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NEW QUESTION 49
What can you use to dynamically make Kubernetes resources discoverable to public DNS servers?

A. kubeDNSB. ExternalDNSC. CoreDNSD. DynDNS

Answer: B

Explanation:
Setting up ExternalDNS for Oracle Cloud Infrastructure (OCI):
Inspired by Kubernetes DNS, Kubernetes' cluster-internal DNS server, ExternalDNS makes Kubernetes resources discoverable via public DNS servers. Like KubeDNS, it retrieves a list of resources (Services, Ingresses, etc.) from the Kubernetes API to determine a desired list of DNS records.
In a broader sense, ExternalDNS allows you to control DNS records dynamically via Kubernetes resources in a DNS provider-agnostic way Deploy ExternalDNS Connect your kubectl client to the cluster you want to test ExternalDNS with. We first need to create a config file containing the information needed to connect with the OCI API.
Create a new file (oci.yaml) and modify the contents to match the example below. Be sure to adjust the values to match your own credentials:
auth:
region: us-phoenix-1
tenancy: ocid1.tenancy.oc1...
user: ocid1.user.oc1...
key: |
-----BEGIN RSA PRIVATE KEY-----
-----END RSA PRIVATE KEY-----
fingerprint: af:81:71:8e...
compartment: ocid1.compartment.oc1...
References:
https://github.com/kubernetes-sigs/external-dns/blob/master/README.md
https://github.com/kubernetes-sigs/external-dns/blob/master/docs/tutorials/oracle.md

 

NEW QUESTION 50
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?

A. Create an authorizer function using token-based authorization.B. Create an authorizer function using OCI Identity and Access Management based authenticationC. Create a cross account functions authorizer.D. Create an authorizer function using request header authorization.

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 51
Which testing approaches is a must for achieving high velocity of deployments and release of cloud-native applications?

A. Penetration testingB. Automated testingC. A/B testingD. Integration testing

Answer: B

Explanation:
Oracle Cloud Infrastructure provides a number of DevOps tools and plug-ins for working with Oracle Cloud Infrastructure services. These can simplify provisioning and managing infrastructure or enable automated testing and continuous delivery.
A/B Testing
While A/B testing can be combined with either canary or blue-green deployments, it is a very different thing. A/B testing really targets testing the usage behavior of a service or feature and is typically used to validate a hypothesis or to measure two versions of a service or feature and how they stack up against each other in terms of performance, discoverability and usability. A/B testing often leverages feature flags (feature toggles), which allow you to dynamically turn features on and off.
Integration Testing
Integration tests are also known as end-to-end (e2e) tests. These are long-running tests that exercise the system in the way it is intended to be used in production. These are the most valuable tests in demonstrating reliability and thus increasing confidence.
Penetration Testing
Oracle regularly performs penetration and vulnerability testing and security assessments against the Oracle cloud infrastructure, platforms, and applications. These tests are intended to validate and improve the overall security of Oracle Cloud Services.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/API/Concepts/devopstools.htm

 

NEW QUESTION 52
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