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1z0-1084-22 PDF Questions and Testing Engine With 75 Questions

QUESTION 41
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?

Add a generic secret on the cluster containing your identity credentials. Then specify a registrycredentials property in the deployment manifest.

Create a docker-registry secret for OCIR with API key credentials on the cluster, and specify the imagepullsecret property in the application deployment manifest.

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.

Create a dynamic group for nodes in the cluster, and a policy that allows the dynamic group to read repositories in the same compartment.

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

QUESTION 42
Which two are benefits of distributed systems?

Privacy

Security

Ease of testing

Scalability

Resiliency

distributed systems of native-cloud like functions that have a lot of benefit like Resiliency and availability Resiliency and availability refers to the ability of a system to continue operating, despite the failure or sub-optimal performance of some of its components.
In the case of Oracle Functions:
The control plane is a set of components that manages function definitions.
The data plane is a set of components that executes functions in response to invocation requests.
For resiliency and high availability, both the control plane and data plane components are distributed across different availability domains and fault domains in a region. If one of the domains ceases to be available, the components in the remaining domains take over to ensure that function definition management and execution are not disrupted.
When functions are invoked, they run in the subnets specified for the application to which the functions belong. For resiliency and high availability, best practice is to specify a regional subnet for an application (or alternatively, multiple AD-specific subnets in different availability domains). If an availability domain specified for an application ceases to be available, Oracle Functions runs functions in an alternative availability domain.
Concurrency and Scalability
Concurrency refers to the ability of a system to run multiple operations in parallel using shared resources. Scalability refers to the ability of the system to scale capacity (both up and down) to meet demand.
In the case of Functions, when a function is invoked for the first time, the function’s image is run as a container on an instance in a subnet associated with the application to which the function belongs. When the function is executing inside the container, the function can read from and write to other shared resources and services running in the same subnet (for example, Database as a Service). The function can also read from and write to other shared resources (for example, Object Storage), and other Oracle Cloud Services.
If Oracle Functions receives multiple calls to a function that is currently executing inside a running container, Oracle Functions automatically and seamlessly scales horizontally to serve all the incoming requests. Oracle Functions starts multiple Docker containers, up to the limit specified for your tenancy. The default limit is 30 GB of RAM reserved for function execution per availability domain, although you can request an increase to this limit. Provided the limit is not exceeded, there is no difference in response time (latency) between functions executing on the different containers.

QUESTION 43
What is the difference between blue/green and canary deployment strategies?

In blue/green, application Is deployed In minor increments to a select group of people. In canary, both old and new applications are simultaneously in production.

In blue/green, both old and new applications are in production at the same time. In canary, application is deployed Incrementally to a select group of people.

In blue/green, current applications are slowly replaced with new ones. In < MW y, Application ll deployed incrementally to a select group of people.

In blue/green, current applications are slowly replaced with new ones. In canary, both old and new applications are In production at the same time.

QUESTION 44
You have written a Node.js function and deployed it to Oracle Functions. Next, you need to call this function from a microservice written in Java deployed on Oracle Cloud Infrastructure (OCI) Container Engine for Kubernetes (OKE).
Which can help you to achieve this?

Use the OCI CLI with kubect1 to invoke the function from the microservice.

Oracle Functions does not allow a microservice deployed on OKE to invoke a function.

OKE does not allow a microservice to invoke a function from Oracle Functions.

Use the OCI Java SDK to invoke the function from the microservice.

QUESTION 45
Which is NOT a supported SDK on Oracle Cloud Infrastructure (OCI)?

Ruby SDK

Java SDK

Python SDK

Go SDK

.NET SDK

QUESTION 46
What are two of the main reasons you would choose to implement a serverless architecture?

No need for integration testing

Reduced operational cost

Improved In-function state management

Automatic horizontal scaling

Easier to run long-running operations

QUESTION 47
Which Oracle Cloud Infrastructure (OCI) load balancer shape is used by default in OCI container Engineer for Kubernetes?

400 Mbps

8000 Mbps

There is no default. The shape has to be specified.

100 Mbps

QUESTION 48
A pod security policy (PSP) is implemented in your Oracle Cloud Infrastructure Container Engine for Kubernetes cluster Which rule can you use to prevent a container from running as root using PSP?

NoPrivilege

RunOnlyAsUser

MustRunAsNonRoot

forbiddenRoot

QUESTION 49
You are implementing logging in your services that will be running in Oracle Cloud Infrastructure Container Engine for Kubernetes. Which statement describes the appropriate logging approach?

Each service logs to its own log file.

All services log to an external logging system.

All services log to standard output only.

All services log to a shared log file.

QUESTION 50
In the sample Kubernetes manifest file below, what annotations should you add to create a private load balancer In oracle Cloud infrastructure Container Engine for Kubermetes?

A)

B)

C)

D)

Option A

Option B

Option C

Option D

QUESTION 51
Given a service deployed on Oracle Cloud infrastructure Container Engine for Kubernetes (OKE), which annotation should you add in the sample manifest file to specify a 400 Mbps load balancer?

service.beta, kubernetes. lo/oci-load-balancer-kind: 400Mbps

service, beta, kubernetes. lo/oci-load-balancer-value: 4 00Mbps

service . beta. kubernetes . lo/oci-load-balancer-shape: 400Mbps

service . beta . kubernetes . lo/oci-load-balancer-size: 400Mbps

QUESTION 52
Which testing approaches is a must for achieving high velocity of deployments and release of cloud-native applications?

Integration testing

A/B testing

Automated testing

Penetration testing

QUESTION 53
What is the communication method between different Cloud native applications services?

Complex and asynchronous

Basic and synchronous

Complex and synchronous

Basic and asynchronous

What Is Cloud Native?
Cloud native technologies are characterized by the use of containers, microservices, serverless functions, development pipelines, infrastructure expressed as code, event-driven applications, and Application Programming Interfaces (APIs). Cloud native enables faster software development and the ability to build applications that are resilient, manageable, observable, and dynamically scalable to global enterprise levels.
When constructing a cloud-native application, you’ll want to be sensitive to how back-end services communicate with each other. Ideally, the less inter-service communication, the better. However, avoidance isn’t always possible as back-end services often rely on one another to complete an operation.
While direct HTTP calls between microservices are relatively simple to implement, care should be taken to minimize this practice. To start, these calls are always synchronous and will block the operation until a result is returned or the request times outs. What were once self-contained, independent services, able to evolve independently and deploy frequently, now become coupled to each other. As coupling among microservices increase, their architectural benefits diminish.
Executing an infrequent request that makes a single direct HTTP call to another microservice might be acceptable for some systems. However, high-volume calls that invoke direct HTTP calls to multiple microservices aren’t advisable. They can increase latency and negatively impact the performance, scalability, and availability of your system. Even worse, a long series of direct HTTP communication can lead to deep and complex chains of synchronous microservices calls, shown in Figure 4-9:

A message queue is an intermediary construct through which a producer and consumer pass a message. Queues implement an asynchronous, point-to-point messaging pattern.
Events
Message queuing is an effective way to implement communication where a producer can asynchronously send a consumer a message.
References:
https://www.xenonstack.com/blog/cloud-native-architecture/
https://www.oracle.com/sa/cloud/cloud-native/
https://www.oracle.com/technetwork/topics/entarch/cloud-native-app-development-wp-3664668.pdf

QUESTION 54
What is one of the differences between a microservice and a serverless function?

Microservices are used for long running operations and serverless functions for short running operations.

Microservices always use a data store and serverless functions never use a data store.

Microservices are stateless and serverless functions are stateful.

Microservices are triggered by events and serverless functions are not.

QUESTION 55
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?

oci fn function deploy –ap travel-ap –all

fn -v deploy –ap travel-ap — all

oci fn application –application-name-ap deploy –all

fn function deploy –all –application-name travel-ap

QUESTION 56
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?

Create an authorizer function using request header authorization.

Create an authorizer function using token-based authorization.

Create a cross account functions authorizer.

Create an authorizer function using OCI Identity and Access Management based authentication

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

QUESTION 57
Given a service deployed on Oracle Cloud Infrastructure Container Engine far Kubernetes (OKE), which annotation should you add in the sample manifest file below to specify a 400 Mbps load balancer?

service.beta.kubernetes.io/oci-load-balancer-value: 400Mbps

service.beta.kubernetes.io/oci-load-balancer-size: 400Mbps

service.beta.kubernetes.io/oci-load-balancer-shape: 400Mbps

service, beta, kubernetes . io/oci-load-balancer-kind: 400Mbps

QUESTION 58
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?

Create a group and assign a policy to perform lifecycle operations on images.

Set global policy of image retention to “Retain All Images”.

In your compartment, write a policy to limit access to the specific repository.

Edit the tenancy global retention policy.

QUESTION 59
As a cloud-native developer, you have written a web service for your company. You have used Oracle Cloud Infrastructure (OCI) API Gateway service to expose the HTTP backend. However, your security team has suggested that your web service should handle Distributed Denial-of-Service (DDoS) attack. You are time-constrained and you need to make sure that this is implemented as soon as possible.
What should you do in this scenario?

Use OCI virtual cloud network (VCN) segregation to control DDoS.

Use a third party service integration to implement a DDoS attack mitigation,

Use OCI API Gateway service and configure rate limiting.

Re-write your web service and implement rate limiting.

QUESTION 60
Which pattern can help you minimize the probability of cascading failures in your system during partial loss of connectivity or a complete service failure?

Retry pattern

Anti-corruption layer pattern

Circuit breaker pattern

Compensating transaction pattern

QUESTION 61
You are developing a polyglot serverless application using Oracle Functions. Which language cannot be used to write your function code?

PL/SQL

Python

Node.js

Java

QUESTION 62
With the volume of communication that can happen between different components in cloud-native applications, it is vital to not only test functionality, but also service resiliency.
Which statement is true with regards to service resiliency?

Resiliency is about recovering from failures without downtime or data loss.

A goal of resiliency is not to bring a service to a functioning state after a failure.

Resiliency testing can be only done in a test environment.

Resiliency is about avoiding failures.

QUESTION 63
Your Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE) administrator has created an OKE cluster with one node pool in a public subnet. You have been asked to provide a log file from one of the nodes for troubleshooting purpose.
Which step should you take to obtain the log file?

ssh into the node using public key.

ssh into the nodes using private key.

It is impossible since OKE is a managed Kubernetes service.

Use the username open and password to login.

Kubernetes cluster is a group of nodes. The nodes are the machines running applications. Each node can be a physical machine or a virtual machine. The node’s capacity (its number of CPUs and amount of memory) is defined when the node is created. A cluster comprises:
– one or more master nodes (for high availability, typically there will be a number of master nodes)
– one or more worker nodes (sometimes known as minions)
Connecting to Worker Nodes Using SSH
If you provided a public SSH key when creating the node pool in a cluster, the public key is installed on all worker nodes in the cluster. On UNIX and UNIX-like platforms (including Solaris and Linux), you can then connect through SSH to the worker nodes using the ssh utility (an SSH client) to perform administrative tasks.
Note the following instructions assume the UNIX machine you use to connect to the worker node:
Has the ssh utility installed.
Has access to the SSH private key file paired with the SSH public key that was specified when the cluster was created.
How to connect to worker nodes using SSH depends on whether you specified public or private subnets for the worker nodes when defining the node pools in the cluster.
Connecting to Worker Nodes in Public Subnets Using SSH
Before you can connect to a worker node in a public subnet using SSH, you must define an ingress rule in the subnet’s security list to allow SSH access. The ingress rule must allow access to port 22 on worker nodes from source 0.0.0.0/0 and any source port To connect to a worker node in a public subnet through SSH from a UNIX machine using the ssh utility:
1- Find out the IP address of the worker node to which you want to connect. You can do this in a number of ways:
Using kubectl. 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. See Setting Up Cluster Access. Then in a terminal window, enter kubectl get nodes to see the public IP addresses of worker nodes in node pools in the cluster.
Using the Console. In the Console, display the Cluster List page and then select the cluster to which the worker node belongs. On the Node Pools tab, click the name of the node pool to which the worker node belongs. On the Nodes tab, you see the public IP address of every worker node in the node pool.
Using the REST API. Use the ListNodePools operation to see the public IP addresses of worker nodes in a node pool.
2- In the terminal window, enter ssh opc@<node_ip_address> to connect to the worker node, where <node_ip_address> is the IP address of the worker node that you made a note of earlier. For example, you might enter ssh [email protected].
Note that if the SSH private key is not stored in the file or in the path that the ssh utility expects (for example, the ssh utility might expect the private key to be stored in ~/.ssh/id_rsa), you must explicitly specify the private key filename and location in one of two ways:
Use the -i option to specify the filename and location of the private key. For example, ssh -i ~/.ssh/my_keys/my_host_key_filename [email protected] Add the private key filename and location to an SSH configuration file, either the client configuration file (~/.ssh/config) if it exists, or the system-wide client configuration file (/etc/ssh/ssh_config). For example, you might add the following:
Host 192.0.2.254 IdentityFile ~/.ssh/my_keys/my_host_key_filename
For more about the ssh utility’s configuration file, enter man ssh_config Note also that permissions on the private key file must allow you read/write/execute access, but prevent other users from accessing the file. For example, to set appropriate permissions, you might enter chmod 600 ~/.ssh/my_keys/my_host_key_filename. If permissions are not set correctly and the private key file is accessible to other users, the ssh utility will simply ignore the private key file.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengconnectingworkernodesusingssh.htm

QUESTION 64
Who is responsible for patching, upgrading and maintaining the worker nodes in Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE)?

It Is automated

Independent Software Vendors

Oracle Support

The user

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

QUESTION 65
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?

There is no way to troubleshoot a function running on Oracle Functions.

Enable function logging in the OCI console, include some print statements in your function code and use logs to troubleshoot this.

Enable function remote debugging in the OCI console, and use your favorite IDE to inspect the function running on Oracle Functions.

Enable function tracing in the OCI console, and go to OCI Monitoring console to see the function stack trace.

Oracle 1z0-1084-22 Exam Syllabus Topics:

Topic	Details
Topic 1	Create integration between systems using OCI streaming service Explain the microservices architecture and discuss the design methodology of microservices
Topic 2	Explain cloud native testing and discuss measures for testing cloud native applications Develop Serverless Application with Oracle Functions
Topic 3	Build event-driven serverless applications using OCI event service Explain DevOps and discuss the role of container orchestration
Topic 4	Apply security measures to overcome challenges with cloud native development Explain docker and the concepts around its architecture and components
Topic 5	Utilize OCI Monitoring service to view metrics Explain the fundamentals of cloud native and discuss the key pillars of cloud native development
Topic 6	Monitoring & Troubleshooting Cloud Native Applications Perform Tasks around Monitoring, Logging, and Tracing
Topic 7	Create API gateways to process traffic from API clients and route it to back-end services Leveraging Serverless Technologies for Cloud Native Development

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