[Yandex Cloud documentation](../../index.md) > [Yandex Managed Service for Kubernetes](../index.md) > FAQ > General questions

# General questions about Managed Service for Kubernetes

* [What services are available in Managed Service for Kubernetes clusters by default?](#defaults)

* [Which Kubernetes CLI (kubectl) version do I need to install for comprehensive cluster management?](#kubectl-version)

* [Can Yandex Cloud restore the health of my cluster if I configure it incorrectly?](#tech-support-cases)

* [Who will be monitoring the cluster health?](#health-check)

* [How quickly does Yandex Cloud address vulnerabilities discovered in the security system? What should I do if an attacker has taken advantage of a vulnerability and my data is compromised?](#security-updates)

* [Can I connect to a cluster node via OS Login, similar to a Yandex Cloud VM?](#connect-via-oslogin)

* [What operating system is used on cluster nodes?](#cluster-node-os)

* [Does Yandex Virtual Private Cloud support IPv6?](#ipv6-support)

#### What services are available in Managed Service for Kubernetes clusters by default? {#defaults}

The following services are available by default:
* [Metrics Server](https://github.com/kubernetes-sigs/metrics-server) for aggregating data on resource usage in a [Kubernetes cluster](../concepts/index.md#kubernetes-cluster).
* [Kubernetes plugin for CoreDNS](https://coredns.io/plugins/kubernetes/) for name resolution in a cluster.
* [DaemonSet](https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/) supporting [CSI plugins](https://github.com/container-storage-interface/spec) to work with [persistent volumes](../concepts/volume.md) (`PersistentVolume`).

#### Which Kubernetes CLI (kubectl) version do I need to install for comprehensive cluster management? {#kubectl-version}

We recommend using the latest official version of [kubectl](https://kubernetes.io/docs/tasks/tools/install-kubectl/) to avoid compatibility issues.

#### Can Yandex Cloud restore the health of my cluster if I configure it incorrectly? {#tech-support-cases}

The [master](../concepts/index.md#master) is fully managed by Yandex Cloud, so you cannot damage it. If you have issues with Kubernetes cluster components, contact [support](https://center.yandex.cloud/support).

#### Who will be monitoring the cluster health? {#health-check}

Yandex Cloud. We will monitor your cluster for corrupted file system, kernel deadlock, lost internet connection, and Kubernetes component issues. We are also developing a solution to automatically restore faulty components.

#### How quickly does Yandex Cloud address vulnerabilities discovered in the security system? What should I do if an attacker has taken advantage of a vulnerability and my data is compromised? {#security-updates}

Yandex Cloud services, images and master configuration undergo [various security and compliance checks](../../security/index.md) from the start.

Users can set the [update frequency](../concepts/release-channels-and-updates.md#updates) depending on their workloads and cluster configuration. It is important to consider attack vectors and the vulnerabilities of applications deployed in the Kubernetes cluster. Such factors as [network security policies](../concepts/network-policy.md) between applications, Docker container vulnerabilities, and improper container runtime configuration in the cluster may affect application security.

#### Can I connect to a cluster node via OS Login, similar to a Yandex Cloud VM? {#connect-via-oslogin}

Yes, you can. To do this, [follow this guide](../operations/node-connect-oslogin.md).

#### What operating system is used on cluster nodes? {#cluster-node-os}

Depending on the [update channel](../concepts/release-channels-and-updates.md) and Kubernetes version, cluster nodes come with pre-installed Ubuntu 20.04 or Ubuntu 22.04.

#### Does Yandex Virtual Private Cloud support IPv6? {#ipv6-support}

Yandex Virtual Private Cloud [does not support IPv6](../../vpc/concepts/network-overview.md#limits); however, IPv6 is on by default on cluster nodes at the OS level.