This page outlines steps to find out what container runtime the nodes in your cluster use. Depending on the way you run your cluster, the container runtime for the nodes may have been pre-configured or you need to configure it. If you're using a managed Kubernetes service, there might be vendor-specific ways to check what container runtime is configured for the nodes. The method described on this page should work whenever the execution of kubectl is allowed.

FEATURE STATE: Kubernetes v1.35 [alpha](disabled by default) Kubernetes nodes use declared features to report the availability of specific features that are new or feature-gated. Control plane components utilize this information to make better decisions. The kube-scheduler, via the NodeDeclaredFeatures plugin, ensures pods are only placed on nodes that explicitly support the features the pod requires. Additionally, the NodeDeclaredFeatureValidator admission controller validates pod updates against a node's declared features. This mechanism helps manage version skew and improve cluster stability, especially during cluster upgrades or in mixed-version environments where nodes might not all have the same features enabled.

Kubernetes is a portable, extensible, open source platform for managing containerized workloads and services that facilitate both declarative configuration and automation. It has a large, rapidly growing ecosystem. Kubernetes services, support, and tools are widely available.

Each object in your cluster has a Name that is unique for that type of resource. Every Kubernetes object also has a UID that is unique across your whole cluster. For example, you can only have one Pod named myapp-1234 within the same namespace, but you can have one Pod and one Deployment that are each named myapp-1234. For non-unique user-provided attributes, Kubernetes provides labels and annotations. Names A client-provided string that refers to an object in a resource URL, such as /api/v1/pods/some-name.

Kubernetes requires PKI certificates for authentication over TLS. If you install Kubernetes with kubeadm, the certificates that your cluster requires are automatically generated. You can also generate your own certificates -- for example, to keep your private keys more secure by not storing them on the API server. This page explains the certificates that your cluster requires. How certificates are used by your cluster Kubernetes requires PKI for the following operations:

Kubernetes objects are persistent entities in the Kubernetes system. Kubernetes uses these entities to represent the state of your cluster. Learn about the Kubernetes object model and how to work with these objects.

Field selectors let you select Kubernetes objects based on the value of one or more resource fields. Here are some examples of field selector queries: metadata.name=my-service metadata.namespace!=default status.phase=Pending This kubectl command selects all Pods for which the value of the status.phase field is Running: kubectl get pods --field-selector status.phase=Running Note:Field selectors are essentially resource filters. By default, no selectors/filters are applied, meaning that all resources of the specified type are selected.

The Kubernetes API lets you query and manipulate the state of objects in Kubernetes. The core of Kubernetes' control plane is the API server and the HTTP API that it exposes. Users, the different parts of your cluster, and external components all communicate with one another through the API server.

Gateway API is a family of API kinds that provide dynamic infrastructure provisioning and advanced traffic routing.

A time-to-live mechanism to clean up old Jobs that have finished execution.