CKAD Application Observability and Maintenance Practice Question
Which THREE of the following are valid parameters for configuring probes? (Select 3)
⚠ Common exam trap
The CKAD exam often tests the distinction between valid probe parameters and common-sounding but non-existent fields like `retryIntervalSeconds` or `cooldownSeconds`, tricking candidates into selecting them because they seem logical for retry or cooldown behavior.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
timeoutSeconds
In Kubernetes, probe configuration parameters are defined in the container spec within a Pod. `timeoutSeconds` is a valid parameter that specifies the number of seconds after which the probe times out, defaulting to 1 second if not set. It is used in liveness, readiness, and startup probes to control how long kubelet waits for a probe response before considering it failed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
retryIntervalSeconds
Why it's wrong here
retryIntervalSeconds is not a valid Kubernetes probe parameter. The probe spec (livenessProbe, readinessProbe, startupProbe) has no retry field; instead, the kubelet continuously evaluates probe results across periods, and consecutive failures are handled by failureThreshold. This term resembles retry logic from external tools like Argo Rollouts, but it does not exist in the core API.
- ✓
timeoutSeconds
Why this is correct
timeoutSeconds is a valid Kubernetes probe parameter. It defines the maximum time in seconds that the kubelet waits for a probe to complete after starting it. If the probe exceeds this duration, it is considered failed, and the failure is counted toward failureThreshold. To be effective, timeoutSeconds should be less than periodSeconds to avoid overlapping probe executions.
- ✗
cooldownSeconds
Why it's wrong here
cooldownSeconds is not a valid Kubernetes probe parameter. This is not part of the Probe spec; Kubernetes uses failureThreshold and successThreshold to determine how many consecutive failures or successes are required to change container state. Cooldown is a concept found in autoscalers or other controllers, but it is not a field in the probe configuration.
- ✓
initialDelaySeconds
Why this is correct
initialDelaySeconds is a valid Kubernetes probe parameter. It specifies the number of seconds to wait after the container starts before the first probe is performed. This gives the application time to initialize and become ready, preventing premature liveness failures and restarts during startup. It is especially important for applications with slow startup times.
- ✓
periodSeconds
Why this is correct
periodSeconds is a valid Kubernetes probe parameter. It defines the interval, in seconds, at which the kubelet executes the probe. For instance, a value of 10 means the probe runs every 10 seconds. This parameter works with initialDelaySeconds, timeoutSeconds, and the threshold fields to control the overall probe behavior and health assessment cadence.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CKAD practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKAD exam.