Google ACE Ensuring Successful Operation of a Cloud Solution Practice Test 6 — 15 Questions

Question 1

A site reliability engineer needs to be notified immediately when the error rate of a production microservice exceeds 5% over a 5-minute window. Which type of alerting policy should be used?

Accepted Answer

Metric threshold alert. A metric threshold alert triggers when a metric crosses a threshold. This scenario requires tracking the error rate metric and alerting when it exceeds 5%.

Answer

Uptime check alert

Answer

Pub/Sub notification hook

Answer

Log-based alert (log metric trigger)

Question 2

You manage a Google Kubernetes Engine (GKE) cluster and need to update the deployment 'web-app' to use a new container image tag 'v2'. You also want to ensure the update proceeds and, if it fails, roll back to the previous revision. Which set of commands should you use?

Accepted Answer

kubectl set image deployment/web-app web-app=gcr.io/myproject/web-app:v2; kubectl rollout status; kubectl rollout undo. kubectl set image updates the image; kubectl rollout status monitors progress; kubectl rollout undo reverts to the previous revision.

Answer

gcloud container clusters upgrade; kubectl rollout status; kubectl rollout undo

Answer

kubectl edit deployment web-app; kubectl rollout status; kubectl delete deployment web-app

Answer

kubectl apply -f web-app.yaml; kubectl rollout status; kubectl rollout undo

Question 3

Your organization runs a critical application on Compute Engine VMs. You have created a snapshot schedule, but you need to ensure that snapshots of disks attached to running instances are crash-consistent. What must you do before taking the snapshot?

Accepted Answer

Stop the VM before taking the snapshot. Crash-consistent snapshots require no special preparation if the disk is not attached or the VM is stopped. For running instances, you must stop the VM or flush disk caches to ensure crash consistency.

Answer

Detach the disk from the instance

Answer

Enable guest OS features for the instance

Answer

Use the --no-pause flag when creating the snapshot

Question 4

A team needs to analyze application logs to find errors from the last 24 hours. The logs are stored in Cloud Logging. Which query language filters would select log entries where the severity is ERROR and the resource type is a GCE VM instance?

Accepted Answer

resource.type = 'gce_instance' AND severity = 'ERROR'. Cloud Logging query language uses filters like resource.type and severity. The correct syntax uses parentheses for conditions.

Answer

resource.type:gce_instance AND severity:ERROR

Answer

resource.type == 'gce_instance' && severity == 'ERROR'

Answer

type='gce_instance' AND level='ERROR'

Question 5

You want to export a subset of Cloud Logging logs to BigQuery for long-term analysis. Which method should you use?

Accepted Answer

Create a log sink with a filter and destination BigQuery. Log sinks route logs to destinations like BigQuery, Cloud Storage, or Pub/Sub. Creating a sink with a filter is the correct approach.

Answer

Create a log-based metric and export the metric to BigQuery

Answer

Set up a Cloud Function that triggers on logs and inserts into BigQuery

Answer

Use gcloud logging read and pipe to bq load

Question 6

A Cloud Run service is experiencing high latency. You suspect one revision is causing the issue. The service is configured to split traffic 90% to revision A and 10% to revision B. You want to gradually shift traffic back to revision A only. Which command should you use?

Accepted Answer

gcloud run services update-traffic my-service --to-revisions=my-service-00001=100. gcloud run services update-traffic allows you to set traffic percentages for revisions. Setting 100% to revision A achieves the goal.

Answer

kubectl set traffic my-service --revision=my-service-00001=100

Answer

gcloud run revisions delete my-service-00002

Answer

gcloud run services update my-service --set-revision my-service-00001

Question 7

You need to collect and analyze latency traces for a microservices application running on GKE. You want to identify which services are contributing to overall latency. Which Google Cloud service should you enable and use?

Accepted Answer

Cloud Trace. Cloud Trace is a distributed tracing service that collects latency data from applications and provides tools to analyze performance bottlenecks.

Answer

Cloud Logging

Answer

Cloud Profiler

Answer

Cloud Monitoring

Question 8

You have a Compute Engine instance that is running a CPU-intensive workload. After monitoring, you realize the machine type needs to be upgraded to a larger CPU. What is the correct sequence to change the machine type?

Accepted Answer

Stop the instance, run gcloud compute instances set-machine-type, then start the instance. Changing the machine type requires stopping the instance, then using gcloud compute instances set-machine-type, and finally starting the instance.

Answer

Run gcloud compute instances set-machine-type while the instance is running

Answer

Delete the instance and create a new one with the desired machine type

Answer

Use gcloud compute instances update to change the machine type

Question 9

You are troubleshooting a Pub/Sub subscription that is not receiving messages as fast as they are published. You want to check if there is a backlog of unacknowledged messages for the subscription. What should you use?

Accepted Answer

Use Cloud Monitoring to view the 'oldest_unacked_message_age' metric. Cloud Monitoring has a metric for Pub/Sub subscription backlog (oldest unacknowledged message age or num_undelivered_messages).

Answer

Check the Cloud Logging logs for the subscription

Answer

Use gcloud pubsub subscriptions describe and check the ackDeadlineSeconds

Answer

Check the Cloud Console Pub/Sub dashboard for the topic publish rate

Question 10

You have a GKE cluster with a node pool that needs to scale automatically based on load. The cluster was created with autoscaling disabled. Which command enables autoscaling on an existing node pool?

Accepted Answer

gcloud container node-pools update my-pool --cluster=my-cluster --enable-autoscaling --min-nodes=1 --max-nodes=10. gcloud container node-pools update with --enable-autoscaling and min/max node parameters enables autoscaling.

Answer

gcloud container node-pools create my-pool --enable-autoscaling

Answer

kubectl autoscale node-pool my-pool --min=1 --max=10

Answer

gcloud container clusters update my-cluster --enable-autoscaling

Question 11

You need to perform a rolling update of a GKE deployment and ensure that during the update, the new pods are ready before terminating the old ones. You have already set the update strategy to RollingUpdate. Which kubectl command sequence should you use to update the image and monitor the rollout?

Accepted Answer

kubectl set image deployment/myapp myapp=gcr.io/myproject/myapp:v2; kubectl rollout status deployment/myapp. kubectl set image updates the image; kubectl rollout status monitors the progress. If the rollout fails, kubectl rollout undo rolls back.

Answer

gcloud container clusters upgrade my-cluster; kubectl get deployments

Answer

kubectl edit deployment myapp; kubectl get pods; kubectl delete pod old-pod

Answer

kubectl apply -f deployment.yaml; kubectl rollout undo deployment/myapp

Question 12

A Cloud Run service named 'my-service' is currently serving 100% traffic to revision 'rev1'. You deploy a new revision 'rev2' and want to gradually shift traffic so that rev2 receives 10% of requests. Which command should you use?

Accepted Answer

gcloud run services update-traffic my-service --to-revisions=rev2=10,rev1=90. gcloud run services update-traffic allows you to set traffic percentages per revision. The syntax is --to-revisions=REVISION=PERCENTAGE.

Answer

gcloud run services update my-service --traffic=rev2=10%

Answer

gcloud run deploy my-service --image=... --traffic=rev2=10

Answer

gcloud run revisions update rev2 --traffic=10

Question 13

You are designing a disaster recovery plan for a stateful application running on Compute Engine. You need to create crash-consistent backups of persistent disks every hour and store them in a different region for at least 30 days. Which TWO steps should you take? (Choose two.)

Accepted Answer

Stop the VM before taking each snapshot. Snapshots are stored in regional locations, but can be moved using image creation. You need to stop the instance for crash consistency, then create snapshots. To store in a different region, you can create a disk from the snapshot in the new region or use image sharing. The correct combination: stop the instance, create a snapshot, then copy or store the snapshot in the target region.

Answer

Use gcloud compute images create to create a custom image from the snapshot, then export to a different region

Answer

Create a snapshot schedule using gcloud compute resource-policies

Answer

Use gcloud compute snapshots create with the --source-disk flag while the VM is running

Question 14

You need to drain a GKE node for maintenance without disrupting running workloads that are managed by a DaemonSet. Which TWO flags should you use with kubectl drain? (Choose two.)

Accepted Answer

--delete-emptydir-data. kubectl drain evicts pods. By default, it will fail if there are pods not managed by a ReplicationController/ReplicaSet/Deployment or if there are DaemonSet pods. The --ignore-daemonsets flag allows draining despite DaemonSet pods. The --delete-emptydir-data flag is needed if any pods use emptyDir volumes.

Answer

--grace-period=0

Answer

--disable-eviction

Answer

--force

Question 15

You want to create a monitoring dashboard that shows a time-series chart of CPU utilization for a specific Compute Engine instance. Which THREE components do you need to configure? (Choose three.)

Accepted Answer

Choose a time aggregation function (e.g., mean, max). In Cloud Monitoring, to create a chart you need to select a metric, a resource, and a time aggregation function.

Answer

Create a log-based metric for CPU utilization

Answer

Set up a notification channel to send alerts