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NEW QUESTION 38
You have a containerized app that requires an Autonomous Transaction Processing (ATP) Database. Which option is not valid for o from a container in Kubernetes?
Answer: B
Explanation:
The Kubernetes documentation lays out the following use case for the Service Catalog API:
An application developer wants to use message queuing as part of their application running in a Kubernetes cluster. However, they do not want to deal with the overhead of setting such a service up and administering it themselves. Fortunately, there is a cloud provider that offers message queuing as a managed service through its service broker.
A cluster operator can setup Service Catalog and use it to communicate with the cloud provider's service broker to provision an instance of the message queuing service and make it available to the application within the Kubernetes cluster. The application developer therefore does not need to be concerned with the implementation details or management of the message queue. The application can simply use it as a service.
The samples in the OCI Service Broker source code include a deployment YAML file that describes how to use an init container to take the values in the Autonomous Transaction Processing service binding and put them in environment variables or in a volume mount. After that, your application can use those values to connect to the database.
Once you've installed and registered the service broker, you're ready to use the ATP service plan to provision an ATP instance. I'll go into details below, but the overview of the process looks like so:
-Create a Kubernetes secret with a new admin and wallet password (in JSON format)
- Create a YAML configuration for the ATP Service Instance
- Deploy the Service Instance
- Create a YAML config for the ATP Service Binding
- Deploy the Service Binding to obtain which results in the creation of a new Kubernetes secret containing the wallet contents
- Create a Kubernetes secret for Microservice deployment use containing the admin password and the wallet password (in plain text format)
- Create a YAML config for the Microservice deployment which uses an initContainer to decode the wallet secrets (due to a bug which double encodes them) and mounts the wallet contents as a volume References:
https://blogs.oracle.com/developers/creating-an-atp-instance-with-the-oci-service-broker
https://blogs.oracle.com/cloud-infrastructure/integrating-oci-service-broker-with-autonomous-transaction-processing-in-the-real-world
NEW QUESTION 39
You are deploying an API via Oracle Cloud Infrastructure (OCI) API Gateway and you want to implement request policies to control access Which is NOT available in OCI API Gateway?
Answer: C
Explanation:
Adding Request Policies and Response Policies to API Deployment Specifications:
You can control the behavior of an API deployment you create on an API gateway by adding request and response policies to the API deployment specification:
a request policy describes actions to be performed on an incoming request from a caller before it is sent to a back end a response policy describes actions to be performed on a response returned from a back end before it is sent to a caller You can use request policies to:
limit the number of requests sent to back-end services
enable CORS (Cross-Origin Resource Sharing) support
provide authentication and authorization
You can add request and response policies that apply globally to all routes in an API deployment specification, and also (in some cases) request and response policies that apply only to particular routes.
Note the following:
No response policies are currently available.
API Gateway request policies and response policies are different to IAM policies, which control access to Oracle Cloud Infrastructure resources.
You can add request and response policies to an API deployment specification by:
using the Console
editing a JSON file
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/APIGateway/Tasks/apigatewayaddingrequestpolicies.htm
NEW QUESTION 40
Who is responsible for patching, upgrading and maintaining the worker nodes in Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE)?
Answer: C
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 41
Which one of the following is NOT a valid backend-type supported by Oracle Cloud Infrastructure (OCI) API Gateway?
Answer: C
Explanation:
In the API Gateway service, a back end is the means by which a gateway routes requests to the back-end services that implement APIs. If you add a private endpoint back end to an API gateway, you give the API gateway access to the VCN associated with that private endpoint.
You can also grant an API gateway access to other Oracle Cloud Infrastructure services as back ends. For example, you could grant an API gateway access to Oracle Functions, so you can create and deploy an API that is backed by a serverless function.
API Gateway service to create an API gateway, you can create an API deployment to access HTTP and HTTPS URLs.
https://docs.cloud.oracle.com/en-us/iaas/Content/APIGateway/Tasks/apigatewayusinghttpbackend.htm API Gateway service to create an API gateway, you can create an API deployment that invokes serverless functions defined in Oracle Functions.
https://docs.cloud.oracle.com/en-us/iaas/Content/APIGateway/Tasks/apigatewayusingfunctionsbackend.htm API Gateway service, you can define a path to a stock response back end
https://docs.cloud.oracle.com/en-us/iaas/Content/APIGateway/Tasks/apigatewayaddingstockresponses.htm
NEW QUESTION 42
A developer using Oracle Cloud Infrastructure (OCI) API Gateway must authenticate the API requests to their web application. The authentication process must be implemented using a custom scheme which accepts string parameters from the API caller. Which method can the developer use In this scenario?
Answer: D
Explanation:
Using Authorizer Functions to Add Authentication and Authorization to API Deployments:
You can control access to APIs you deploy to API gateways using an 'authorizer function' (as described in this topic), or using JWTs (as described in Using JSON Web Tokens (JWTs) to Add Authentication and Authorization to API Deployments).
You can add authentication and authorization functionality to API gateways by writing an 'authorizer function' that:
1. Processes request attributes to verify the identity of a caller with an identity provider.
2.Determines the operations that the caller is allowed to perform.
3.Returns the operations the caller is allowed to perform as a list of 'access scopes' (an 'access scope' is an arbitrary string used to determine access).
Optionally returns a key-value pair for use by the API deployment. For example, as a context variable for use in an HTTP back end definition (see Adding Context Variables to Policies and HTTP Back End Definitions).
Create an authorizer function using request header authorization implemented using a custom scheme which accepts string parameters from the API caller.
Managing Input Parameters
In our case we will need to manage quite a few static parameters in our code. For example the URLs of the secrets service endpoints, the username and other constant parameterised data. We can manage these either at Application or Function level (an OCI Function is packaged in an Application which can contain multiple Functions). In this case I will create function level parameters. You can use the following command to create the parameters:
fn config function test idcs-assert idcsClientId aedc15531bc8xxxxxxxxxxbd8a193
References:
https://technology.amis.nl/2020/01/03/oracle-cloud-api-gateway-using-an-authorizer-function-for-client-secret-authorization-on-api-access/
https://docs.cloud.oracle.com/en-us/iaas/Content/APIGateway/Tasks/apigatewayusingauthorizerfunction.htm
https://www.ateam-oracle.com/how-to-implement-an-oci-api-gateway-authorization-fn-in-nodejs-that-accesses-oci-resources
NEW QUESTION 43
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