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| Section | Objectives |
|---|---|
| State Persistence | - Storage classes and volume mounting - PersistentVolumes and PersistentVolumeClaims |
| Application Deployment | - Use Kubernetes primitives to implement deployments - Understand rolling updates and rollbacks |
| Application Design and Build | - Understand multi-container Pod design patterns - Understand Jobs and CronJobs - Define, build and modify container images |
| Application Observability and Maintenance | - Monitor and troubleshoot applications - Understand probes and health checks |
| Services and Networking | - Pod networking concepts - Services (ClusterIP, NodePort) - Ingress basics |
| Application Environment, Configuration and Security | - ConfigMaps and Secrets usage - Security contexts and service accounts |
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NEW QUESTION # 56
Context
Anytime a team needs to run a container on Kubernetes they will need to define a pod within which to run the container.
Task
Please complete the following:
* Create a YAML formatted pod manifest
/opt/KDPD00101/podl.yml to create a pod named app1 that runs a container named app1cont using image Ifccncf/arg-output with these command line arguments: -lines 56 -F
* Create the pod with the kubect1 command using the YAML file created in the previous step
* When the pod is running display summary data about the pod in JSON format using the kubect1 command and redirect the output to a file named /opt/KDPD00101/out1.json
* All of the files you need to work with have been created, empty, for your convenience
Answer:
Explanation:
Solution:
NEW QUESTION # 57
Exhibit:
Given a container that writes a log file in format A and a container that converts log files from format A to format B, create a deployment that runs both containers such that the log files from the first container are converted by the second container, emitting logs in format B.
Task:
* Create a deployment named deployment-xyz in the default namespace, that:
* Includes a primary
lfccncf/busybox:1 container, named logger-dev
* includes a sidecar Ifccncf/fluentd:v0.12 container, named adapter-zen
* Mounts a shared volume /tmp/log on both containers, which does not persist when the pod is deleted
* Instructs the logger-dev
container to run the command
which should output logs to /tmp/log/input.log in plain text format, with example values:
* The adapter-zen sidecar container should read /tmp/log/input.log and output the data to /tmp/log/output.* in Fluentd JSON format. Note that no knowledge of Fluentd is required to complete this task: all you will need to achieve this is to create the ConfigMap from the spec file provided at /opt/KDMC00102/fluentd-configma p.yaml , and mount that ConfigMap to /fluentd/etc in the adapter-zen sidecar container
Answer: B
NEW QUESTION # 58
Exhibit:
Task
You have rolled out a new pod to your infrastructure and now you need to allow it to communicate with the web and storage pods but nothing else. Given the running pod kdsn00201 -newpod edit it to use a network policy that will allow it to send and receive traffic only to and from the web and storage pods.
Answer: A
NEW QUESTION # 59
You have an application that requires a TLS certificate for secure communication Witn a specific service Within tne Kubernetes cluster. How can you create a Kubernetes secret that holds the certificate and private key, and then configure your deployment to use it?
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Generate a Certificate and Key:
- If you don't already have a certificate and private key, you can use tools like 'openssl to generate them:
bash
openssl req -x509 -newkey rsa:2048 -keyout private-key -out cert.pem -days 365 -nodes
- This will create two files: 'private-key' (private key) and 'cert.pern' (certificate).
2. Create a Kubernetes Secret:
- Create a YAML file, for example, 'tls-secret.yaml':
- Replace and with the Base64 encoded contents of your certificate and key files. You can use 'base64' command for encoding: bash echo "certificate content" | base64 echo "private key content" | base64 3. Apply the Secret: - Apply the secret to your Kubernetes cluster: bash kubectl apply -f tls-secret.yaml 4. Modify your Deployment: - Add the following to your deployment YAML file:
5. Update your Application: - Your application needs to be configured to use the mounted TLS certificate and key from the secret. The specific configuration will depend on the application. - It will typically involve setting environment variables pointing to the location of the certificate and key files, for example, 'TLS_CERT_FILE'and 'TLS_KEY_FILE.
NEW QUESTION # 60
You are tasked with setting up a secure Kubernetes cluster for a web application. The application has sensitive data that must be protected. You need to configure a mecnanism to restrict access to the application's pods based on user identities. Describe a method to achieve this using Kubernetes RBAC and Service Accounts, ensuring that only authorized users can access specific pods.
Answer:
Explanation:
See the solution below with Step by Step Explanation.
Explanation:
Solution (Step by Step) :
1. Create a Service Account
- Create a Service Account for the application:
- Apply the Service Account configuratiom basn kubectl apply -f webapp-sa.yaml 2. Create a Role: - Define a Role that grants access to the specific pods:
- Apply the Role configuratiom bash kubectl apply -f webapp-pod-reader.yaml 3. Create a RoleBinding: - Bind the Role to the Service Account
- Apply the RoleBinding configuration: bash kubectl apply -f webapp-pod-reader-binding_yaml 4. Configure the Application: - When deploying the application, specify the Service Account:
5. Verify Access: - Use the 'kubectr command with the Service Account's credentials to verify that only authorized users can access the application's pods: bash kubectl -service-account=webapp-sa get pods -n This setup utilizes Kubernetes RBAC to control access to the application's pods. - The Service Account acts as an identity for the application. - The Role defines the permissions granted to the Service Account, specifically allowing access to the pods. - The RoleBinding associates the Role with the Service Account, linking the permissions to the identity. - When the application is deployed witn tne specified Service Account, it inherits the permissions defined in the RoleBinding. This ensures that only users with the necessary credentials (associated with the Service Account) can access and interact with the application's pods, safeguarding sensitive data.
NEW QUESTION # 61
......
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