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Oracle Cloud Infrastructure 2022 Developer Professional Sample Questions (Q50-Q55):
NEW QUESTION # 50
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?
- A. It is impossible since OKE is a managed Kubernetes service.
- B. Use the username open and password to login.
- C. ssh into the nodes using private key.
- D. ssh into the node using public key.
Answer: C
Explanation:
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
NEW 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?
- A. service, beta, kubernetes. lo/oci-load-balancer-value: 4 00Mbps
- B. service . beta. kubernetes . lo/oci-load-balancer-shape: 400Mbps
- C. service . beta . kubernetes . lo/oci-load-balancer-size: 400Mbps
- D. service.beta, kubernetes. lo/oci-load-balancer-kind: 400Mbps
Answer: B
Explanation:
The shape of an Oracle Cloud Infrastructure load balancer specifies its maximum total bandwidth (that is, ingress plus egress). By default, load balancers are created with a shape of 100Mbps. Other shapes are available, including 400Mbps and 8000Mbps.
To specify an alternative shape for a load balancer, add the following annotation in the metadata section of the manifest file:
service.beta.kubernetes.io/oci-load-balancer-shape: <value>
where value is the bandwidth of the shape (for example, 100Mbps, 400Mbps, 8000Mbps).
For example:
apiVersion: v1
kind: Service
metadata:
name: my-nginx-svc
labels:
app: nginx
annotations:
service.beta.kubernetes.io/oci-load-balancer-shape: 400Mbps
spec:
type: LoadBalancer
ports:
- port: 80
selector:
app: nginx
https://github.com/oracle/oci-cloud-controller-manager/blob/master/docs/load-balancer-annotations.md
NEW QUESTION # 52
Which pattern can help you minimize the probability of cascading failures in your system during partial loss of connectivity or a complete service failure?
- A. Retry pattern
- B. Compensating transaction pattern
- C. Anti-corruption layer pattern
- D. Circuit breaker pattern
Answer: D
Explanation:
A cascading failure is a failure that grows over time as a result of positive feedback. It can occur when a portion of an overall system fails, increasing the probability that other portions of the system fail.
the circuit breaker pattern prevents the service from performing an operation that is likely to fail. For example, a client service can use a circuit breaker to prevent further remote calls over the network when a downstream service is not functioning properly. This can also prevent the network from becoming congested by a sudden spike in failed retries by one service to another, and it can also prevent cascading failures. Self-healing circuit breakers check the downstream service at regular intervals and reset the circuit breaker when the downstream service starts functioning properly.
https://blogs.oracle.com/developers/getting-started-with-microservices-part-three
NEW QUESTION # 53
You are developing a serverless application with Oracle Functions and Oracle Cloud Infrastructure Object Storage- Your function needs to read a JSON file object from an Object Storage bucket named "input-bucket" in compartment "qa-compartment". Your corporate security standards mandate the use of Resource Principals for this use case.
Which two statements are needed to implement this use case?
- A. Set up a policy with the following statement to grant read access to the bucket:
allow dynamic-group read-file-dg to read objects in compartment qa-compartment where target .bucket .name=' input-bucket * - B. Set up a policy to grant your user account read access to the bucket:
allow user XYZ to read objects in compartment qa-compartment where target .bucket, name-'input-bucket' - C. No policies are needed. By default, every function has read access to Object Storage buckets in the tenancy
- D. Set up a policy to grant all functions read access to the bucket:
allow all functions in compartment qa-compartment to read objects in target.bucket.name='input-bucket' - E. Set up the following dynamic group for your function's OCID: Name: read-file-dg Rule: resource . id = ' ocid1. f nf unc. ocl -phx. aaaaaaaakeaobctakezj z5i4uj j 7g25q7sx5mvr55pms6f 4da !
Answer: A,E
Explanation:
When a function you've deployed to Oracle Functions is running, it can access other Oracle Cloud Infrastructure resources. For example:
- You might want a function to get a list of VCNs from the Networking service.
- You might want a function to read data from an Object Storage bucket, perform some operation on the data, and then write the modified data back to the Object Storage bucket.
To enable a function to access another Oracle Cloud Infrastructure resource, you have to include the function in a dynamic group, and then create a policy to grant the dynamic group access to that resource.
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsaccessingociresources.htm
NEW QUESTION # 54
What is the minimum amount of storage that a persistent volume claim can obtain In Oracle Cloud Infrastructure Container Engine for Kubemetes (OKE)?
- A. 10 GB
- B. 50 GB
- C. 1 TB
- D. 1 GB
Answer: B
Explanation:
Provisioning Persistent Volume Claims on the Block Volume Service:
Block volume quota: If you intend to create Kubernetes persistent volumes, sufficient block volume quota must be available in each availability domain to meet the persistent volume claim. Persistent volume claims must request a minimum of 50 gigabytes.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengcreatingpersistentvolumeclaim.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Concepts/contengprerequisites.htm
NEW QUESTION # 55
......
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