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QUESTION: 36

Create a pod with init container which create a file "test.txt" in "workdir" directory. Main container should check a file "test.txt" exists and execute sleep 9999 if the file exists.

Solution:

// create an initial yaml file with this
kubectl run init-cont-pod --image=alpine --restart=Never --dry-run -o

yaml > init-cont-pod.yaml
// edit the yml as below and create it
vim init-cont-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: init-cont-pod
labels:
app: myapp
spec:
volumes:
- name: test-volume
emptyDir: {}
containers:
- name: main-container
image: busybox:1.28
command: ['sh', '-c', 'if [ -f /workdir/test.txt ]; then sleep 9999; fi']
volumeMounts:
- name: test-volume
mountPath: /workdir
initContainers:
- name: init-myservice
image: busybox:1.28
command: ['sh', '-c', "mkdir /workdir; echo >
/workdir/test.txt"]
volumeMounts:
- name: test-volume
mountPath: /workdir
// Create the pod
kubectl apply -f init-cont-pod.yaml
kubectl get pods
// Check Events by doing
kubectl describe po init-cont-pod
Init Containers:
init-myservice:
Container ID:
docker://ebdbf5fad1c95111d9b0e0e2e743c2e347c81b8d4eb5abcccdfe1dd74524 0d4f
Image: busybox:1.28
Image ID: dockerpullable://busybox@sha256:141c253bc4c3fd0a201d32dc1f493bcf3fff003b6df 416dea4f41046e0f37d47
Port: <none>
Host Port: <none>
Command:
sh
-c
mkdir /workdir; echo > /workdir/test.txt

State: Terminated
Reason: Completed

Answer(s): A

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Create a pod with init container which waits for a service called "myservice" to be created. Once init container completes, the myapp-container should start and print a message "The app is running" and sleep for 3600 seconds.

Solution:

vim multi-container-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: myapp-pod
labels:
app: myapp
spec:
containers:
- name: myapp-container
image: busybox:1.28
command: ['sh', '-c', 'echo The app is running! && sleep 3600']
initContainers:
- name: init-myservice
image: busybox:1.28
command: ['sh', '-c', "until nslookup myservice.$(cat /var/run/secrets/kubernetes.io/serviceaccount/namespace).s vc.cluster.local; do echo waiting for myservice; sleep 2; done"]
// Check whether service called "myservice" exists
kubectl get svc
Note: Pod will not start if service called "myservice" doesn't exist.
// Now, Create the pod
kubectl apply -f multi-container-pod.yaml

Answer(s): A

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QUESTION: 38

Create 5 nginx pods in which two of them is labeled env=prod and three of them is labeled env=dev

Solution:

kubectl run nginx-dev1 --image=nginx --restart=Never -- labels=env=dev
kubectl run nginx-dev2 --image=nginx --restart=Never -- labels=env=dev
kubectl run nginx-dev3 --image=nginx --restart=Never -- labels=env=dev
kubectl run nginx-prod1 --image=nginx --restart=Never -- labels=env=prod
kubectl run nginx-prod2 --image=nginx --restart=Never -- labels=env=prod

Answer(s): A

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