Quiz Module 7 - Advanced Workloads

Instructions

This quiz contains 30 multiple-choice questions.

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Question 1

What type of workload ensures that a Pod runs on all nodes in the cluster?

1. Deployment

2. DaemonSet

3. StatefulSet

See explanation

Correct answer: DaemonSet

Explanation: A DaemonSet ensures that a Pod runs on all (or some) nodes in the cluster, ideal for logging or monitoring agents.

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Question 2

What is a Job in Kubernetes?

1. A type of Deployment

2. A workload that creates one or more Pods and ensures that a certain number successfully complete

3. A type of Service

4. A type of volume

See explanation

Correct answer: A workload that creates one or more Pods and ensures that a certain number successfully complete

Explanation: A Job is used for one-time tasks that need to run once and complete successfully, such as data processing or backups.

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Question 3

What is a CronJob?

1. A type of Job

2. A workload that creates Jobs on a recurring basis according to a schedule (like cron)

3. A type of Deployment

4. A type of Service

See explanation

Correct answer: A workload that creates Jobs on a recurring basis according to a schedule (like cron)

Explanation: A CronJob schedules the execution of Jobs according to a cron format (e.g., "0 2 * * *" for every day at 2 AM).

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Question 4

What is the main difference between a StatefulSet and a Deployment?

1. No difference

2. StatefulSet ensures stable identities and individual persistent storage, Deployment is for stateless applications

3. Deployment is for stateful applications

4. StatefulSet is for stateless applications

See explanation

Correct answer: StatefulSet ensures stable identities and individual persistent storage, Deployment is for stateless applications

Explanation: StatefulSets are designed for stateful applications (databases) with stable identities, while Deployments are for stateless applications.

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Question 5

What is the schedule format of a CronJob?

1. HH:MM

2. Cron format: minute hour day month day-of-week

3. ISO 8601 format

4. Unix timestamp format

See explanation

Correct answer: Cron format: minute hour day month day-of-week

Explanation: The schedule uses the standard cron format: "* * * * *" where each asterisk represents minute, hour, day of the month, month, day of the week.

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Question 6

What is a DaemonSet used for?

1. Deploying web applications

2. Deploying system agents like logging, monitoring, or networking agents on each node

3. Deploying databases

4. Deploying Services

See explanation

Correct answer: Deploying system agents like logging, monitoring, or networking agents on each node

Explanation: DaemonSets are ideal for agents that need to run on each node, such as Fluentd for logs, Prometheus Node Exporter for metrics, or kube-proxy.

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Question 7

What is the difference between completions and parallelism in a Job?

1. No difference

2. completions defines the number of successes required, parallelism defines the number of Pods running in parallel

3. parallelism defines successes, completions defines Pods

4. They are identical

See explanation

Correct answer: completions defines the number of successes required, parallelism defines the number of Pods running in parallel

Explanation: completions specifies how many Pods must successfully complete, while parallelism controls how many Pods can run simultaneously.

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Question 8

What is a headless service in the context of a StatefulSet?

1. A Service without an IP

2. A Service with clusterIP: None that directly returns the IPs of the Pods for stable DNS discovery

3. A deprecated Service

4. A Service without Pods

See explanation

Correct answer: A Service with clusterIP: None that directly returns the IPs of the Pods for stable DNS discovery

Explanation: StatefulSets use headless services to allow stable DNS discovery of each Pod (e.g., web-0.web-service.default.svc.cluster.local).

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Question 9

What is the command to view Jobs?

1. kubectl get pods

2. kubectl get jobs

3. kubectl get tasks

4. kubectl list jobs

See explanation

Correct answer: kubectl get jobs

Explanation: kubectl get jobs displays all Jobs and their status (Active, Completed, Failed).

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Question 10

What is the command to view CronJobs?

1. kubectl get jobs

2. kubectl get cronjobs

3. kubectl get scheduled

4. kubectl list cronjobs

See explanation

Correct answer: kubectl get cronjobs

Explanation: kubectl get cronjobs (or cj) displays all CronJobs and their schedule.

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Question 11

What is a Pod Disruption Budget (PDB)?

1. A budget for resources

2. A policy that limits the number of Pods of an application that can be disrupted simultaneously

3. A deployment quota

4. A scaling limit

See explanation

Correct answer: A policy that limits the number of Pods of an application that can be disrupted simultaneously

Explanation: A PDB ensures that a certain number of Pods remain available during updates or maintenance, ensuring high availability.

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Question 12

What is the difference between a Job and a CronJob?

1. No difference

2. A Job runs once, a CronJob creates recurring Jobs according to a schedule

3. A CronJob runs once

4. A Job is recurring

See explanation

Correct answer: A Job runs once, a CronJob creates recurring Jobs according to a schedule

Explanation: A Job executes a one-time task, while a CronJob schedules the recurring execution of Jobs according to a cron schedule.

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Question 13

What is the default restartPolicy for a Job?

1. Always

2. Never or OnFailure

3. OnSuccess

4. Never only

See explanation

Correct answer: Never or OnFailure

Explanation: Jobs typically use restartPolicy: Never or OnFailure, as they need to complete successfully, not restart indefinitely.

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Question 14

What is a StatefulSet used for?

1. Stateless applications

2. Stateful applications like databases, requiring stable identities and persistent storage

3. Simple web applications

4. Network services

See explanation

Correct answer: Stateful applications like databases, requiring stable identities and persistent storage

Explanation: StatefulSets are designed for applications that require stable identities, guaranteed deployment order, and individual persistent storage per Pod.

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Question 15

What is the command to suspend a CronJob?

1. kubectl stop cronjob

2. kubectl patch cronjob [name] -p '{"spec":{"suspend":true}}'

3. kubectl delete cronjob

4. kubectl pause cronjob

See explanation

Correct answer: kubectl patch cronjob [name] -p '{"spec":{"suspend":true}}'

Explanation: To suspend a CronJob, use kubectl patch to set suspend: true, which prevents new Jobs from being created.

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Question 16

What is a DaemonSet with nodeSelector?

1. A DaemonSet on all nodes

2. A DaemonSet that runs only on nodes matching the specified selectors

3. A deprecated DaemonSet

4. A DaemonSet without Pods

See explanation

Correct answer: A DaemonSet that runs only on nodes matching the specified selectors

Explanation: A DaemonSet can use nodeSelector to limit execution to certain nodes, useful for agents specific to certain types of nodes.

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Question 17

What is the difference between a Job with completions=1 and parallelism=1?

1. No difference

2. completions=1 means one Pod must succeed, parallelism=1 means only one Pod runs at a time

3. They are identical

4. completions controls Pods, parallelism controls successes

See explanation

Correct answer: completions=1 means one Pod must succeed, parallelism=1 means only one Pod runs at a time

Explanation: completions defines the number of successes required, while parallelism controls the number of Pods that can run simultaneously.

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Question 18

What is a StatefulSet with serviceName?

1. A StatefulSet without a Service

2. A StatefulSet that uses a specified headless service for stable DNS discovery

3. A StatefulSet with a normal Service

4. A deprecated StatefulSet

See explanation

Correct answer: A StatefulSet that uses a specified headless service for stable DNS discovery

Explanation: serviceName in a StatefulSet references a headless service that allows stable DNS discovery of each Pod in the StatefulSet.

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Question 19

What is the command to view DaemonSets?

1. kubectl get pods

2. kubectl get daemonsets

3. kubectl get agents

4. kubectl list daemonsets

See explanation

Correct answer: kubectl get daemonsets

Explanation: kubectl get daemonsets (or ds) displays all DaemonSets and the desired/current number of Pods.

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Question 20

What is the command to view StatefulSets?

1. kubectl get pods

2. kubectl get statefulsets

3. kubectl get stateful

4. kubectl list statefulsets

See explanation

Correct answer: kubectl get statefulsets

Explanation: kubectl get statefulsets (or sts) displays all StatefulSets and their replication status.

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Question 21

What is a Job with activeDeadlineSeconds?

1. A Job without a time limit

2. A Job with a maximum time limit for its execution

3. A Job with a resource limit

4. A deprecated Job

See explanation

Correct answer: A Job with a maximum time limit for its execution

Explanation: activeDeadlineSeconds defines the maximum duration in seconds that a Job can run before being automatically terminated.

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Question 22

What is the difference between a DaemonSet and a Deployment for scaling?

1. No difference

2. A DaemonSet creates one Pod per node, a Deployment creates a specified number of Pods

3. A Deployment creates one Pod per node

4. A DaemonSet creates a specified number of Pods

See explanation

Correct answer: A DaemonSet creates one Pod per node, a Deployment creates a specified number of Pods

Explanation: A DaemonSet ensures that a Pod runs on each node (or nodes matching selectors), while a Deployment creates a specified number of replicas regardless of the number of nodes.

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Question 23

What is a CronJob with startingDeadlineSeconds?

1. A CronJob without a limit

2. A CronJob with a time limit to start a Job after the scheduled time

3. A CronJob with a resource limit

4. A deprecated CronJob

See explanation

Correct answer: A CronJob with a time limit to start a Job after the scheduled time

Explanation: startingDeadlineSeconds defines the number of seconds after the scheduled time during which a Job can still be started before being considered missed.

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Question 24

What is the command to delete a Job and its Pods?

1. kubectl remove job

2. kubectl delete job [name]

3. kubectl stop job

4. kubectl drop job

See explanation

Correct answer: kubectl delete job [name]

Explanation: kubectl delete job deletes the Job and its associated Pods. Use --cascade=orphan to keep the Pods.

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Question 25

What is a StatefulSet with podManagementPolicy: Parallel?

1. A StatefulSet that creates Pods sequentially

2. A StatefulSet that creates and deletes Pods in parallel instead of sequentially

3. A deprecated StatefulSet

4. A StatefulSet without Pods

See explanation

Correct answer: A StatefulSet that creates and deletes Pods in parallel instead of sequentially

Explanation: By default, StatefulSets create/delete Pods sequentially. Parallel allows this to be done in parallel, speeding up operations but losing guaranteed order.

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Question 26

What is the command to view the history of a CronJob?

1. kubectl get jobs

2. kubectl get jobs -l job-name=[cronjob-name] to see the Jobs created by the CronJob

3. kubectl history cronjob

4. kubectl logs cronjob

See explanation

Correct answer: kubectl get jobs -l job-name=[cronjob-name] to see the Jobs created by the CronJob

Explanation: CronJobs create Jobs with specific labels. Use kubectl get jobs with the appropriate labels to view the history.

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Question 27

What is a Job with backoffLimit?

1. A Job without a retry limit

2. A Job with a maximum number of attempts before being marked as failed

3. A Job with a resource limit

4. A deprecated Job

See explanation

Correct answer: A Job with a maximum number of attempts before being marked as failed

Explanation: backoffLimit defines the maximum number of times a Job can be retried after a failure before being marked as permanently failed.

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Question 28

What is the difference between a StatefulSet and a DaemonSet?

1. No difference

2. StatefulSet creates a specified number of Pods with stable identities, DaemonSet creates one Pod per node

3. DaemonSet creates a specified number of Pods

4. StatefulSet creates one Pod per node

See explanation

Correct answer: StatefulSet creates a specified number of Pods with stable identities, DaemonSet creates one Pod per node

Explanation: StatefulSets create a specified number of replicas with stable identities, while DaemonSets ensure one Pod on each node.

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Question 29

What is a CronJob with concurrencyPolicy: Forbid?

1. A CronJob that allows multiple simultaneous Jobs

2. A CronJob that prevents a new Job from being created if the previous one is still running

3. A deprecated CronJob

4. A CronJob without a limit

See explanation

Correct answer: A CronJob that prevents a new Job from being created if the previous one is still running

Explanation: concurrencyPolicy: Forbid prevents a new Job from being created if the previous Job is still running, avoiding simultaneous executions.

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Question 30

What is the command to view the Pods of a DaemonSet?

1. kubectl get pods --daemonset

2. kubectl get pods -l [selector] where selector corresponds to the DaemonSet's labels

3. kubectl get daemonpods

4. kubectl list daemonpods

See explanation

Correct answer: kubectl get pods -l [selector] where selector corresponds to the DaemonSet's labels

Explanation: Pods created by a DaemonSet have the same labels as the DaemonSet. Use kubectl get pods with the appropriate labels to filter them.

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Quiz Result

Congratulations on completing the Module 7 quiz!

Score:

• 25-30 correct answers: Excellent! You master advanced workloads.
• 20-24 correct answers: Very good! Review the concepts where you had difficulties.
• 15-19 correct answers: Good! Review the chapters on StatefulSets, DaemonSets, Jobs, and CronJobs.
• Less than 15: Recommended to review the module before continuing.

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Quiz created on: December 2024