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NEW QUESTION 27
You created a pod called "nginx" and its state is set to Pending.
Which command can you run to see the reason why the "nginx" pod is in the pending state?

• A. kubect2 get pod nginx
• B. kubect2 describe pod nginx
• C. Through the Oracle Cloud Infrastructure Console
• D. kubect2 logs pod nginx

Answer: B

Explanation:
Debugging Pods
The first step in debugging a pod is taking a look at it. Check the current state of the pod and recent events with the following command:
kubectl describe pods ${POD_NAME}
Look at the state of the containers in the pod. Are they all Running? Have there been recent restarts?
Continue debugging depending on the state of the pods.
My pod stays pending
If a pod is stuck in Pending it means that it can not be scheduled onto a node. Generally this is because there are insufficient resources of one type or another that prevent scheduling. Look at the output of the kubectl describe ... command above. There should be messages from the scheduler about why it can not schedule your pod.
https://kubernetes.io/docs/tasks/debug-application-cluster/debug-pod-replication-controller/

NEW QUESTION 28
A service you are deploying to Oracle infrastructure (OCI) Container En9ine for Kubernetes (OKE) uses a docker image from a private repository Which configuration is necessary to provide access to this repository from OKE?

• A. Add a generic secret on the cluster containing your identity credentials. Then specify a registrycredentials property in the deployment manifest.
• B. Create a docker-registry secret for OCIR with identity Auth Token on the cluster, and specify the image pull secret property in the application deployment manifest.
• C. Create a dynamic group for nodes in the cluster, and a policy that allows the dynamic group to read repositories in the same compartment.
• D. Create a docker-registry secret for OCIR with API key credentials on the cluster, and specify the imagepullsecret property in the application deployment manifest.

Answer: B

Explanation:
Pulling Images from Registry during Deployment
During the deployment of an application to a Kubernetes cluster, you'll typically want one or more images to be pulled from a Docker registry. In the application's manifest file you specify the images to pull, the registry to pull them from, and the credentials to use when pulling the images. The manifest file is commonly also referred to as a pod spec, or as a deployment.yaml file (although other filenames are allowed).
If you want the application to pull images that reside in Oracle Cloud Infrastructure Registry, you have to perform two steps:
- You have to use kubectl to create a Docker registry secret. The secret contains the Oracle Cloud Infrastructure credentials to use when pulling the image. When creating secrets, Oracle strongly recommends you use the latest version of kubectl To create a Docker registry secret:
1- If you haven't already done so, follow the steps to set up the cluster's kubeconfig configuration file and (if necessary) set the KUBECONFIG environment variable to point to the file. Note that you must set up your own kubeconfig file. You cannot access a cluster using a kubeconfig file that a different user set up.
2- In a terminal window, enter:
$ kubectl create secret docker-registry <secret-name> --docker-server=<region-key>.ocir.io --docker-username='<tenancy-namespace>/<oci-username>' --docker-password='<oci-auth-token>' --docker-email='<email-address>' where:
<secret-name> is a name of your choice, that you will use in the manifest file to refer to the secret . For example, ocirsecret
<region-key> is the key for the Oracle Cloud Infrastructure Registry region you're using. For example, iad. See Availability by Region.
ocir.io is the Oracle Cloud Infrastructure Registry name.
<tenancy-namespace> is the auto-generated Object Storage namespace string of the tenancy containing the repository from which the application is to pull the image (as shown on the Tenancy Information page). For example, the namespace of the acme-dev tenancy might be ansh81vru1zp. Note that for some older tenancies, the namespace string might be the same as the tenancy name in all lower-case letters (for example, acme-dev).
<oci-username> is the username to use when pulling the image. The username must have access to the tenancy specified by <tenancy-name>. For example, [email protected] . If your tenancy is federated with Oracle Identity Cloud Service, use the format oracleidentitycloudservice/<username>
<oci-auth-token> is the auth token of the user specified by <oci-username>. For example, k]j64r{1sJSSF-;)K8
<email-address> is an email address. An email address is required, but it doesn't matter what you specify. For example, [email protected]
- You have to specify the image to pull from Oracle Cloud Infrastructure Registry, including the repository location and the Docker registry secret to use, in the application's manifest file.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Registry/Tasks/registrypullingimagesfromocir.htm

NEW QUESTION 29
You are building a cloud native, serverless travel application with multiple Oracle Functions in Java, Python and Node.js. You need to build and deploy these functions to a single applications named travel-app.
Which command will help you complete this task successfully?

• A. fn function deploy --all --application-name travel-ap
• B. fn -v deploy --ap travel-ap -- all
• C. oci fn application --application-name-ap deploy --all
• D. oci fn function deploy --ap travel-ap --all

Answer: B

Explanation:
To get started with Oracle Functions:
Creating, Deploying, and Invoking a Helloworld Function
Step 6- Change directory to the newly created helloworld-func directory.
Step 7- Enter the following single Fn Project command to build the function and its dependencies as a Docker image called helloworld-func, push the image to the specified Docker registry, and deploy the function to Oracle Functions in the helloworld-app:
$ fn -v deploy --app helloworld-app
The -v option simply shows more detail about what Fn Project commands are doing (see Using the Fn Project CLI with Oracle Functions).
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionscreatingfirst.htm

NEW QUESTION 30
You have deployed a Python application on Oracle Cloud Infrastructure Container Engine for Kubernetes. However, during testing you found a bug that you rectified and created a new Docker image. You need to make sure that if this new Image doesn't work then you can roll back to the previous version.
Using kubectl, which deployment strategies should you choose?

• A. Blue/Green Deployment
• B. Canary Deployment
• C. A/B Testing
• D. Rolling Update

Answer: A

Explanation:
Using Blue-Green Deployment to Reduce Downtime and Risk:
>Blue-green deployment is a technique that reduces downtime and risk by running two identical production environments called Blue and Green. At any time, only one of the environments is live, with the live environment serving all production traffic. For this example, Blue is currently live and Green is idle.
This technique can eliminate downtime due to app deployment. In addition, blue-green deployment reduces risk: if something unexpected happens with your new version on Green, you can immediately roll back to the last version by switching back to Blue.

>Canary deployments are a pattern for rolling out releases to a subset of users or servers. The idea is to first deploy the change to a small subset of servers, test it, and then roll the change out to the rest of the servers. The canary deployment serves as an early warning indicator with less impact on downtime: if the canary deployment fails, the rest of the servers aren't impacted.
>A/B testing is a way to compare two versions of a single variable, typically by testing a subject's response to variant A against variant B, and determining which of the two variants is more effective
>Rolling update offers a way to deploy the new version of your application gradually across your cluster.
References:
https://docs.cloudfoundry.org/devguide/deploy-apps/blue-green.html

NEW QUESTION 31
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