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NEW QUESTION 20
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 21
What is the minimum amount of storage that a persistent volume claim can obtain In Oracle Cloud Infrastructure Container Engine for Kubemetes (OKE)?
Answer: D
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 22
You are using Oracle Cloud Infrastructure (0CI) Resource Manager to manage your infrastructure lifecycle and wish to receive an email each time a Terraform action begins.
How should you use the OCI Events service to do this without writing any code?
Answer: B
Explanation:
Managing Topics and Subscriptions:
1. Create Notifications Topic and Subscription
If a suitable Notifications topic doesn't already exist, then you must log in to the Console as a tenancy administrator and create it. Whether you use an existing topic or create a new one, add an email address as a subscription so that you can monitor that email account for notifications
2. Using the Console to Create a Rule
Use the Console to create a rule with a pattern that matches bucket creation events emitted by Object Storage. Specify the Notifications topic you created as an action to deliver matching events. To test your rule, create a bucket. Object Storage emits an event which triggers the action. Check the email specified in the subscription to receive your notification
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Events/Concepts/eventsgetstarted.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Notification/Tasks/managingtopicsandsubscriptions.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Notification/Concepts/notificationoverview.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/Events/Concepts/filterevents.htm
https://docs.cloud.oracle.com/en-us/iaas/Content/ResourceManager/Tasks/managingstacksandjobs.htm
NEW QUESTION 23
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?
Answer: C
Explanation:
Application and systems logs can help you understand what is happening inside your cluster. The logs are particularly useful for debugging problems and monitoring cluster activity. Most modern applications have some kind of logging mechanism; as such, most container engines are likewise designed to support some kind of logging. The easiest and most embraced logging method for containerized applications is to write to the standard output and standard error streams.
Kubernetes also provides cluster-based logging to record container activity into a central logging subsystem. The standard output and standard error output of each container in a Kubernetes cluster can be ingested using an agent like Fluentd running on each node into tools like Elasticsearch and viewed with Kibana. And finally, monitor containers, pods, applications, services, and other components of your cluster. One can use tools such as Prometheus, Grafana, Jaeger for monitoring, visibility, and tracing the cluster.
References:
https://dzone.com/articles/5-best-security-practices-for-kubernetes-and-oracle-kubernetes-engine
https://kubernetes.io/docs/concepts/cluster-administration/logging/
https://blogs.oracle.com/developers/5-best-practices-for-kubernetes-security
NEW QUESTION 24
Which two handle Oracle Functions authentication automatically?
Answer: A,C
Explanation:
If you use the Fn Project CLI or the Oracle Cloud Infrastructure CLI to invoke a function, authentication is handled for you. See Using the Fn Project CLI to Invoke Functions and Using the Oracle Cloud Infrastructure CLI to Invoke Functions.
If you use an Oracle Cloud Infrastructure SDK to invoke a function, you can use the SDK to handle authentication. See Using SDKs to Invoke Functions.
If you make a signed HTTP request to a function's invoke endpoint, you'll have to handle authentication yourself by including a signature and the OCID of the compartment to which the function belongs in the request header Fn Project CLI you can create an Fn Project CLI Context to Connect to Oracle Cloud Infrastructure and specify --provider oracle This option enables Oracle Functions to perform authentication and authorization using Oracle Cloud Infrastructure request signing, private keys, user groups, and policies that grant permissions to those user groups.
References:
https://blogs.oracle.com/developers/oracle-functions-invoking-functions-automatically-with-cloud-events
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsinvokingfunctions.htm
NEW QUESTION 25
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