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NEW QUESTION 47
Exhibit:

Context
A pod is running on the cluster but it is not responding.
Task
The desired behavior is to have Kubemetes restart the pod when an endpoint returns an HTTP 500 on the /healthz endpoint. The service, probe-pod, should never send traffic to the pod while it is failing. Please complete the following:
* The application has an endpoint, /started, that will indicate if it can accept traffic by returning an HTTP 200. If the endpoint returns an HTTP 500, the application has not yet finished initialization.
* The application has another endpoint /healthz that will indicate if the application is still working as expected by returning an HTTP 200. If the endpoint returns an HTTP 500 the application is no longer responsive.
* Configure the probe-pod pod provided to use these endpoints
* The probes should use port 8080

• A. Solution:
  
  In the configuration file, you can see that the Pod has a single Container. The periodSeconds field specifies that the kubelet should perform a liveness probe every 5 seconds. The initialDelaySeconds field tells the kubelet that it should wait 5 seconds before performing the first probe. To perform a probe, the kubelet executes the command cat /tmp/healthy in the target container. If the command succeeds, it returns 0, and the kubelet considers the container to be alive and healthy. If the command returns a non-zero value, the kubelet kills the container and restarts it.
  When the container starts, it executes this command:
  /bin/sh -c "touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600"
  For the first 30 seconds of the container's life, there is a /tmp/healthy file. So during the first 30 seconds, the command cat /tmp/healthy returns a success code. After 30 seconds, cat /tmp/healthy returns a failure code.
  Create the Pod:
  kubectl apply -f https://k8s.io/examples/pods/probe/exec-liveness.yaml
  Within 30 seconds, view the Pod events:
  kubectl describe pod liveness-exec
  The output indicates that no liveness probes have failed yet:
  FirstSeen LastSeen Count From SubobjectPath Type Reason Message
  --------- -------- ----- ---- ------------- -------- ------ -------
  24s 24s 1 {default-scheduler } Normal Scheduled Successfully assigned liveness-exec to worker0
  23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Pulling pulling image "k8s.gcr.io/busybox"
  23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Pulled Successfully pulled image "k8s.gcr.io/busybox"
  23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Created Created container with docker id 86849c15382e; Security:[seccomp=unconfined]
  23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Started Started container with docker id 86849c15382e
  After 35 seconds, view the Pod events again:
  kubectl describe pod liveness-exec
  At the bottom of the output, there are messages indicating that the liveness probes have failed, and the containers have been killed and recreated.
  FirstSeen LastSeen Count From SubobjectPath Type Reason Message
  --------- -------- ----- ---- ------------- -------- ------ -------
  37s 37s 1 {default-scheduler } Normal Scheduled Successfully assigned liveness-exec to worker0
  36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Pulling pulling image "k8s.gcr.io/busybox"
  36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Pulled Successfully pulled image "k8s.gcr.io/busybox"
  36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Created Created container with docker id 86849c15382e; Security:[seccomp=unconfined]
  36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Started Started container with docker id 86849c15382e
  2s 2s 1 {kubelet worker0} spec.containers{liveness} Warning Unhealthy Liveness probe failed: cat: can't open '/tmp/healthy': No such file or directory
  Wait another 30 seconds, and verify that the container has been restarted:
  kubectl get pod liveness-exec
  The output shows that RESTARTS has been incremented:
  NAME READY STATUS RESTARTS AGE
  liveness-exec 1/1 Running 1 1m
• B. Solution:
  
  In the configuration file, you can see that the Pod has a single Container. The periodSeconds field specifies that the kubelet should perform a liveness probe every 5 seconds. The initialDelaySeconds field tells the kubelet that it should wait 5 seconds before performing the first probe. To perform a probe, the kubelet executes the command cat /tmp/healthy in the target container. If the command succeeds, it returns 0, and the kubelet considers the container to be alive and healthy. If the command returns a non-zero value, the kubelet kills the container and restarts it.
  When the container starts, it executes this command:
  /bin/sh -c "touch /tmp/healthy; sleep 30; rm -rf /tmp/healthy; sleep 600"
  For the first 30 seconds of the container's life, there is a /tmp/healthy file. So during the first 30 seconds, the command cat /tmp/healthy returns a success code. After 30 seconds, cat /tmp/healthy returns a failure code.
  Create the Pod:
  kubectl apply -f https://k8s.io/examples/pods/probe/exec-liveness.yaml
  Within 30 seconds, view the Pod events:
  kubectl describe pod liveness-exec
  The output indicates that no liveness probes have failed yet:
  FirstSeen LastSeen Count From SubobjectPath Type Reason Message
  --------- -------- ----- ---- ------------- -------- ------ -------
  24s 24s 1 {default-scheduler } Normal Scheduled Successfully assigned liveness-exec to worker0
  23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Pulling pulling image "k8s.gcr.io/busybox"
  23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Pulled Successfully pulled image "k8s.gcr.io/busybox"
  23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Created Created container with docker id 86849c15382e; Security:[seccomp=unconfined]
  23s 23s 1 {kubelet worker0} spec.containers{liveness} Normal Started Started container with docker id 86849c15382e
  After 35 seconds, view the Pod events again:
  kubectl describe pod liveness-exec
  At the bottom of the output, there are messages indicating that the liveness probes have failed, and the containers have been killed and recreated.
  FirstSeen LastSeen Count From SubobjectPath Type Reason Message
  --------- -------- ----- ---- ------------- -------- ------ -------
  37s 37s 1 {default-scheduler } Normal Scheduled Successfully assigned liveness-exec to worker0
  36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Pulling pulling image "k8s.gcr.io/busybox"
  36s 36s 1 {kubelet worker0} spec.containers{liveness} Normal Pulled Successfully
  2s 2s 1 {kubelet worker0} spec.containers{liveness} Warning Unhealthy Liveness probe failed: cat: can't open '/tmp/healthy': No such file or directory
  Wait another 30 seconds, and verify that the container has been restarted:
  kubectl get pod liveness-exec
  The output shows that RESTARTS has been incremented:
  NAME READY STATUS RESTARTS AGE
  liveness-exec 1/1 Running 1 1m

Answer: A

NEW QUESTION 48
Context

Task
A Deployment named backend-deployment in namespace staging runs a web application on port 8081.

Answer:

Explanation:
Solution:

NEW QUESTION 49
Context

Task:
Update the Deployment app-1 in the frontend namespace to use the existing ServiceAccount app.

Answer:

Explanation:
Solution:

NEW QUESTION 50
Exhibit:

Task
A deployment is falling on the cluster due to an incorrect image being specified. Locate the deployment, and fix the problem.

• A. Pending

Answer: A

NEW QUESTION 51
Context

Task:
Update the Pod ckad00018-newpod in the ckad00018 namespace to use a NetworkPolicy allowing the Pod to send and receive traffic only to and from the pods web and db

Answer:

Explanation:
Solution:

NEW QUESTION 52
......

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