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You have a Deployment for a web application named 'web-app-deployment' that uses an image named 'web-app:vl .0'. You want to implement a rolling update to upgrade the deployment to a new version, 'web-app:v2.0', but only allow a maximum of 2 pods to be unavailable at any time during the update. How would you achieve this using Kubernetes? Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Update the Deployment YAML:
- Open the Deployment YAML file for 'web-app-deployment' (e.g., 'web-app-deployment.yaml').
- Modify the 'image' field within the 'spec.template.spec.containers' section to the new image: 'web-app:v2.0'.
- Adjust the 'strategy.rollingUpdate' section to control the rolling update process:
- Set 'maxUnavailable: 2' to allow a maximum of 2 pods to be unavailable at any time.
- Keep 'maxSurge: 0' if you don't want additional pods to be created during the update.
2. Apply the Updated Deployment: - IJse 'kubectl apply -f web-app-deployment.yaml' to apply the updated Deployment YAML. 3. Monitor the Rolling Update: - Use 'kubectl get pods -l app=web-app' to monitor the update process. You will see that Kubernetes will gradually terminate old pods running 'web-app:vl .0' and create new pods with 'web-app:v2.0'. - You can also use "kubectl describe deployment web-app-deployment' to observe the progress of the rolling update. 4. Verify Successful Update: - Once the update is complete, confirm that all pods are running the new image 'web-app:v2.0'. You can check the output of 'kubectl get pods -l app=web-app' or 'kubectl describe deployment web-app-deployment'.
NEW QUESTION # 15
You have a 'NodePort' service named 'my-service' exposed on port 30000. You need to configure a NetworkPolicy to only allow access to the service from specific nodes in the cluster based on their node labels. Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a NetworkPolicy:
- Define a NetworkPolicy that allows traffic from nodes with specific labels to the service.
2. Apply the NetworkPolicy: - Apply the YAML file using 'kubectl apply -f networkpolicy.yaml'. 3. Verify the NetworkPolicy: - Check the status of the NetworkPolicy using 'kubectl get networkpolicies allow-specific-nodes -n . 4. Test: - Access the service using the 'NodePort' on a node with the specified label. You should be able to access the service. - Access the service using the 'NodePort' on a node that does not have the specified label. You should not be able to access the service. Note: - Replace with the actual namespace where your service is located. - Replace the CIDR values with the actual CIDRs of your nodes or the node labels that you want to use for filtering.,
NEW QUESTION # 16
Create a pod that having 3 containers in it? (Multi-Container) Answer:
Explanation:
image=nginx, image=redis, image=consul
Name nginx container as "nginx-container"
Name redis container as "redis-container"
Name consul container as "consul-container"
Create a pod manifest file for a container and append container
section for rest of the images
kubectl run multi-container --generator=run-pod/v1 --image=nginx --
dry-run -o yaml > multi-container.yaml
# then
vim multi-container.yaml
apiVersion: v1
kind: Pod
metadata:
labels:
run: multi-container
name: multi-container
spec:
containers:
- image: nginx
name: nginx-container
- image: redis
name: redis-container
- image: consul
name: consul-container
restartPolicy: Always
NEW QUESTION # 17
Create a redis pod, and have it use a non-persistent storage
(volume that lasts for the lifetime of the Pod)
NEW QUESTION # 18
You have a Deployment running an application that requires a specific network policy. How can you define a network policy that allows only traffic from Pods belonging to the same namespace as the application and denies all other traffic? Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Network Policy Definition:
2. Explanation: - 'apiVersion: networking.k8s.io/v1 ' : Specifies the API version for NetworkPolicy resources. - 'kind: NetworkPolicy': Specifies that this is a NetworkPolicy resource. - 'metadata.name: allow-same-namespace': Sets the name of the NetworkPolicy. - 'metadata.namespace: Specifies the namespace where the NetworkPolicy is applied. Replace " with the actual namespace where your deployment is running. - 'spec.podSelector: {F: This empty podSelector means the NetworkPolicy applies to all Pods in the namespace. - 'spec.ingress': This section defines the rules for incoming traffic. - 'spec.ingress.from.podSelector: {F: This allows traffic from any Pods within the same namespace. 3. How it works: - This NetworkPolicy allows incoming traffic only from Pods within the same namespace where the Deployment is running. It explicitly denies all other traffic, effectively isolating the application to communication only within its namespace. 4. Implementation: - Apply the YAML using 'kubectl apply -f allow-same-namespace.yaml' 5. Verification: After applying the NetworkPolicy, test the communication between Pods within the same namespace and Pods in other namespaces. You should observe that the NetworkPolicy successfully enforces the defined restrictions.
NEW QUESTION # 19
......
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