DevOps Quiz: Docker, Kubernetes & Terraform

#1. How can you reduce the size of a Docker image during the build process?

Use a lightweight base image

Use multiple RUN commands for each package installation

Include development dependencies in the image

Use the ADD directive instead of COPY

Explanation: Lightweight base images like alpine reduce the overall image size.

#2. Which provider configuration syntax is correct in Terraform?

provider "aws" { region = "us-west-2" }

aws_provider { region = "us-west-2" }

aws { region = "us-west-2" }

provider aws { region = "us-west-2" }

Explanation: Provider blocks define configurations for Terraform providers.

#3. How would you prevent sensitive data from being logged in Terraform state files?

Use the sensitive argument in variable definitions

Encrypt the state file manually

Use an external key management tool

Store variables in .tfvars

Explanation: Marking variables as sensitive ensures they are not logged in plaintext.

#4. What is the primary purpose of a Kubernetes Ingress?

To handle internal pod communication

To provide external HTTP and HTTPS routing to services

To allocate persistent storage to pods

To monitor pod health

Explanation: Ingress manages HTTP and HTTPS traffic routing to Kubernetes services.

#5. You want to run a container in the background and expose a port. Which command should you use?

docker run -it

docker run -d -p

docker exec -p

docker-compose up -d

Explanation: The -d flag runs the container in detached mode, and -p maps ports.

#6. Which backend is commonly used to store Terraform state in AWS?

AWS DynamoDB

Amazon RDS

Amazon S3

AWS Lambda

Explanation: S3 is the most common backend for storing Terraform state files.

#7. Which Terraform command is used to apply changes to infrastructure?

terraform init

terraform plan

terraform apply

terraform validate

Explanation: terraform apply applies the planned changes to the infrastructure.

#8. You encounter an issue where a container cannot connect to an external API. What should you check first?

The container’s DNS configuration

The CMD directive in the Dockerfile

The container’s CPU allocation

The container’s image version

Explanation: Networking issues, including DNS, often cause connectivity problems.

#9. You need to deploy an application with a dependency on a specific version of a library. How do you ensure the container uses the correct version?

Specify the version in the Docker Compose file

Include the version in the FROM directive of the Dockerfile

Use an external configuration file at runtime

Build the image using a multistage build

Explanation: The FROM directive determines the base image version, ensuring consistency.

#10. What type of Kubernetes service is used to expose an application to the internet?

ClusterIP

NodePort

LoadBalancer

ExternalName

Explanation: A LoadBalancer service routes external traffic to the application.

#11. You need to securely inject sensitive data into a Kubernetes pod. What should you use?

ConfigMap

Secret

Environment Variables

Persistent Volume

Explanation: Secrets are used to manage sensitive data securely in Kubernetes.

#12. Which Docker command would you use to view all running and stopped containers on a host?

docker ps

docker ps -a

docker container list

docker inspect

Explanation: The -a flag shows all containers, including stopped ones.

#13. You encounter a lock error when running terraform apply. What might resolve it?

Delete the .terraform directory

Run terraform force-unlock with the lock ID

Reinitialize Terraform with terraform init

Use the -lock=false flag

Explanation: Force-unlocking resolves lock contention issues in Terraform state files.

#14. Which Kubernetes object should you use to maintain a specified number of pod replicas running?

Deployment

StatefulSet

DaemonSet

ReplicaSet

Explanation: ReplicaSet ensures a specified number of pod replicas. Deployments use ReplicaSets under the hood.

#15. What happens if a resource is removed from the Terraform configuration?

It is ignored during the next apply

It is deleted during the next apply

It generates an error during plan

Terraform will prompt you to confirm the deletion

Explanation: Terraform manages the lifecycle of resources defined in its configuration.

#16. What does the terraform refresh command do?

Updates state file to match real-world resources

Resets the Terraform configuration

Deletes unused resources

Updates the provider plugin

Explanation: terraform refresh syncs the state file with actual resource statuses.

#17. How do you define a reusable module in Terraform?

Use a .module file

Organize resources in a directory and reference it in module blocks

Write a custom provider

Use a terraform block

Explanation: Modules are created by grouping Terraform configuration files into directories.

#18. Which command can you use to debug a running Kubernetes pod?

kubectl logs

kubectl exec

kubectl describe pod

All of the above

Explanation: Each command provides specific debugging information: logs for output, exec for shell access, and describe for configuration details.

#19. How can you ensure that a pod is scheduled on a specific node?

Use a Node Selector

Use an Affinity Rule

Set a Node Label and use Node Affinity

All of the above

Explanation: All listed methods can influence pod scheduling on specific nodes.

#20. You notice a pod in the CrashLoopBackOff state. What should you check first?

Logs of the failed pod

Node status

Kubernetes API server logs

Network policies

Explanation: Pod logs often provide the root cause of the failure.

DevOps Quiz: Docker, Kubernetes & Terraform

Results

#1. How can you reduce the size of a Docker image during the build process?

#2. Which provider configuration syntax is correct in Terraform?

#3. How would you prevent sensitive data from being logged in Terraform state files?

#4. What is the primary purpose of a Kubernetes Ingress?

#5. You want to run a container in the background and expose a port. Which command should you use?

#6. Which backend is commonly used to store Terraform state in AWS?

#7. Which Terraform command is used to apply changes to infrastructure?

#8. You encounter an issue where a container cannot connect to an external API. What should you check first?

#9. You need to deploy an application with a dependency on a specific version of a library. How do you ensure the container uses the correct version?

#10. What type of Kubernetes service is used to expose an application to the internet?

#11. You need to securely inject sensitive data into a Kubernetes pod. What should you use?

#12. Which Docker command would you use to view all running and stopped containers on a host?

#13. You encounter a lock error when running terraform apply. What might resolve it?

#14. Which Kubernetes object should you use to maintain a specified number of pod replicas running?

#15. What happens if a resource is removed from the Terraform configuration?

#16. What does the terraform refresh command do?

#17. How do you define a reusable module in Terraform?

#18. Which command can you use to debug a running Kubernetes pod?

#19. How can you ensure that a pod is scheduled on a specific node?

#20. You notice a pod in the CrashLoopBackOff state. What should you check first?

Leave a Reply Cancel reply

DevOps Quiz: Docker, Kubernetes & Terraform

Results

#1. How can you reduce the size of a Docker image during the build process?

#2. Which provider configuration syntax is correct in Terraform?

#3. How would you prevent sensitive data from being logged in Terraform state files?

#4. What is the primary purpose of a Kubernetes Ingress?

#5. You want to run a container in the background and expose a port. Which command should you use?

#6. Which backend is commonly used to store Terraform state in AWS?

#7. Which Terraform command is used to apply changes to infrastructure?

#8. You encounter an issue where a container cannot connect to an external API. What should you check first?

#9. You need to deploy an application with a dependency on a specific version of a library. How do you ensure the container uses the correct version?

#10. What type of Kubernetes service is used to expose an application to the internet?

#11. You need to securely inject sensitive data into a Kubernetes pod. What should you use?

#12. Which Docker command would you use to view all running and stopped containers on a host?

#13. You encounter a lock error when running terraform apply. What might resolve it?

#14. Which Kubernetes object should you use to maintain a specified number of pod replicas running?

#15. What happens if a resource is removed from the Terraform configuration?

#16. What does the terraform refresh command do?

#17. How do you define a reusable module in Terraform?

#18. Which command can you use to debug a running Kubernetes pod?

#19. How can you ensure that a pod is scheduled on a specific node?

#20. You notice a pod in the CrashLoopBackOff state. What should you check first?

Leave a Reply Cancel reply

Related Post

Azure Automation: 7 Tips for Efficient Infrastructure as Code (IaC)Azure Automation: 7 Tips for Efficient Infrastructure as Code (IaC)

Quiz – HashiCorp Certified: Terraform Associate 2023Quiz – HashiCorp Certified: Terraform Associate 2023

AWS DevOps (17 Important Services)AWS DevOps (17 Important Services)