Oracle 1z0-1084-22 Exam With Confidence Using Practice Dumps

After a new version of Kubernetes has been released and when Container Engine forKubernetes 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 ofKubernetes, 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 thendelete 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 podsstarting, 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.

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aas/Content/Streaming/Concepts/streamingoverview.htm

Building consumers to read and process messages from a stream using the GetMessages API .

How StreamingWorks:

The Streaming service provides a robust, scalable mechanism that you can use to produce and consume high volumes of data between application components.

Here's how Streaming works: a producer publishes messages to a stream, which is an append-only log. These messages are distributed among the partitions using the message's key.

Streams are divided into a number of partitions for scalability. Partitions allow you to distribute a stream by splitting messages across multiple nodes (or brokers). Each partition can be placed on a separate machine to allow multiple consumers to read a stream in parallel. Multiple consumers can read from any partition regardless of where the partition is hosted.

A consumer can read messages from one or more streams. Each message within a stream is marked with an offset value, so a consumer can pick up where it left off if it is interrupted.

You can use the Streaming service by:

A.Creating a stream using the Console or API.

B.Using a producer to publish data to the stream.

C.Building consumers to read and process messages from a stream using the GetMessages API . .

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Token-based authentication for the CLI:

Token-based authentication for the CLI allows customers to authenticate their session interactively, then use theCLI for a single session without an API signing key. This enables customers using an identity provider that is not SCIM-supported to use a federated user account with the CLI and SDKs.

Starting a Token-based CLI Session

To use token-based authenticationfor the CLI on a computer with a web browser:

1. In the CLI, run the following command. This will launch a web browser.

oci session authenticate

2. In the browser, enter your user credentials. This authentication information is saved to the .config file.

Validating a Token

To verify that a token is valid, run the following command:

oci session validate --config-file --profile --auth security_token

You should receive a message showing the expiration date for the session.If you receive an error, check your profile settings.

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