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NEW QUESTION 21
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.
- A. // 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 - B. // 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:
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: A
NEW QUESTION 22
Create a busybox pod that runs the command "env" and save the output to "envpod" file
Answer:
Explanation:
See the solution below.
Explanation
kubectl run busybox --image=busybox --restart=Never --rm -it -- env > envpod.yaml
NEW QUESTION 23
Fix a node that shows as non-ready
- A. Kubectl get nodes
// Check which node shows a not ready
kubectl describe nodes "node-name"
// Login to the node which shows as not ready and check the
systemctl start kubelet / docker
// Verify
ps -auxxww | grep -i "process-name"
kubectl get nodes - B. Kubectl get nodes
// Check which node shows a not ready
kubectl describe nodes "node-name"
// Login to the node which shows as not ready and check the
process for kubelet, docker , kube-proxy.
// systemctl status kubelet (or) ps -aux | grep -i "processname"
// If the process is not started, then start using
systemctl start kubelet / docker
// Verify
ps -auxxww | grep -i "process-name"
kubectl get nodes
Answer: B
NEW QUESTION 24
Change the Image version back to 1.17.1 for the pod you just updated and observe the changes
Answer:
Explanation:
kubectl set image pod/nginx nginx=nginx:1.17.1 kubectl describe po nginx kubectl get po nginx -w # watch it
NEW QUESTION 25
......
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