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Oracle Cloud Infrastructure 2022 Developer Professional Sample Questions (Q29-Q34):

NEW QUESTION # 29
Which two are required to enable Oracle Cloud Infrastructure (OCI) Container Engine for Kubernetes (OKE) cluster access from the kubect1 CLI?

• A. Install and configure the OCI CLI
• B. An SSH key pair with the public key added to cluster worker nodes
• C. A configured OCI API signing key pair
• D. OCI Identity and Access Management Auth Token
• E. Tiller enabled on the OKE cluster

Answer: A,C Explanation:
Setting Up Local Access to Clusters
To set up a kubeconfig file to enable access to a cluster using a local installation of kubectl and the Kubernetes Dashboard:
Step 1: Generate an API signing key pair
Step 2: Upload the public key of the API signing key pair
Step 3: Install and configure the Oracle Cloud Infrastructure CLI
Step 4: Set up the kubeconfig file
Step 5: Verify that kubectl can access the cluster
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengdownloadkubeconfigfile.htm
NEW QUESTION # 30
Who is responsible for patching, upgrading and maintaining the worker nodes in Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE)?

• A. Independent Software Vendors
• B. Oracle Support
• C. It Is automated
• D. The user

Answer: D Explanation:
After a new version of Kubernetes has been released and when Container Engine for Kubernetes supports the new version, you can use Container Engine for Kubernetes to upgrade master nodes running older versions of Kubernetes. Because Container Engine for Kubernetes distributes the Kubernetes Control Plane on multiple Oracle-managed master nodes (distributed across different availability domains in a region where supported) to ensure high availability, you're able to upgrade the Kubernetes version running on master nodes with zero downtime.
Having upgraded master nodes to a new version of Kubernetes, you can subsequently create new node pools running the newer version. Alternatively, you can continue to create new node pools that will run older versions of Kubernetes (providing those older versions are compatible with the Kubernetes version running on the master nodes).
Note that you upgrade master nodes by performing an 'in-place' upgrade, but you upgrade worker nodes by performing an 'out-of-place' upgrade. To upgrade the version of Kubernetes running on worker nodes in a node pool, you replace the original node pool with a new node pool that has new worker nodes running the appropriate Kubernetes version. Having 'drained' existing worker nodes in the original node pool to prevent new pods starting and to delete existing pods, you can then delete the original node pool.
Upgrading the Kubernetes Version on Worker Nodes in a Cluster:
After a new version of Kubernetes has been released and when Container Engine for Kubernetes supports the new version, you can use Container Engine for Kubernetes to upgrade master nodes running older versions of Kubernetes. Because Container Engine for Kubernetes distributes the Kubernetes Control Plane on multiple Oracle-managed master nodes (distributed across different availability domains in a region where supported) to ensure high availability, you're able to upgrade the Kubernetes version running on master nodes with zero downtime.
You can upgrade the version of Kubernetes running on the worker nodes in a cluster in two ways:
(A) Perform an 'in-place' upgrade of a node pool in the cluster, by specifying a more recent Kubernetes version for new worker nodes starting in the existing node pool. First, you modify the existing node pool's properties to specify the more recent Kubernetes version. Then, you 'drain' existing worker nodes in the node pool to prevent new pods starting, and to delete existing pods. Finally, you terminate each of the worker nodes in turn. When new worker nodes are started in the existing node pool, they run the more recent Kubernetes version you specified. See Performing an In-Place Worker Node Upgrade by Updating an Existing Node Pool.
(B) Perform an 'out-of-place' upgrade of a node pool in the cluster, by replacing the original node pool with a new node pool. First, you create a new node pool with a more recent Kubernetes version. Then, you 'drain' existing worker nodes in the original node pool to prevent new pods starting, and to delete existing pods. Finally, you delete the original node pool. When new worker nodes are started in the new node pool, they run the more recent Kubernetes version you specified. See Performing an Out-of-Place Worker Node Upgrade by Replacing an Existing Node Pool with a New Node Pool.
Note that in both cases:
The more recent Kubernetes version you specify for the worker nodes in the node pool must be compatible with the Kubernetes version running on the master nodes in the cluster. See Upgrading Clusters to Newer Kubernetes Versions).
You must drain existing worker nodes in the original node pool. If you don't drain the worker nodes, workloads running on the cluster are subject to disruption.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengupgradingk8sworkernode.htm
NEW QUESTION # 31
You are processing millions of files in an Oracle Cloud Infrastructure (OCI) Object Storage bucket. Each time a new file is created, you want to send an email to the customer and create an order in a database. The solution should perform and minimize cost, Which action should you use to trigger this email?

• A. Schedule an Oracle Function that checks the OCI Object Storage bucket every second and emails the customer when a file is found.
• B. Schedule an Oracle Function that checks the OCI Object Storage bucket every minute and emails the customer when a file is found.
• C. Schedule a cron job that monitors the OCI Object Storage bucket and emails the customer when a new file is created.
• D. Use OCI Events service and OCI Notification service to send an email each time a file is created.

Answer: D Explanation:
Oracle Cloud Infrastructure Events enables you to create automation based on the state changes of resources throughout your tenancy. Use Events to allow your development teams to automatically respond when a resource changes its state.
Here are some examples of how you might use Events:
Send a notification to a DevOps team when a database backup completes.
Convert files of one format to another when files are uploaded to an Object Storage bucket.
You can only deliver events to certain Oracle Cloud Infrastructure services with a rule. Use the following services to create actions:
Notifications
Streaming
Functions

References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Events/Concepts/eventsoverview.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Notification/Concepts/notificationoverview.htm
NEW QUESTION # 32
Which header is NOT required when signing GET requests to Oracle Cloud Infrastructure APIs?

• A. date or x-date
• B. host
• C. content-type
• D. (request-target)

Answer: C Explanation:
Authorization Header
The Oracle Cloud Infrastructure signature uses the "Signature" Authentication scheme (with an Authorization header), and not the Signature HTTP header.
This section describes the headers that must be included in the signing string:
For GET and DELETE requests (when there's no content in the request body), the signing string must include at least these headers:
(request-target)
host
date or x-date (if both are included, Oracle uses x-date)
For PUT and POST requests (when there's content in the request body), the signing string must include at least these headers:
(request-target)
host
date or x-date (if both are included, Oracle uses x-date)
x-content-sha256 (except for Object Storage PUT requests; see the next section) content-type content-length References:
https://docs.cloud.oracle.com/en-us/iaas/Content/API/Concepts/signingrequests.htm
NEW QUESTION # 33
You are building a container image and pushing it to the Oracle Cloud Infrastructure Registry (OCIR). You need to make sure that these get deleted from the repository.
Which action should you take?

• A. In your compartment, write a policy to limit access to the specific repository.
• B. Create a group and assign a policy to perform lifecycle operations on images.
• C. Set global policy of image retention to "Retain All Images".
• D. Edit the tenancy global retention policy.

Answer: D Explanation:
Deleting an Image
When you no longer need an old image or you simply want to clean up the list of image tags in a repository, you can delete images from Oracle Cloud Infrastructure Registry.
Your permissions control the images in Oracle Cloud Infrastructure Registry that you can delete. You can delete images from repositories you've created, and from repositories that the groups to which you belong have been granted access by identity policies. If you belong to the Administrators group, you can delete images from any repository in the tenancy.
Note that as well deleting individual images , you can set up image retention policies to delete images automatically based on selection criteria you specify (see Retaining and Deleting Images Using Retention Policies).
Note:
In each region in a tenancy, there's a global image retention policy. The global image retention policy's default selection criteria retain all images so that no images are automatically deleted. However, you can change the global image retention policy so that images are deleted if they meet the criteria you specify. A region's global image retention policy applies to all repositories in the region, unless it is explicitly overridden by one or more custom image retention policies.
You can set up custom image retention policies to override the global image retention policy with different criteria for specific repositories in a region. Having created a custom image retention policy, you apply the custom retention policy to a repository by adding the repository to the policy. The global image retention policy no longer applies to repositories that you add to a custom retention policy.
https://docs.cloud.oracle.com/en-us/iaas/Content/Registry/Tasks/registrymanagingimageretention.htm#:~:text=In%20each%20region%20in%20a,meet%20the%20criteria%20you%20specify.
NEW QUESTION # 34
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