An overview of Kubernetes components

Component name	Control plane, worker node, or client
Kubeadm	Admin tool
Kube-apiserver	Control plane (master node)
Etcd	Control plane (master node)
Kube-scheduler	Control plane (master node)
Kube-controller-manager	Control plane (master node)
Kubelet	Worker node
Kube-proxy	Worker node
Container Engine	Worker node
kubectl	Client

Control panel

API server
etcd database
kube-scheduler
kube-controller-manager
cloud-controller-manager

Worker node components

kubelet
kube-proxy
Container runtime (Docker/CRI-O/containerd)

Interacting with the API server

CLI: kubectl
API: https://kubernetes.io/docs/concepts/overview/kubernetes-api

API Resources

NAME	SHORTNAMES	APIVERSION	NAMESPACED	KIND
bindings	v1	TRUE	Binding
componentstatuses	cs	v1	FALSE	ComponentStatus
configmaps	cm	v1	TRUE	ConfigMap
endpoints	ep	v1	TRUE	Endpoints
events	ev	v1	TRUE	Event
limitranges	limits	v1	TRUE	LimitRange
namespaces	ns	v1	FALSE	Namespace
nodes	no	v1	FALSE	Node
persistentvolumeclaims	pvc	v1	TRUE	PersistentVolumeClaim
persistentvolumes	pv	v1	FALSE	PersistentVolume
pods	po	v1	TRUE	Pod
podtemplates	v1	TRUE	PodTemplate
replicationcontrollers	rc	v1	TRUE	ReplicationController
resourcequotas	quota	v1	TRUE	ResourceQuota
secrets	v1	TRUE	Secret
serviceaccounts	sa	v1	TRUE	ServiceAccount
services	svc	v1	TRUE	Service
mutatingwebhookconfigurations	admissionregistration.k8s.io/v1	FALSE	MutatingWebhookConfiguration
validatingwebhookconfigurations	admissionregistration.k8s.io/v1	FALSE	ValidatingWebhookConfiguration
customresourcedefinitions	crd,crds	apiextensions.k8s.io/v1	FALSE	CustomResourceDefinition
apiservices	apiregistration.k8s.io/v1	FALSE	APIService
controllerrevisions	apps/v1	TRUE	ControllerRevision
daemonsets	ds	apps/v1	TRUE	DaemonSet
deployments	deploy	apps/v1	TRUE	Deployment
replicasets	rs	apps/v1	TRUE	ReplicaSet
statefulsets	sts	apps/v1	TRUE	StatefulSet
tokenreviews	authentication.k8s.io/v1	FALSE	TokenReview
localsubjectaccessreviews	authorization.k8s.io/v1	TRUE	LocalSubjectAccessReview
selfsubjectaccessreviews	authorization.k8s.io/v1	FALSE	SelfSubjectAccessReview
selfsubjectrulesreviews	authorization.k8s.io/v1	FALSE	SelfSubjectRulesReview
subjectaccessreviews	authorization.k8s.io/v1	FALSE	SubjectAccessReview
horizontalpodautoscalers	hpa	autoscaling/v2	TRUE	HorizontalPodAutoscaler
cronjobs	cj	batch/v1	TRUE	CronJob
jobs	batch/v1	TRUE	Job
certificatesigningrequests	csr	certificates.k8s.io/v1	FALSE	CertificateSigningRequest
leases	coordination.k8s.io/v1	TRUE	Lease
bgpconfigurations	crd.projectcalico.org/v1	FALSE	BGPConfiguration
bgppeers	crd.projectcalico.org/v1	FALSE	BGPPeer
blockaffinities	crd.projectcalico.org/v1	FALSE	BlockAffinity
caliconodestatuses	crd.projectcalico.org/v1	FALSE	CalicoNodeStatus
clusterinformations	crd.projectcalico.org/v1	FALSE	ClusterInformation
felixconfigurations	crd.projectcalico.org/v1	FALSE	FelixConfiguration
globalnetworkpolicies	crd.projectcalico.org/v1	FALSE	GlobalNetworkPolicy
globalnetworksets	crd.projectcalico.org/v1	FALSE	GlobalNetworkSet
hostendpoints	crd.projectcalico.org/v1	FALSE	HostEndpoint
ipamblocks	crd.projectcalico.org/v1	FALSE	IPAMBlock
ipamconfigs	crd.projectcalico.org/v1	FALSE	IPAMConfig
ipamhandles	crd.projectcalico.org/v1	FALSE	IPAMHandle
ippools	crd.projectcalico.org/v1	FALSE	IPPool
ipreservations	crd.projectcalico.org/v1	FALSE	IPReservation
kubecontrollersconfigurations	crd.projectcalico.org/v1	FALSE	KubeControllersConfiguration
networkpolicies	crd.projectcalico.org/v1	TRUE	NetworkPolicy
networksets	crd.projectcalico.org/v1	TRUE	NetworkSet
endpointslices	discovery.k8s.io/v1	TRUE	EndpointSlice
events	ev	events.k8s.io/v1	TRUE	Event
flowschemas	flowcontrol.apiserver.k8s.io/v1beta2	FALSE	FlowSchema
prioritylevelconfigurations	flowcontrol.apiserver.k8s.io/v1beta2	FALSE	PriorityLevelConfiguration
ingressclasses	networking.k8s.io/v1	FALSE	IngressClass
ingresses	ing	networking.k8s.io/v1	TRUE	Ingress
networkpolicies	netpol	networking.k8s.io/v1	TRUE	NetworkPolicy
runtimeclasses	node.k8s.io/v1	FALSE	RuntimeClass
poddisruptionbudgets	pdb	policy/v1	TRUE	PodDisruptionBudget
podsecuritypolicies	psp	policy/v1beta1	FALSE	PodSecurityPolicy
clusterrolebindings	rbac.authorization.k8s.io/v1	FALSE	ClusterRoleBinding
clusterroles	rbac.authorization.k8s.io/v1	FALSE	ClusterRole
rolebindings	rbac.authorization.k8s.io/v1	TRUE	RoleBinding
roles	rbac.authorization.k8s.io/v1	TRUE	Role
priorityclasses	pc	scheduling.k8s.io/v1	FALSE	PriorityClass
csidrivers	storage.k8s.io/v1	FALSE	CSIDriver
csinodes	storage.k8s.io/v1	FALSE	CSINode
csistoragecapacities	storage.k8s.io/v1beta1	TRUE	CSIStorageCapacity
storageclasses	sc	storage.k8s.io/v1	FALSE	StorageClass
volumeattachments	storage.k8s.io/v1	FALSE	VolumeAttachment

Reference

Kubernetes – An Enterprise Guide (Marc Boorshtein, Scott Surovich)
Certified Kubernetes Administrator (CKA) Study Guide (Benjamin Muschko)

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