2V0-71.23 Exam Dumps : VMware Tanzu for Kubernetes Operations Professional

A rolling upgrade is a method of upgrading a Kubernetes cluster without downtime by gradually replacing nodes or components with newer versions. A rolling upgrade ensures that there is no disruption to the availability and functionality of the cluster during the upgrade process. A rolling upgrade can be performed manually or using tools such as kubeadm or kops5.

The other options are incorrect because:

• In-place upgrade of each node is a method of upgrading a Kubernetes cluster by stopping each node or component and updating it to the newer version. This method can cause downtime and disruption to the cluster during the upgrade process.
• Use canary upgrade is not a valid method of upgrading a Kubernetes cluster. A canary upgrade is a technique for deploying new versions of applications or services by gradually exposing them to a subset of users or traffic before rolling them out to everyone6. It is not applicable to cluster upgrades.
• Deploy a new cluster with upgraded Kubernetes release is not a method of upgrading a Kubernetes cluster, but rather creating a new one. This method canbe costly and time-consuming, as it requires migrating all the resources and configurations from the old cluster to the new one.

References: Upgrade A Cluster, Canary deployments

A prerequisite for cert-manager installation is to obtain the admin credentials of the target workload cluster. Cert-manager is a tool that automates the management and issuance of TLS certificates within Kubernetes clusters3. To install cert-manager, users need to have access to the cluster where they want to deploy it, and have the necessary permissions to create resources such as namespaces, custom resource definitions, deployments, services, and secrets3. Users can obtain the admin credentials of the target workload cluster by using the tanzu cluster kubeconfig get command with the --admin option4. This command generates a kubeconfig file that contains the admin credentials for the cluster, which can be used to authenticate with the cluster and perform cert-manager installation4. References: Installation - cert-manager Documentation, Deploy Workload Clusters - VMware Docs

The set of tools that can be used to attach a Kubernetes cluster to VMware Tanzu Mission Control are kubectl and VMware Tanzu Mission Control Web Ul. kubectl is a command-line tool that allows users to interact with Kubernetes clusters. VMware Tanzu Mission Control Web Ul is a graphical user interface that allows users to manage their clusters and policies. To attach a cluster, users need to use both tools. First, they need to use the web console to select the cluster group and generate a YAML manifest for the cluster. Then, they need to use kubectl to apply the manifest on the cluster and install the cluster agent extensions that enable communication with Tanzu Mission Control. References: Attach a Cluster - VMware Docs, What Happens When You Attach a Cluster