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NEW QUESTION 41
You are developing a serverless application with Oracle Functions. You have created a function in compartment named prod. When you try to invoke your function you get the following error.
Error invoking function. status: 502 message: dhcp options ocid1.dhcpoptions.oc1.phx.aaaaaaaac… does not exist or Oracle Functions is not authorized to use it How can you resolve this error?

  • A. Deleting the function and redeploying it will fix the problem
  • B. Create a policy:
    Allow any-user to manage function-family and virtual-network-family in compartment prod
  • C. Create a policy:
    Allow function-family to use virtual-network-family in compartment prod
  • D. Create a policy:
    Allow service FaaS to use virtual-network-family in compartment prod

Answer: D

Explanation:
Troubleshooting Oracle Functions:
There are common issues related to Oracle Functions and how you can address them.
Invoking a function returns a FunctionInvokeSubnetNotAvailable message and a 502 error (due to a DHCP Options issue) When you invoke a function that you’ve deployed to Oracle Functions, you might see the following error message:
{“code”:”FunctionInvokeSubnetNotAvailable”,”message”:”dhcp options ocid1.dhcpoptions…….. does not exist or Oracle Functions is not authorized to use it”} Fn: Error invoking function. status: 502 message: dhcp options ocid1.dhcpoptions…….. does not exist or Oracle Functions is not authorized to use it If you see this error:
Double-check that a policy has been created to give Oracle Functions access to network resources.
Create Policies to Control Access to Network and Function-Related Resources:
Service Access to Network Resources
When Oracle Functions users create a function or application, they have to specify a VCN and a subnet in which to create them. To enable the Oracle Functions service to create the function or application in the specified VCN and subnet, you must create an identity policy to grant the Oracle Functions service access to the compartment to which the network resources belong.
To create a policy to give the Oracle Functions service access to network resources:
Log in to the Console as a tenancy administrator.
Create a new policy in the root compartment:
Open the navigation menu. Under Governance and Administration, go to Identity and click Policies.
Follow the instructions in To create a policy, and give the policy a name (for example, functions-service-network-access).
Specify a policy statement to give the Oracle Functions service access to the network resources in the compartment:
Allow service FaaS to use virtual-network-family in compartment <compartment-name> For example:
Allow service FaaS to use virtual-network-family in compartment acme-network Click Create.
Double-check that the set of DHCP Options in the VCN specified for the application still exists.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionstroubleshooting.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionscreatingpolicies.htm

 

NEW QUESTION 42
You are working on a serverless DevSecOps application using Oracle Functions. You have deployed a Python function that uses the Oracle Cloud Infrastructure (OCI) Python SDK to stop any OC1 Compute instance that does not comply with your corporate security standards There are 3 non compliant OCI Compute instances.
However, when you invoke this function none of the instances were stopped. How should you troubleshoot this?

  • A. Enable function logging in the OCI console, include some print statements in your function code and use logs to troubleshoot this.
  • B. Enable function tracing in the OCI console, and go to OCI Monitoring console to see the function stack trace.
  • C. There is no way to troubleshoot a function running on Oracle Functions.
  • D. Enable function remote debugging in the OCI console, and use your favorite IDE to inspect the function running on Oracle Functions.

Answer: A

Explanation:
Storing and Viewing Function Logs:
When a function you’ve deployed to Oracle Functions is invoked, you’ll typically want to store the function’s logs so that you can review them later. You specify where Oracle Functions stores a function’s logs by setting a logging policy for the application containing the function.
You can specify that Oracle Functions:
Stores logs in Oracle Cloud Infrastructure. Until an Oracle Cloud Infrastructure logging service is released, Oracle Functions stores logs as files in a storage bucket in Oracle Cloud Infrastructure Object Storage.
Note that to view function logs in a storage bucket, the group to which you belong must have been granted access with the following identity policy statements:
Allow group <group-name> to manage object-family in compartment <compartment-name> Allow group <group-name> to read objectstorage-namespaces in compartment <compartment-name> (Usually created when configuring your tenancy for function development. See Create a Policy to Give Oracle Functions Users Access to Oracle Cloud Infrastructure Registry Repositories.) Stores logs by exporting them to an external logging destination like Papertrail. Note that to use an external logging destination, you must have set up a VCN with public subnets and an internet gateway (see Create the VCN and Subnets to Use with Oracle Functions, if they don’t exist already).
You set application logging policies in the Console.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsexportingfunctionlogfiles.htm

 

NEW QUESTION 43
Which two are required to enable Oracle Cloud Infrastructure (OCI) Container Engine for Kubernetes (OKE) cluster access from the kubect1 CLI?

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

Answer: C,D

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 44
Which two statements are true for service choreography?

  • A. Service choreography relies on a central coordinator.
  • B. Decision logic in service choreography is distributed.
  • C. Services involved in choreography communicate through messages/messaging systems.
  • D. Service choreographer is responsible for invoking other services.
  • E. Service choreography should not use events for communication.

Answer: B,C

Explanation:
Service Choreography
Service choreography is a global description of the participating services, which is defined by exchange of messages, rules of interaction and agreements between two or more endpoints. Choreography employs a decentralized approach for service composition. the decision logic is distributed, with no centralized point.

Choreography, in contrast, does not rely on a central coordinator. and all participants in the choreography need to be aware of the business process, operations to execute, messages to exchange, and the timing of message exchanges.
References:
https://stackoverflow.com/questions/4127241/orchestration-vs-choreography/33316988

 

NEW QUESTION 45
Which two are characteristics of microservices?

  • A. Microservices can be implemented in limited number of programming languages.
  • B. All microservices share a data store.
  • C. Microservices can be independently deployed.
  • D. Microservices are hard to test in isolation.
  • E. Microservices communicate over lightweight APIs.

Answer: C,E

Explanation:
Learn About the Microservices Architecture
If you want to design an application that is multilanguage, easily scalable, easy to maintain and deploy, highly available, and that minimizes failures, then use the microservices architecture to design and deploy a cloud application.
In a microservices architecture, each microservice owns a simple task, and communicates with the clients or with other microservices by using lightweight communication mechanisms such as REST API requests.
The following diagram shows the architecture of an application that consists of multiple microservices.

Microservices enable you to design your application as a collection of loosely coupled services. Microservices follow the share-nothing model, and run as stateless processes. This approach makes it easier to scale and maintain the application.
The API layer is the entry point for all the client requests to a microservice. The API layer also enables the microservices to communicate with each other over HTTP, gRPC, and TCP/UDP.
The logic layer focuses on a single business task, minimizing the dependencies on the other microservices. This layer can be written in a different language for each microservice.
The data store layer provides a persistence mechanism, such as a database storage engine, log files, and so on. Consider using a separate persistent data store for each microservice.
Typically, each microservice runs in a container that provides a lightweight runtime environment.
Loosely coupled with other services – enables a team to work independently the majority of time on their service(s) without being impacted by changes to other services and without affecting other services

References:
https://docs.oracle.com/en/solutions/learn-architect-microservice/index.html
https://microservices.io/patterns/microservices.html
https://www.techjini.com/blog/microservices/

 

NEW QUESTION 46
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