer received the
The correct answer is B. The cloud account has exhausted the number of instances quota.. A LimitedInstanceCapacity error means the cloud account has hit its service quota for the number of running instances, preventing autoscaling from launching new ones.
Question
A cloud engineer, who manages workloads in a public cloud environment, uses autoscaling to maintain availability of a critical application. During a recent burst in demands, the engineer received the following error alert:
LimitedInstanceCapacity Which of the following is MOST likely cause of the error?
Options
- AThe cloud account has a misconfigured security group.
- BThe cloud account has exhausted the number of instances quota.
- CThe cloud account has had rights revoked to create instances.
- DThe autoscaling feature does not have permissions to create instances.
How the community answered
(20 responses)- A5% (1)
- B95% (19)
Why each option
A LimitedInstanceCapacity error means the cloud account has hit its service quota for the number of running instances, preventing autoscaling from launching new ones.
A misconfigured security group controls inbound and outbound traffic rules and would cause network connectivity failures after an instance launches, not a provisioning capacity error.
Cloud providers enforce per-account service quotas on the number of instances that can run simultaneously in a region or availability zone. When autoscaling attempts to launch additional instances during a demand burst and the account's quota is exhausted, the provider returns a capacity limit error such as LimitedInstanceCapacity, blocking further scale-out until the quota is increased or existing instances are terminated.
Revoked rights to create instances would generate an authorization or AccessDenied error from the IAM or permissions layer, not a capacity limit error.
Autoscaling lacking permissions to create instances would also produce an IAM authorization or permission-denied error, which is distinct from a resource quota or capacity limit error.
Concept tested: Cloud service quotas and autoscaling instance limits
Source: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-resource-limits.html
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