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Difficulty: HardConfigure Azure Container Instances (ACI)

You need to host an event-processing worker in Azure Container Instances (ACI). The worker continuously monitors an external queue. The workload must meet the following configuration requirements:
- The container must run continuously under normal operation.
- If the container process terminates with a non-zero exit code due to an unhandled error, it must be restarted automatically.
- If a maintenance script gracefully terminates the container process (exit code 0), the container must remain terminated.

Which restart policy configuration should you apply to the container group?

  1. A
    Configure the container group restart policy to Always.
  2. B
    Configure the restart policy to OnFailure for the event-processing container and Never for the container group.
  3. Configure the container group restart policy to OnFailure.Answer
  4. D
    Configure the container group restart policy to Never.

Answer

Configure the container group restart policy to OnFailure.
The correct configuration is to set the container group's restart policy to OnFailure. Under this policy, Azure Container Instances (ACI) will automatically restart the container if the containerized process terminates with a non-zero exit code (indicating a failure). If the process terminates with exit code 0 (indicating success or a graceful shutdown), the container group transitions to a Succeeded state and is not restarted. This matches all specified requirements.

Step-by-Step Solution

1
Analyze the container exit behaviors and restart requirements.
Identified that the container must restart when the process exits with a non-zero code, but must not restart when the process exits with code 0.
This maps to the specific behavior of ACI restart policies, which evaluate exit codes to determine whether to restart a container.
2
Evaluate the available ACI restart policies (Always, Never, and OnFailure).
Always restarts on any exit code. Never does not restart at all. OnFailure restarts only on non-zero exit codes.
To ensure that graceful exits (code 0) do not trigger a restart, but exceptions (non-zero) do, the OnFailure policy must be selected.
3
Determine the configuration scope for restart policies in ACI.
Confirmed that the restart policy must be configured at the container group level.
ACI does not support setting restart policies on individual containers; it is applied group-wide.

Key Concept

Azure Container Instances restart policies are configured at the container group level and evaluate exit codes to determine restart behavior.
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Topics

Configure Azure Container Instances (ACI)

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