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Linux Foundation Certified Kubernetes Administrator (CKA) program is a certification exam designed to test the knowledge of individuals in administering Kubernetes clusters. Kubernetes is an open-source container orchestration system that is used to automate the deployment, scaling, and management of containerized applications. The CKA program is an industry-recognized certification that validates the skills and knowledge of administrators, developers, and architects in working with Kubernetes.
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NEW QUESTION # 71
Create a deployment as follows:
* Name: nginx-app
* Using container nginx with version 1.11.10-alpine
* The deployment should contain 3 replicas
Next, deploy the application with new version 1.11.13-alpine, by performing a rolling update.
Finally, rollback that update to the previous version 1.11.10-alpine.
Answer:
Explanation:
NEW QUESTION # 72
You have a Deployment named 'redis-deployment' running a Redis server. You need to configure Redis with a specific configuration file stored in a ConfigMap named 'redis-config'. The configuration file includes sensitive information like the Redis password. How do you ensure that the sensitive information remains secure while still being accessible to the Redis container?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create the ConfigMap:
- Create a ConfigMap named 'redis-config' containing the Redis configuration file (e.g., 'redis.conf). This configuration file might contain the password as a plain-text value.
- Use 'kubectl create configmap' with the '-from-file' flag:
kubectl create configmap redis-config --from-file=redis.conf
2. Use a Secret for Sensitive Data:
- Create a Secret named 'redis-password' to store the Redis password securely. Use 'kubectl create secret generic' with '--from-literal' kubectl create secret generic redis-password --from-literal=redis-password="your_redis_password"
3. Modify the ConfigMap:
- Modify the 'redis-config' ConfigMap by replacing the plain-text password in the 'redis.conf' with a placeholder or environment variable reference. This is done to prevent the password from being exposed in plain text within the ConfigMap. For example:
kubectl patch configmap redis-config -p '{"data": {"redis.conf': "requirepass ${REDIS PASSWORD}"}}'
4. Configure the Deployment:
- Modify the 'redis-deployment' Deployment to mount both the 'redis-config' ConfigMap and 'redis-password' Secret as volumes in the Pod template.
- Use 'volumeMountS to specify the mount paths and 'volumes' to define the volume sources:
5. Apply the Changes: - Apply the modified Deployment YAML using 'kubectl apply -f redis-deployment.yaml' 6. Verify the Configuration: - Verify that the Redis container is using the secure password from the Secret by accessing the Redis instance and attempting to authenticate.
NEW QUESTION # 73
Create a pod with environment variables as var1=value1.Check the environment variable in pod
Answer: B
NEW QUESTION # 74
You have a pod that uses a PersistentVolumeClaim for its storage. The pod is deleted, but the data on the volume is still present. Explain why the data is not deleted and how you can change this behavior.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
When a pod is deleted, the data on the volume is not automatically deleted by default. This is because the persistentVolumeReclaimPolicy' for the PersistentVolume is set to 'Retain' by default. This policy ensures that the volume is not deleted when the pod is deleted, preserving the data.
To delete the data when the pod is deleted, you need to modify the persistentVolumeReclaimPolicy' to 'Delete'. Here's how:
1. Update the PersistentVolume:
- Update the 'persistentVolumeReclaimPolicy' to 'Delete' in the PersistentVolume definition.
2. Apply the Changes: - Apply the updated PersistentVolume definition using 'kubectl apply -f my-pv.yaml'. Now, when the pod using this PersistentVolume is deleted, the volume and the data will also be deleted automatically.
NEW QUESTION # 75
Create a persistent volume with name app-data, of capacity 2Gi and access mode ReadWriteMany. The type of volume is hostPath and its location is /srv/app-data.
Answer:
Explanation:
Persistent Volume
A persistent volume is a piece of storage in a Kubernetes cluster. PersistentVolumes are a cluster-level resource like nodes, which don't belong to any namespace. It is provisioned by the administrator and has a particular file size. This way, a developer deploying their app on Kubernetes need not know the underlying infrastructure. When the developer needs a certain amount of persistent storage for their application, the system administrator configures the cluster so that they consume the PersistentVolume provisioned in an easy way.
Creating Persistent Volume
kind: PersistentVolume
apiVersion: v1
metadata:
name:app-data
spec:
capacity: # defines the capacity of PV we are creating
storage: 2Gi #the amount of storage we are tying to claim
accessModes: # defines the rights of the volume we are creating
- ReadWriteMany
hostPath:
path: "/srv/app-data" # path to which we are creating the volume
Challenge
* Create a Persistent Volume named app-data, with access mode ReadWriteMany, storage classname shared, 2Gi of storage capacity and the host path /srv/app-data.
2. Save the file and create the persistent volume.
Image for post
3. View the persistent volume.
* Our persistent volume status is available meaning it is available and it has not been mounted yet. This status will change when we mount the persistentVolume to a persistentVolumeClaim.
PersistentVolumeClaim
In a real ecosystem, a system admin will create the PersistentVolume then a developer will create a PersistentVolumeClaim which will be referenced in a pod. A PersistentVolumeClaim is created by specifying the minimum size and the access mode they require from the persistentVolume.
Challenge
* Create a Persistent Volume Claim that requests the Persistent Volume we had created above. The claim should request 2Gi. Ensure that the Persistent Volume Claim has the same storageClassName as the persistentVolume you had previously created.
kind: PersistentVolume
apiVersion: v1
metadata:
name:app-data
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 2Gi
storageClassName: shared
2. Save and create the pvc
njerry191@cloudshell:~ (extreme-clone-2654111)$ kubect1 create -f app-data.yaml persistentvolumeclaim/app-data created
3. View the pvc
Image for post
4. Let's see what has changed in the pv we had initially created.
Image for post
Our status has now changed from available to bound.
5. Create a new pod named myapp with image nginx that will be used to Mount the Persistent Volume Claim with the path /var/app/config.
Mounting a Claim
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: null
name: app-data
spec:
volumes:
- name:congigpvc
persistenVolumeClaim:
claimName: app-data
containers:
- image: nginx
name: app
volumeMounts:
- mountPath: "/srv/app-data "
name: configpvc
NEW QUESTION # 76
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