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Understanding of functional and technical aspects of Troubleshooting
Detect, diagnose, and remedy a variety of Kubernetes failures at the network, node, control-plane, and application levels. You will use tools included in Kubernetes, such as kubectl, as well as a variety of Linux operating system tools like systemctl, journalctl, ss, and openssl to build a comprehensive Kubernetes troubleshooting toolkit.
The following will be discussed in CNCF CKA dumps:
- Troubleshoot Kubernetes node failures
- Troubleshoot cluster component failure
- Troubleshoot Kubernetes application failures
- Troubleshoot Kubernetes connection failures
- Understand how to monitor applications
- Troubleshoot networking
- Troubleshoot Kubernetes component failures
- Evaluate cluster and node logging
NEW QUESTION 26
Given a partially-functioningKubernetes cluster, identifysymptoms of failure on the cluster.
Determine the node, the failingservice, and take actions to bring upthe failed service and restore thehealth of the cluster. Ensure that anychanges are made permanently.
You cansshto the relevant Inodes (bk8s-master-0orbk8s-node-0) using:
[student@node-1] $ ssh<nodename>
You can assume elevatedprivileges on any node in thecluster with the followingcommand:
[student@nodename] $ | sudo -i
Answer:
Explanation:
See the solution below.
Explanation
solution
NEW QUESTION 27
Create a deployment as follows:
* Name:nginx-app
* Using containernginxwithversion 1.11.10-alpine
* The deployment should contain3replicas
Next, deploy the application with newversion1.11.13-alpine, byperforming a rolling update.
Finally, rollback that update to theprevious version1.11.10-alpine.
Answer:
Explanation:
See the solution below.
Explanation
solution
NEW QUESTION 28
Check to see how many worker nodes are ready (not including nodes taintedNoSchedule) and write the number to/opt/KUCC00104/kucc00104.txt.
Answer:
Explanation:
See the solution below.
Explanation
solution
NEW QUESTION 29
Deployment
a. Create a deployment of webapp with image nginx:1.17.1 with
container port 80 and verify the image version
- A. // Create initial YAML file with -dry-run option
kubectl create deploy webapp --image=nginx:1.17.1 --dryrun=client -o yaml > webapp.yaml vim webapp.yaml apiVersion: apps/v1 kind: Deployment metadata:
labels:
app: webapp
name: webapp
spec: replicas: 1 containers: - image: nginx:1.17.1 name: nginx kubectl create -f webapp.yaml -record=true //Verify Image Version kubectl describe deploy webapp | grep -i "Image" Using JsonPath kubectl get deploy -o=jsonpath='{range.items [*]}{.[*]} {.metadata.name}{"\t"}{.spec.template.spec.containers[*].i mage}{"\n"}' - B. // Create initial YAML file with -dry-run option
kubectl create deploy webapp --image=nginx:1.17.1 --dryrun=client -o yaml > webapp.yaml vim webapp.yaml apiVersion: apps/v1 kind: Deployment metadata:
labels:
app: webapp
name: webapp
spec: replicas: 1 selector: matchLabels: app: webapp template: metadata: labels: app: webapp spec: containers: - image: nginx:1.17.1 name: nginx kubectl create -f webapp.yaml -record=true //Verify Image Version kubectl describe deploy webapp | grep -i "Image" Using JsonPath kubectl get deploy -o=jsonpath='{range.items [*]}{.[*]} {.metadata.name}{"\t"}{.spec.template.spec.containers[*].i mage}{"\n"}'
Answer: B
NEW QUESTION 30
Get list of all the pods showing name and namespace with a jsonpath expression.
Answer:
Explanation:
kubectl get pods -o=jsonpath="{.items[*]['metadata.name' , 'metadata.namespace']}"
NEW QUESTION 31
Create and configure the service front-end-service so it's accessible through NodePort and routes to the existing pod named front-end.
Answer:
Explanation:
See the solution below.
Explanation
solution
F:\Work\Data Entry Work\Data Entry\20200827\CKA\8 B.JPG
NEW QUESTION 32
Create a nginx pod that will be deployed to node with the label
"gpu=true"
- A. kubectl run nginx --image=nginx --restart=Always --dry-run -o
yaml > nodeselector-pod.yaml
// add the nodeSelector like below and create the pod
kubectl apply -f nodeselector-pod.yaml
vim nodeselector-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx
spec:
nodeSelector:
gpu: true
containers:
- image: nginx
name: nginx
restartPolicy: Always
kubectl apply -f nodeselector-pod.yaml
//Verify
kubectl get no -show-labels
kubectl get po
kubectl describe po nginx | grep Node-Selectors - B. kubectl run nginx --image=nginx --restart=Always --dry-run -o
yaml > nodeselector-pod.yaml
// add the nodeSelector like below and create the pod
kubectl apply -f nodeselector-pod.yaml
vim nodeselector-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: nginx
spec:
nodeSelector:
gpu: true
yaml
//Verify
kubectl get no -show-labels
kubectl get po
kubectl describe po nginx | grep Node-Selectors
Answer: A
NEW QUESTION 33
Create a snapshot of the etcd instance running at https://127.0.0.1:2379, saving the snapshot to the file path
/srv/data/etcd-snapshot.db.
The following TLS certificates/key are supplied for connecting to the server with etcdctl:
* CA certificate: /opt/KUCM00302/ca.crt
* Client certificate: /opt/KUCM00302/etcd-client.crt
* Client key: Topt/KUCM00302/etcd-client.key
Answer:
Explanation:
See the solution below.
Explanation
solution
NEW QUESTION 34
List all the pods sorted by name
Answer:
Explanation:
See the solution below.
Explanation
kubectl get pods --sort-by=.metadata.name
NEW QUESTION 35
Create a nginx pod with label env=test in engineering namespace
Answer:
Explanation:
See the solution below.
Explanation
kubectl run nginx --image=nginx --restart=Never --labels=env=test --namespace=engineering --dry-run -o yaml > nginx-pod.yaml kubectl run nginx --image=nginx --restart=Never --labels=env=test --namespace=engineering --dry-run -o yaml | kubectl create -nengineering-f - YAML File:
apiVersion: v1
kind: Pod
metadata:
name: nginx
namespace: engineering
labels:
env: test
spec:
containers:
- name: nginx
image: nginx
imagePullPolicy: IfNotPresent
restartPolicy: Never
kubectl create -f nginx-pod.yaml
NEW QUESTION 36
Set the node namedek8s-node-1asunavailable and reschedule all thepods running on it.
Answer:
Explanation:
See the solution below.
Explanation
solution
NEW QUESTION 37
Annotate the pod with name=webapp
- A. kubectl annotate pod nginx-dev-pod name=webapp
kubectl annotate pod nginx-prod-pod name=webapp
// Verify
kubectl describe po nginx-dev-pod | grep -i annotations - B. kubectl annotate pod nginx-dev-pod name=webapp
kubectl annotate pod nginx-prod-pod name=webapp
// Verify
kubectl describe po nginx-dev-pod | grep -i annotations
kubectl describe po nginx-prod-pod | grep -i annotations
Answer: B
NEW QUESTION 38
Create PersistentVolume named task-pv-volume with storage 10Gi, access modes ReadWriteMany, storageClassName manual, and volume at /mnt/data and Create a PersistentVolumeClaim of at least 3Gi storage and access mode ReadWriteOnce and verify
- A. vim task-pv-volume.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: task-pv-volume
labels:
type: local
spec:
storageClassName: manual
capacity:
storage: 10Gi
accessModes:
- ReadWriteMany
hostPath:
path: "/mnt/data"
kubectl apply -f task-pv-volume.yaml
//Verify
kubectl get pv
vim task-pvc-volume.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: task-pv-claim
spec:
storageClassName: manual
accessModes:
- ReadWriteMany
resources:
requests:
storage: 3Gi
kubectl apply -f task-pvc-volume.yaml
//Verify
Kuk kubectl get pvc - B. vim task-pv-volume.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
name: task-pv-volume
labels:
type: local
spec:
storageClassName: manual
capacity:
storage: 10Gi
accessModes:
- ReadWriteMany
hostPath:
path: "/mnt/data"
kubectl apply -f task-pv-volume.yaml
//Verify
kubectl get pv
vim task-pvc-volume.yaml
apiVersion: v1
- ReadWriteMany
resources:
requests:
storage: 3Gi
kubectl apply -f task-pvc-volume.yaml
//Verify
Kuk kubectl get pvc
Answer: A
NEW QUESTION 39
Create a deployment named "myapp" that having 2 replicas with
nginx image and expose deployment as service named "myservice"
- A. // Create a YAML Template
kubectl create deploy myapp --image=nginx --dry-run -o yaml >
myapp.yaml
//Update replicas=2 in myapp.yaml file
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: myapp
name: myapp
spec:
replicas: 2
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
- image: nginx
name: nginx
// Create deployment
kubectl create -f myapp.yaml
// Creating YAML template for service
kubectl expose deployment myapp --type=ClusterIP --port=80 --
target-port=80 --name=myservice --dry-run -o yaml >
myservice.yaml
YAML File:
apiVersion: v1
kind: Service
metadata:
labels:
app: myapp
name: myservice
spec:
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
app: myapp
type: ClusterIP
kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S)
AGE
kubernetes ClusterIP 10.2.0.1 <none> 443/TCP
158d
myservice ClusterIP 10.2.96.175 <none> 80/TCP
40s - B. // Create a YAML Template
kubectl create deploy myapp --image=nginx --dry-run -o yaml >
myapp.yaml
//Update replicas=2 in myapp.yaml file
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: myapp
name: myapp
spec:
replicas: 2
selector:
matchLabels:
app: myapp
template:
metadata:
labels:
app: myapp
spec:
containers:
- image: nginx
name: nginx
// Create deployment
kubectl create -f myapp.yaml
// Creating YAML template for service
kubectl expose deployment myapp --type=ClusterIP --port=60 --
target-port=60 --name=myservice --dry-run -o yaml >
myservice.yaml
YAML File:
apiVersion: v1
kind: Service
metadata:
labels:
app: myapp
name: myservice
spec:
ports:
- port: 60
protocol: TCP
targetPort: 80
selector:
app: myapp
type: ClusterIP
kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S)
AGE
kubernetes ClusterIP 10.2.0.1 <none> 443/TCP
158d
myservice ClusterIP 10.2.96.175 <none> 80/TCP
40s
Answer: A
NEW QUESTION 40
Deploy a pod with image=redis on a node with label disktype=ssd
- A. // Get list of nodes
kubectl get nodes
//Get node with the label disktype=ssd
kubectl get no -l disktype=ssd
// Create a sample yaml file
kubectl run node-redis --generator=run-pod/v1 --image=redis --dry
run -o yaml > test-redis.yaml
// Edit test-redis.yaml file and add nodeSelector
vim test-redis.yaml
apiVersion: v1
kind: Pod
metadata:
name: redis
spec:
nodeSelector:
disktype: ssd
containers:
- name: node-redis
image: redis
imagePullPolicy: IfNotPresent
kubectl apply -f test-redis.yaml
/ // Verify
K kubectl get po -o wide - B. // Get list of nodes
kubectl get nodes
//Get node with the label disktype=ssd
kubectl get no -l disktype=ssd
// Create a sample yaml file
kubectl run node-redis --generator=run-pod/v1 --image=redis --dry
run -o yaml > test-redis.yaml
// Edit test-redis.yaml file and add nodeSelector
vim test-redis.yaml
apiVersion: v1
- name: node-redis
image: redis
imagePullPolicy: IfNotPresent
kubectl apply -f test-redis.yaml
/ // Verify
K kubectl get po -o wide
Answer: A
NEW QUESTION 41
......
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