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| Section | Weight | Objectives |
|---|---|---|
| Services and Networking | 20% | - Provide and troubleshoot access to applications via services - Demonstrate basic understanding of NetworkPolicies - Use Ingress rules to expose applications |
| Application Environment, Configuration and Security | 25% | - Discover and use resources that extend Kubernetes (CRD, Operators) - Understanding and defining resource requirements, limits and quotas - ConfigMaps and Secrets - ServiceAccounts - SecurityContexts - Understand authentication, authorization and admission control |
| Application Observability and Maintenance | 15% | - Implement probes and health checks - Understand API deprecation policies - Debugging in Kubernetes - Use built-in CLI tools to monitor Kubernetes applications - Utilize container logs |
| Application Deployment | 20% | - Use the Helm package manager to deploy existing packages - Use Kubernetes primitives to implement common deployment strategies (e.g., blue/green or canary) - Kustomize - Understand Deployments and how to perform rolling updates |
| Application Design and Build | 20% | - Understand multi-container Pod design patterns (e.g., sidecar, init and others) - Choose and use the right workload resource (Deployment, DaemonSet, CronJob, etc.) - Define, build and modify container images - Utilize persistent and ephemeral volumes |
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NEW QUESTION # 58
You are developing a multi-container application that includes a web server, a database, and a message broker. You want to ensure that the database and message broker start before the web server to avoid dependency issues. How can you design your deployment to achieve this?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define Pod with Containers:
- Create a 'Pod' definition with three containers: 'web-server', 'database' , and 'message-broker
- Include the appropriate image names for each container.
2. Implement Init Containers: - Define ' initcontainers' within the 'Pod' spec to run containers before the main application containers. - Use 'initContainers' to set up the database and message broker:
3. Apply the Pod Definition: - Apply the 'Pod' definition using 'kubectl apply -f multi-container-app.yamr 4. Verify Container Startup Order: - Check the pod logs using 'kubectl logs -f multi-container-app'. You will observe the init containers ('database-init and 'message-broker-init') starting first, followed by the main containers ('web-server', 'database' , and 'message-broker'). Note: In this example, the 'database-init and 'message-broker-init containers simply print a message. You can replace these with actual initialization scripts or commands relevant to your specific database and message broker services.
NEW QUESTION # 59
You have a Deployment named 'web-app-deployment that runs 5 replicas of a web application container. You need to ensure that only one pod iS updated at a time during a rolling update. Additionally, you want to set the update strategy so that no more than 2 pods are unavailable at any given time.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
I). Update the Deployment YAMI-:
- Update the 'replicas' to 5.
- Define 'maxunavailable: 1 ' and 'maxSurge: 2 in the 'strategy.rollingUpdate' section to control the rolling update process.
- Configure a 'strategy.types to 'RollinglJpdate' to trigger a rolling update when the deployment is updated.
2. Create the Deployment: - Apply the updated YAML file using 'kubectl apply -f web-app-deployment-yamr 3. Verify the Deployment: - Check the status of the deployment using 'kubectl get deployments web-app-deployment to confirm the rollout and updated replica count. 4. Trigger the Automatic Update: - Push a new image to the 'web-app-image:latest' Docker Hub repository 5. Monitor the Deployment: - Use 'kubectl get pods -I app=web-app' to monitor the pod updates during the rolling update process. You will observe that one pod is terminated at a time, while one new pod with the updated image is created. Additionally, you'll see that the number of unavailable pods never exceeds 2. 6. Check for Successful Update: - Once the deployment is complete, use "oubect1 describe deployment web-app-deployment' to see that the 'updatedReplicas' field matches the 'replicas' field, indicating a successful update.
NEW QUESTION # 60
Context
Task
A Deployment named backend-deployment in namespace staging runs a web application on port 8081.
Answer:
Explanation:
Solution:
NEW QUESTION # 61
You are tasked with deploying an application with a deployment named 'web-app' that requires a specific SecurityContext to run. The application should be able to access a specific hostPath volume mounted at '/data' and should be able to run as a non-root user with a specific UID. You need to define the Securitycontext in your Deployment configuration to ensure the application runs with the required privileges and access.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Securitycontext in the Deployment YAML:
- Create a 'securityContext' section within the 'spec-template.spec.containerss block for your application container
- Set the 'runAsLJser' field to the desired non-root IJID (e.g., 1000).
- Specify 'allowPrivilegeEscalatiom false' to prevent the container from escalating its privileges beyond the defined CJID.
- Add a 'hostPatm volume mount with 'readOnly: false' to allow the application to read and write to the mounted directory.
- Define a 'volume' with the 'hostPath' type, specifying the source path (e.g., ',/data') and the path within the container where it should be mounted.
2. Create the Deployment: - Apply the Deployment YAML file using 'kubectl apply -f web-app-deployment.yamr 3. Verify the Deployment - Check the status of the Deployment using 'kubectl get deployments web-app'. You should see a running pod with the specified Securitycontext. - Use kubectl describe pod' to inspect the details of the pod and verify that the Securitycontext is applied correctly. 4. Test the Application: - Ensure that your application can access and modify the '/data' volume with the specified user ID (1000). - The 'securitycontext' allows you to define security settings for the application container, such as user ID and privilege escalation- - 'runAsIJsers specifies the IJID under which the container should run. - 'allowPrivilegeEscalation' controls whether the container can elevate its privileges beyond the specified IJID. - 'hostPath' volume mounts allow containers to access directories on the host system. - 'readOnly' determines whether the volume mount iS read-only or read-write. - Ensure your container image has the necessary permissions to access the hostPath volume within the specified UID.
NEW QUESTION # 62
You are running a web application within a Kubernetes cluster. The application consists of two pods, each with a resource request of 1CPU core and I GiB of memory. However, you've noticed that the application experiences performance issues during peak traffic hours. To mitigate these issues, you decide to implement resource quotas tor the namespace where the application runs. You want to ensure that the application pods receive adequate resources while preventing other applications from consuming excessive resources. Design and implement a resource quota for the namespace that sets limits for CPU and memory resources.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Define the Resource Quota:
- Create a YAML file (e.g., resource-quota.yaml') containing the following resource quota configuration:
2. Apply the Resource Quota: - Apply the resource quota to the 'web-app' namespace using the following command: bash kubectl apply -f resource-quota-yaml 3. Verify the Resource Quota: - Check the status of the resource quota using the following command: bash kubectl get resourcequotas -n web-app You should see the 'web-app-quota' listed with its defined limits and requests. 4. Monitor Resource Usage: - Use the 'kubectl describe resourcequota web-app-quota -n web-apps command to monitor the current resource usage within the 'web-apps namespace- This will show you the consumed resources against the defined limits. 5. Adjust the Resource Quota: - If the resource quota is too restrictive or not restrictive enough, you can adjust the values in the 'requests' and 'limits' fields in the 'resource. quota.yaml file and reapply the resource quota using 'kubectl apply'. - The resource quota limits the total amount of resources (CPU and memory) that can be consumed by all pods in the 'web-app' namespace. - The requests' field specifies the total amount of resources that pods in the namespace can request. - The 'limits' field sets a hard limit on the total amount of resources that pods can use, preventing them from exceeding these limits. - This ensures that the web application has access to the required resources while preventing other applications in the namespace from consuming all available resources. ,
NEW QUESTION # 63
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