Exam CKA Topic 2 Question 18 Discussion

Actual exam question for Linux Foundation's CKA exam
Question #: 18
Topic #: 2

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.

A. 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
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 B. 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

Comments

0 Satisfied Customers

0 Shares

0 Demo Downloads

10 Years in Business