This page explains how to upgrade a Linux Worker Nodes created with kubeadm. Before you begin You need to have shell access to all the nodes, and the kubectl command-line tool must be configured to communicate with your cluster. It is recommended to run this tutorial on a cluster with at least two nodes that are not acting as control plane hosts. To check the version, enter kubectl version.

FEATURE STATE: Kubernetes v1.26 [alpha](disabled by default) This page shows how to migrate nodes to use event based updates for container status. The event-based implementation reduces node resource consumption by the kubelet, compared to the legacy approach that relies on polling. You may know this feature as evented Pod lifecycle event generator (PLEG). That's the name used internally within the Kubernetes project for a key implementation detail. The polling based approach is referred to as generic PLEG.

This page shows how to attach handlers to Container lifecycle events. Kubernetes supports the postStart and preStop events. Kubernetes sends the postStart event immediately after a Container is started, and it sends the preStop event immediately before the Container is terminated. A Container may specify one handler per event. Before you begin You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster.

This page describes the process of migrating from PodSecurityPolicies to the built-in PodSecurity admission controller. This can be done effectively using a combination of dry-run and audit and warn modes, although this becomes harder if mutating PSPs are used. Before you begin Your Kubernetes server must be at or later than version v1.22. To check the version, enter kubectl version. If you are currently running a version of Kubernetes other than 1.

This document helps you get started using the Kubernetes NetworkPolicy API to declare network policies that govern how pods communicate with each other. Note: This section links to third party projects that provide functionality required by Kubernetes. The Kubernetes project authors aren't responsible for these projects, which are listed alphabetically. To add a project to this list, read the content guide before submitting a change. More information. Before you begin You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster.

This page shows how to configure access to multiple clusters by using configuration files. After your clusters, users, and contexts are defined in one or more configuration files, you can quickly switch between clusters by using the kubectl config use-context command. Note:A file that is used to configure access to a cluster is sometimes called a kubeconfig file. This is a generic way of referring to configuration files. It does not mean that there is a file named kubeconfig.

FEATURE STATE: Kubernetes v1.31 [stable](enabled by default) This document shows you how to use the Pod failure policy, in combination with the default Pod backoff failure policy, to improve the control over the handling of container- or Pod-level failure within a Job. The definition of Pod failure policy may help you to: better utilize the computational resources by avoiding unnecessary Pod retries. avoid Job failures due to Pod disruptions (such preemption, API-initiated eviction or taint-based eviction).

Automatically provision and consolidate the Nodes in your cluster to adapt to demand and optimize cost.

When using client certificate authentication, you can generate certificates manually through easyrsa, openssl or cfssl. easyrsa easyrsa can manually generate certificates for your cluster. Download, unpack, and initialize the patched version of easyrsa3. curl -LO https://dl.k8s.io/easy-rsa/easy-rsa.tar.gz tar xzf easy-rsa.tar.gz cd easy-rsa-master/easyrsa3 ./easyrsa init-pki Generate a new certificate authority (CA). --batch sets automatic mode; --req-cn specifies the Common Name (CN) for the CA's new root certificate. ./easyrsa --batch "--req-cn=${MASTER_IP}@`date +%s`" build-ca nopass Generate server certificate and key.

Define a default memory resource limit for a namespace, so that every new Pod in that namespace has a memory resource limit configured.