DevOps Quiz

In a multi-stage Docker build, what is the primary advantage of separating build stages, and how does this impact the final container image size?

• It improves build speed

• It reduces the final image size by excluding unnecessary build dependencies

• It allows parallel processing of build stages

• It provides better security isolation

Which Dockerfile instruction is used to set default environment variables that can be overridden at runtime, and how does it differ from the ARG instruction?

• LABEL

• ENV

• ARG

• WORKDIR

In Kubernetes, what is the key difference between a Deployment and a ReplicaSet?

• Deployments cannot scale, while ReplicaSets can

• Deployments manage ReplicaSets and provide declarative updates

• ReplicaSets are responsible for network routing

• Deployments only work with stateless applications

When using Docker Compose, what does the depends_on directive accomplish in a multi-service configuration?

• It ensures a specific startup order for services

• It automatically scales services

• It creates network connections between services

• It defines resource limits for services

In the context of Kubernetes, what is the primary responsibility of the kube-proxy component?

• Container image management

• Managing network connectivity and load balancing for Pods

• Scheduling Pods across nodes

• Monitoring node health

What security best practice is demonstrated by the USER instruction in a Dockerfile?

• Encrypting container contents

• Preventing network access

• Running containers with non-root privileges

• Limiting container resources

In a Kubernetes Service of type LoadBalancer, what happens when the service is created?

• It automatically creates a cluster-internal IP

• It provisions an external load balancer in the cloud provider

• It exposes the service on every node's IP

• It creates a DNS entry for the service

What is the significance of the HEALTHCHECK instruction in a Dockerfile?

• It prevents container deployment

• It adds a mechanism to check container health

• It increases container performance

• It manages container networking

In Kubernetes, what distinguishes a ConfigMap from a Secret?

• ConfigMaps can store binary data; Secrets cannot

• Secrets are base64 encoded and used for sensitive information

• ConfigMaps can only be used with specific types of applications

• Secrets automatically rotate credentials

What is the purpose of the etcd component in the Kubernetes control plane?

• Managing container runtime

• Storing cluster configuration and state

• Load balancing network traffic

• Scheduling Pods across nodes