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kubernetes
2nd chunk of `content/en/docs/reference/_index.md`
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* [kubelet](/docs/reference/command-line-tools-reference/kubelet/) - The
  primary agent that runs on each node. The kubelet takes a set of PodSpecs
  and ensures that the described containers are running and healthy.
* [kube-apiserver](/docs/reference/command-line-tools-reference/kube-apiserver/) -
  REST API that validates and configures data for API objects such as  pods,
  services, replication controllers.
* [kube-controller-manager](/docs/reference/command-line-tools-reference/kube-controller-manager/) -
  Daemon that embeds the core control loops shipped with Kubernetes.
* [kube-proxy](/docs/reference/command-line-tools-reference/kube-proxy/) - Can
  do simple TCP/UDP stream forwarding or round-robin TCP/UDP forwarding across
  a set of back-ends.
* [kube-scheduler](/docs/reference/command-line-tools-reference/kube-scheduler/) -
  Scheduler that manages availability, performance, and capacity.
  
  * [Scheduler Policies](/docs/reference/scheduling/policies)
  * [Scheduler Profiles](/docs/reference/scheduling/config#profiles)

* List of [ports and protocols](/docs/reference/networking/ports-and-protocols/) that
  should be open on control plane and worker nodes

## Config APIs

This section hosts the documentation for "unpublished" APIs which are used to
configure  kubernetes components or tools. Most of these APIs are not exposed
by the API server in a RESTful way though they are essential for a user or an
operator to use or manage a cluster.


* [kubeconfig (v1)](/docs/reference/config-api/kubeconfig.v1/)
* [kuberc (v1alpha1)](/docs/reference/config-api/kuberc.v1alpha1/)
* [kube-apiserver admission (v1)](/docs/reference/config-api/apiserver-admission.v1/)
* [kube-apiserver configuration (v1alpha1)](/docs/reference/config-api/apiserver-config.v1alpha1/) and
* [kube-apiserver configuration (v1beta1)](/docs/reference/config-api/apiserver-config.v1beta1/) and
  [kube-apiserver configuration (v1)](/docs/reference/config-api/apiserver-config.v1/)
* [kube-apiserver event rate limit (v1alpha1)](/docs/reference/config-api/apiserver-eventratelimit.v1alpha1/)
Title: Kubernetes Core Components and Configuration APIs
Summary
This section details the core Kubernetes components, including kubelet (the node agent), kube-apiserver (the REST API server), kube-controller-manager (core control loops), kube-proxy (network proxy), and kube-scheduler (resource scheduler), along with links to their respective command-line tool references. It also lists the ports and protocols to open on control plane and worker nodes. Furthermore, it provides documentation for unpublished configuration APIs used to configure Kubernetes components, such as kubeconfig, kuberc, and kube-apiserver configurations for admission, general configuration, and event rate limiting.