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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.

Troubleshooting

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)
  • A
    5% (1)
  • B
    95% (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.

AThe cloud account has a misconfigured security group.

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.

BThe cloud account has exhausted the number of instances quota.Correct

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.

CThe cloud account has had rights revoked to create instances.

Revoked rights to create instances would generate an authorization or AccessDenied error from the IAM or permissions layer, not a capacity limit error.

DThe autoscaling feature does not have permissions to create instances.

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

Topics

#autoscaling#instance quota#capacity limits#public cloud

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