Question 1,425 of 256
DOP-C02 SDLC Automation Practice Question
During a deployment using AWS CodeDeploy, the deployment fails with the error 'The overall deployment failed because too many individual instances failed deployment, too few healthy instances are available, or some instances in your deployment group are experiencing problems.' The deployment group is configured with a minimum healthy instances of 75%. What could be the cause?
⚠ Common exam trap
Many candidates confuse the 'minimum healthy instances' threshold with other deployment configuration settings like timeout values or agent health, when in fact the error message directly indicates that the threshold of 75% healthy instances was breached because more than 25% of instances failed.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
More than 25% of the instances failed the deployment.
The error message explicitly states that too many individual instances failed deployment and too few healthy instances are available. With a minimum healthy instances setting of 75%, the deployment fails when more than 25% of the instances in the deployment group fail their deployment. This is a built-in safety mechanism in AWS CodeDeploy to prevent cascading failures and ensure application availability.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The deployment configuration timeout is too short.
Why it's wrong here
A too-short deployment configuration timeout is not the cause because CodeDeploy's deployment configuration controls the minimum percentage or count of healthy instances (e.g., MinimumHealthyHosts), not an overall wall-clock timeout. If a lifecycle event exceeds its hook timeout, the failure appears as 'Timeout' or 'ScriptFailed' on that specific hook, not as a fleet-level failure due to a health threshold.
- ✗
The CodeDeploy service role does not have sufficient permissions.
Why it's wrong here
If the CodeDeploy service role lacks sufficient IAM permissions, the deployment would fail before or during provisioning with an authorization or access-denied error, such as being unable to assume the role, describe EC2 instances, or fetch the application revision from Amazon S3. This produces a configuration/infrastructure error in the deployment history, not a symptom where more than 25% of instances fail the deployment due to an unhealthy fleet.
- ✗
The instances are not running the CodeDeploy agent.
Why it's wrong here
When instances are not running the CodeDeploy agent, the deployment group appears without registered or reachable hosts, and CodeDeploy cannot push the AppSpec file or run lifecycle hooks on them. The deployment may ultimately fail because no healthy instances are available, but the console or API would report missing agents/registration, not a threshold-based failure caused by multiple instances failing during the deployment.
- ✓
More than 25% of the instances failed the deployment.
Why this is correct
A deployment configuration with a 25% failure margin means that the minimum healthy instances threshold is set to 75% (or the equivalent fleet percentage). CodeDeploy continuously monitors the health of each instance across lifecycle events; if more than one quarter of the instances fail or abort, the remaining healthy percentage drops below 75%, and CodeDeploy terminates the deployment to protect the service. The state becomes 'Failed' with a message about the minimum healthy instances threshold being breached.
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Last reviewed: Jul 4, 2026
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