Linux Foundation CKA Quiz 13 Topic 8 Questions 61-65

Question: 1

Create a job named ''hello-job'' with the image busybox which echos ''Hello I'm running job''

Akubectl create job hello-job --image=busybox --dry-run -o yaml
-- echo 'Hello I'm running job' > hello-job.yaml
kubectl create -f hello-job.yaml
//Verify Job
kubectl get job
kubectl get po
kubectl logs hello-job-*

Bkubectl create job hello-job --image=busybox --dry-run -o yaml
-- echo 'Hello I'm running job' > hello-job.yaml
kubectl create -f hello-job.yaml
//Verify Job
kubectl get po
kubectl logs hello-job-*

Show Answer

Question: 2

Modify ''hello-job'' and make it run 10 times one after one and 5 times parallelism: 5

Akubectl create job hello-job --image=busybox --dry-run -o yaml
-- echo 'Hello I am from job' > hello-job.yaml
// edit the yaml file to add completions: 16 and
kubectl create -f hello-job.yaml
YAML File:
apiVersion: batch/v1
kind: Job
metadata:
name: hello-job
spec:
completions: 16
parallelism: 5
template:
metadata:
spec:
containers:
- command:
- echo
- Hello I am from job
image: busybox
name: hello-job
restartPolicy: Never

Bkubectl create job hello-job --image=busybox --dry-run -o yaml
-- echo 'Hello I am from job' > hello-job.yaml
// edit the yaml file to add completions: 10 and
kubectl create -f hello-job.yaml
YAML File:
apiVersion: batch/v1
kind: Job
metadata:
name: hello-job
spec:
completions: 10
parallelism: 5
template:
metadata:
spec:
containers:
- command:
- echo
- Hello I am from job
image: busybox
name: hello-job
restartPolicy: Never

Show Answer

Question: 3

Create a Cronjob with busybox image that prints date and hello from kubernetes cluster message for every minute

ACronJob Syntax:
* --> Minute
* --> Hours
* --> Day of The Month
* --> Month
* --> Day of the Week
*/1 * * * * --> Execute a command every one minutes.
vim date-job.yaml
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: date-job
spec:
schedule: '*/1 * * * *'
jobTemplate:
spec:
template:
spec:
containers:
- name: hello
image: busybox
args:
- /bin/sh
- -c
- date; echo Hello from the Kubernetes cluster
restartPolicy: OnFailure
kubectl apply -f date-job.yaml
//Verify
kubectl get cj date-job -o yaml

BCronJob Syntax:
* --> Minute
* --> Hours
* --> Day of The Month
* --> Month
* --> Day of the Week
*/1 * * * * --> Execute a command every one minutes.
vim date-job.yaml
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: date-job
spec:
schedule: '*/1 * * * *'
jobTemplate:
spec:
template:
- /bin/sh
- -c
- date; echo Hello from the Kubernetes cluster
restartPolicy: OnFailure
kubectl apply -f date-job.yaml
//Verify
kubectl get cj date-job -o yaml

Show Answer

Question: 4

Create a daemonset named ''Prometheus-monitoring'' using image=prom/Prometheus which runs in all the nodes in the cluster. Verify the pod running in all the nodes

Avim promo-ds.yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: prometheus-monitoring
spec:
selector:
matchLabels:
name: prometheus
template:
metadata:
labels:
name: prometheus
spec:
tolerations:
# remove it if your masters can't run pods
- key: node-role.kubernetes.io/master
effect: NoSchedule
containers:
- name: prometheus-container
image: prom/prometheus
volumeMounts:
- name: varlog
mountPath: /var/log
- name: varlibdockercontainers
mountPath: /var/lib/docker/containers
readOnly: true
volumes:
- name: varlog
emptyDir: {}
- name: varlibdockercontainers
emptyDir: {}
kubectl apply -f promo-ds.yaml
NOTE: Deamonset will get scheduled to ''default'' namespace, to
schedule deamonset in specific namespace, then add
''namespace'' field in metadata
//Verify
kubectl get ds
NAME DESIRED CURRENT READY UP-TO-DATE
AVAILABLE NODE SELECTOR AGE
prometheus-monitoring 6 6 0 6
0 <none> 7s
kubectl get no # To get list of nodes in the cluster
// There are 6 nodes in the cluster, so a pod gets scheduled to
each node in the cluster

Bvim promo-ds.yaml
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: prometheus-monitoring
spec:
selector:
matchLabels:
name: prometheus
template:
metadata:
labels:
name: prometheus
spec:
tolerations:
# remove it if your masters can't run pods
- key: node-role.kubernetes.io/master
effect: NoSchedule
containers:
- name: prometheus-container
- name: varlibdockercontainers
mountPath: /var/lib/docker/containers
readOnly: true
volumes:
- name: varlog
emptyDir: {}
- name: varlibdockercontainers
emptyDir: {}
kubectl apply -f promo-ds.yaml
NOTE: Deamonset will get scheduled to ''default'' namespace, to
schedule deamonset in specific namespace, then add
''namespace'' field in metadata
//Verify
kubectl get ds
NAME DESIRED CURRENT READY UP-TO-DATE
AVAILABLE NODE SELECTOR AGE
prometheus-monitoring 8 8 0 6
0 <none> 7s
kubectl get no # To get list of nodes in the cluster
// There are 6 nodes in the cluster, so a pod gets scheduled to
each node in the cluster

Show Answer

Question: 5

Create a redis pod, and have it use a non-persistent storage

(volume that lasts for the lifetime of the Pod)

Avim redis-pod-vol.yaml
apiVersion: v1
kind: Pod
metadata:
name: redis
spec:
containers:
- name: redis
image: redis
ports:
- containerPort: 6379
volumeMounts:
- mountPath: /data
name: redis-storage
volumes:
- name: redis-storage
emptyDir: {}
kubectl apply -f redis-pod-vol.yaml

Bvim redis-pod-vol.yaml
apiVersion: v1
kind: Pod
metadata:
name: redis
spec:
containers:
- name: redis
image: redis
ports:
- containerPort: 6679
volumeMounts:
- mountPath: /data
name: redis-storage
volumes:
- name: redis-storage
emptyDir: {}
kubectl apply -f redis-pod-vol.yaml

Show Answer

Linux Foundation CKA Quiz:13 Topic:8 Questions:61-65