Kubernetes lets you use a public key infrastructure (PKI) to authenticate to your cluster as a client. A few steps are required in order to get a normal user to be able to authenticate and invoke an API. First, this user must have an X.509 certificate issued by an authority that your Kubernetes cluster trusts. The client must then present that certificate to the Kubernetes API. You use a CertificateSigningRequest as part of this process, and either you or some other principal must approve the request.

FEATURE STATE: Kubernetes v1.32 [beta](enabled by default) On Linux nodes, Kubernetes 1.34 supports integrating with systemd to allow the operating system supervisor to recover a failed kubelet. This integration is not enabled by default. It can be used as an alternative to periodically requesting the kubelet's /healthz endpoint for health checks. If the kubelet does not respond to the watchdog within the timeout period, the watchdog will kill the kubelet.

kubeadm reset phase enables you to invoke atomic steps of the node reset process. Hence, you can let kubeadm do some of the work and you can fill in the gaps if you wish to apply customization. kubeadm reset phase is consistent with the kubeadm reset workflow, and behind the scene both use the same code. kubeadm reset phase phase Synopsis Use this command to invoke single phase of the "reset" workflow

Production-Grade Container Orchestration

kubeadm certs provides utilities for managing certificates. For more details on how these commands can be used, see Certificate Management with kubeadm. kubeadm certs A collection of operations for operating Kubernetes certificates. overview Synopsis Commands related to handling Kubernetes certificates kubeadm certs [flags] Options -h, --help help for certs Options inherited from parent commands --rootfs string The path to the 'real' host root filesystem. This will cause kubeadm to chroot into the provided path.

This is a list of articles and other pages that are either about the Kubernetes' deprecation and removal of dockershim, or about using CRI-compatible container runtimes, in connection with that removal. Kubernetes project Kubernetes blog: Dockershim Removal FAQ (originally published 2020/12/02) Kubernetes blog: Updated: Dockershim Removal FAQ (updated published 2022/02/17) Kubernetes blog: Kubernetes is Moving on From Dockershim: Commitments and Next Steps (published 2022/01/07) Kubernetes blog: Dockershim removal is coming.

Production-Grade Container Orchestration

kubeadm upgrade is a user-friendly command that wraps complex upgrading logic behind one command, with support for both planning an upgrade and actually performing it. kubeadm upgrade guidance The steps for performing an upgrade using kubeadm are outlined in this document. For older versions of kubeadm, please refer to older documentation sets of the Kubernetes website. You can use kubeadm upgrade diff to see the changes that would be applied to static pod manifests.

To allow Kubernetes workloads to use swap, on a Linux node, you must disable the kubelet's default behavior of failing when swap is detected, and specify memory-swap behavior as LimitedSwap: The available choices for swap behavior are: NoSwap (default) Workloads running as Pods on this node do not and cannot use swap. However, processes outside of Kubernetes' scope, such as system daemons (including the kubelet itself!) can utilize swap. This behavior is beneficial for protecting the node from system-level memory spikes, but it does not safeguard the workloads themselves from such spikes.

The status of a node in Kubernetes is a critical aspect of managing a Kubernetes cluster. In this article, we'll cover the basics of monitoring and maintaining node status to ensure a healthy and stable cluster. Node status fields A Node's status contains the following information: Addresses Conditions Capacity and Allocatable Info You can use kubectl to view a Node's status and other details: kubectl describe node <insert-node-name-here> Each section of the output is described below.