Kubernetes

Kubernetes kubectl api-resources コマンドでAPI リソースを調べてみる

概要

kubectl api-resources は、クラスター内で利用できるすべてのリソースの完全なリストを表示するコマンドです

コマンド

kubectl api-resources

どんなことがわかる

  • コマンドの省略(SHORTNAMES)がわかる
  • Deployment 等のマニフェストファイルの、apiVersion、kindの値がわかる
  • ネームスペースに紐づいているリソースを確認できる

オプション

help を確認するといくつかのオプションがあるみたいですね。

$ kubectl api-resources --help
Print the supported API resources on the server.

Examples:
  # Print the supported API resources
  kubectl api-resources

  # Print the supported API resources with more information
  kubectl api-resources -o wide

  # Print the supported API resources sorted by a column
  kubectl api-resources --sort-by=name

  # Print the supported namespaced resources
  kubectl api-resources --namespaced=true

  # Print the supported non-namespaced resources
  kubectl api-resources --namespaced=false

  # Print the supported API resources with a specific APIGroup
  kubectl api-resources --api-group=extensions

Options:
      --api-group='': Limit to resources in the specified API group.
      --cached=false: Use the cached list of resources if available.
      --namespaced=true: If false, non-namespaced resources will be returned, otherwise returning namespaced resources
by default.
      --no-headers=false: When using the default or custom-column output format, don't print headers (default print
headers).
  -o, --output='': Output format. One of: wide|name.
      --sort-by='': If non-empty, sort list of resources using specified field. The field can be either 'name' or
'kind'.
      --verbs=[]: Limit to resources that support the specified verbs.

Usage:
  kubectl api-resources [flags] [options]

Use "kubectl options" for a list of global command-line options (applies to all commands).
$

コマンド 実行結果

以下からはコマンドを実行したらどうなるのかを見ていきます。

kubectl api-resources

サポートされている API リソースをすべてを表示
実行結果の「SHORTNAMES」を見ると、コマンドお省略形がわかる。
例えば、「persistentvolumeclaims」が3単語の「pvc」とかになり、かなり便利!

vagrant@kubemaster:~$
vagrant@kubemaster:~$ kubectl 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
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
nodes                                          metrics.k8s.io/v1beta1                 false        NodeMetrics
pods                                           metrics.k8s.io/v1beta1                 true         PodMetrics
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
vagrant@kubemaster:~$

kubectl api-resources -o wide

サポートされている API リソースと詳細情報を出力します
実行結果に「VERBS」の列が追加されてますね。

NAME                              SHORTNAMES   APIVERSION                             NAMESPACED   KIND                             VERBS
bindings                                       v1                                     true         Binding                          [create]
componentstatuses                 cs           v1                                     false        ComponentStatus                  [get list]
configmaps                        cm           v1                                     true         ConfigMap                        [create delete deletecollection get list patch update watch]
endpoints                         ep           v1                                     true         Endpoints                        [create delete deletecollection get list patch update watch]
events                            ev           v1                                     true         Event                            [create delete deletecollection get list patch update watch]
limitranges                       limits       v1                                     true         LimitRange                       [create delete deletecollection get list patch update watch]
namespaces                        ns           v1                                     false        Namespace                        [create delete get list patch update watch]
nodes                             no           v1                                     false        Node                             [create delete deletecollection get list patch update watch]
persistentvolumeclaims            pvc          v1                                     true         PersistentVolumeClaim            [create delete deletecollection get list patch update watch]
persistentvolumes                 pv           v1                                     false        PersistentVolume                 [create delete deletecollection get list patch update watch]
pods                              po           v1                                     true         Pod                              [create delete deletecollection get list patch update watch]
podtemplates                                   v1                                     true         PodTemplate                      [create delete deletecollection get list patch update watch]
replicationcontrollers            rc           v1                                     true         ReplicationController            [create delete deletecollection get list patch update watch]
resourcequotas                    quota        v1                                     true         ResourceQuota                    [create delete deletecollection get list patch update watch]
secrets                                        v1                                     true         Secret                           [create delete deletecollection get list patch update watch]
serviceaccounts                   sa           v1                                     true         ServiceAccount                   [create delete deletecollection get list patch update watch]
services                          svc          v1                                     true         Service                          [create delete deletecollection get list patch update watch]
mutatingwebhookconfigurations                  admissionregistration.k8s.io/v1        false        MutatingWebhookConfiguration     [create delete deletecollection get list patch update watch]
validatingwebhookconfigurations                admissionregistration.k8s.io/v1        false        ValidatingWebhookConfiguration   [create delete deletecollection get list patch update watch]
customresourcedefinitions         crd,crds     apiextensions.k8s.io/v1                false        CustomResourceDefinition         [create delete deletecollection get list patch update watch]
apiservices                                    apiregistration.k8s.io/v1              false        APIService                       [create delete deletecollection get list patch update watch]
controllerrevisions                            apps/v1                                true         ControllerRevision               [create delete deletecollection get list patch update watch]
daemonsets                        ds           apps/v1                                true         DaemonSet                        [create delete deletecollection get list patch update watch]
deployments                       deploy       apps/v1                                true         Deployment                       [create delete deletecollection get list patch update watch]
replicasets                       rs           apps/v1                                true         ReplicaSet                       [create delete deletecollection get list patch update watch]
statefulsets                      sts          apps/v1                                true         StatefulSet                      [create delete deletecollection get list patch update watch]
tokenreviews                                   authentication.k8s.io/v1               false        TokenReview                      [create]
localsubjectaccessreviews                      authorization.k8s.io/v1                true         LocalSubjectAccessReview         [create]
selfsubjectaccessreviews                       authorization.k8s.io/v1                false        SelfSubjectAccessReview          [create]
selfsubjectrulesreviews                        authorization.k8s.io/v1                false        SelfSubjectRulesReview           [create]
subjectaccessreviews                           authorization.k8s.io/v1                false        SubjectAccessReview              [create]
horizontalpodautoscalers          hpa          autoscaling/v2                         true         HorizontalPodAutoscaler          [create delete deletecollection get list patch update watch]
cronjobs                          cj           batch/v1                               true         CronJob                          [create delete deletecollection get list patch update watch]
jobs                                           batch/v1                               true         Job                              [create delete deletecollection get list patch update watch]
certificatesigningrequests        csr          certificates.k8s.io/v1                 false        CertificateSigningRequest        [create delete deletecollection get list patch update watch]
leases                                         coordination.k8s.io/v1                 true         Lease                            [create delete deletecollection get list patch update watch]
endpointslices                                 discovery.k8s.io/v1                    true         EndpointSlice                    [create delete deletecollection get list patch update watch]
events                            ev           events.k8s.io/v1                       true         Event                            [create delete deletecollection get list patch update watch]
flowschemas                                    flowcontrol.apiserver.k8s.io/v1beta2   false        FlowSchema                       [create delete deletecollection get list patch update watch]
prioritylevelconfigurations                    flowcontrol.apiserver.k8s.io/v1beta2   false        PriorityLevelConfiguration       [create delete deletecollection get list patch update watch]
nodes                                          metrics.k8s.io/v1beta1                 false        NodeMetrics                      [get list]
pods                                           metrics.k8s.io/v1beta1                 true         PodMetrics                       [get list]
ingressclasses                                 networking.k8s.io/v1                   false        IngressClass                     [create delete deletecollection get list patch update watch]
ingresses                         ing          networking.k8s.io/v1                   true         Ingress                          [create delete deletecollection get list patch update watch]
networkpolicies                   netpol       networking.k8s.io/v1                   true         NetworkPolicy                    [create delete deletecollection get list patch update watch]
runtimeclasses                                 node.k8s.io/v1                         false        RuntimeClass                     [create delete deletecollection get list patch update watch]
poddisruptionbudgets              pdb          policy/v1                              true         PodDisruptionBudget              [create delete deletecollection get list patch update watch]
podsecuritypolicies               psp          policy/v1beta1                         false        PodSecurityPolicy                [create delete deletecollection get list patch update watch]
clusterrolebindings                            rbac.authorization.k8s.io/v1           false        ClusterRoleBinding               [create delete deletecollection get list patch update watch]
clusterroles                                   rbac.authorization.k8s.io/v1           false        ClusterRole                      [create delete deletecollection get list patch update watch]
rolebindings                                   rbac.authorization.k8s.io/v1           true         RoleBinding                      [create delete deletecollection get list patch update watch]
roles                                          rbac.authorization.k8s.io/v1           true         Role                             [create delete deletecollection get list patch update watch]
priorityclasses                   pc           scheduling.k8s.io/v1                   false        PriorityClass                    [create delete deletecollection get list patch update watch]
csidrivers                                     storage.k8s.io/v1                      false        CSIDriver                        [create delete deletecollection get list patch update watch]
csinodes                                       storage.k8s.io/v1                      false        CSINode                          [create delete deletecollection get list patch update watch]
csistoragecapacities                           storage.k8s.io/v1beta1                 true         CSIStorageCapacity               [create delete deletecollection get list patch update watch]
storageclasses                    sc           storage.k8s.io/v1                      false        StorageClass                     [create delete deletecollection get list patch update watch]
volumeattachments                              storage.k8s.io/v1                      false        VolumeAttachment                 [create delete deletecollection get list patch update watch]
vagrant@kubemaster:~$

kubectl api-resources --sort-by=name

サポートされている API リソースを列でソートして出力します
例は「name」でソートしているので、NAMEがアルファベット順になってます。

vagrant@kubemaster:~$ kubectl api-resources --sort-by=name
NAME                              SHORTNAMES   APIVERSION                             NAMESPACED   KIND
apiservices                                    apiregistration.k8s.io/v1              false        APIService
bindings                                       v1                                     true         Binding
certificatesigningrequests        csr          certificates.k8s.io/v1                 false        CertificateSigningRequest
clusterrolebindings                            rbac.authorization.k8s.io/v1           false        ClusterRoleBinding
clusterroles                                   rbac.authorization.k8s.io/v1           false        ClusterRole
componentstatuses                 cs           v1                                     false        ComponentStatus
configmaps                        cm           v1                                     true         ConfigMap
controllerrevisions                            apps/v1                                true         ControllerRevision
cronjobs                          cj           batch/v1                               true         CronJob
csidrivers                                     storage.k8s.io/v1                      false        CSIDriver
csinodes                                       storage.k8s.io/v1                      false        CSINode
csistoragecapacities                           storage.k8s.io/v1beta1                 true         CSIStorageCapacity
customresourcedefinitions         crd,crds     apiextensions.k8s.io/v1                false        CustomResourceDefinition
daemonsets                        ds           apps/v1                                true         DaemonSet
deployments                       deploy       apps/v1                                true         Deployment
endpoints                         ep           v1                                     true         Endpoints
endpointslices                                 discovery.k8s.io/v1                    true         EndpointSlice
events                            ev           v1                                     true         Event
events                            ev           events.k8s.io/v1                       true         Event
flowschemas                                    flowcontrol.apiserver.k8s.io/v1beta2   false        FlowSchema
horizontalpodautoscalers          hpa          autoscaling/v2                         true         HorizontalPodAutoscaler
ingressclasses                                 networking.k8s.io/v1                   false        IngressClass
ingresses                         ing          networking.k8s.io/v1                   true         Ingress
jobs                                           batch/v1                               true         Job
leases                                         coordination.k8s.io/v1                 true         Lease
limitranges                       limits       v1                                     true         LimitRange
localsubjectaccessreviews                      authorization.k8s.io/v1                true         LocalSubjectAccessReview
mutatingwebhookconfigurations                  admissionregistration.k8s.io/v1        false        MutatingWebhookConfiguration
namespaces                        ns           v1                                     false        Namespace
networkpolicies                   netpol       networking.k8s.io/v1                   true         NetworkPolicy
nodes                             no           v1                                     false        Node
nodes                                          metrics.k8s.io/v1beta1                 false        NodeMetrics
persistentvolumeclaims            pvc          v1                                     true         PersistentVolumeClaim
persistentvolumes                 pv           v1                                     false        PersistentVolume
poddisruptionbudgets              pdb          policy/v1                              true         PodDisruptionBudget
pods                              po           v1                                     true         Pod
pods                                           metrics.k8s.io/v1beta1                 true         PodMetrics
podsecuritypolicies               psp          policy/v1beta1                         false        PodSecurityPolicy
podtemplates                                   v1                                     true         PodTemplate
priorityclasses                   pc           scheduling.k8s.io/v1                   false        PriorityClass
prioritylevelconfigurations                    flowcontrol.apiserver.k8s.io/v1beta2   false        PriorityLevelConfiguration
replicasets                       rs           apps/v1                                true         ReplicaSet
replicationcontrollers            rc           v1                                     true         ReplicationController
resourcequotas                    quota        v1                                     true         ResourceQuota
rolebindings                                   rbac.authorization.k8s.io/v1           true         RoleBinding
roles                                          rbac.authorization.k8s.io/v1           true         Role
runtimeclasses                                 node.k8s.io/v1                         false        RuntimeClass
secrets                                        v1                                     true         Secret
selfsubjectaccessreviews                       authorization.k8s.io/v1                false        SelfSubjectAccessReview
selfsubjectrulesreviews                        authorization.k8s.io/v1                false        SelfSubjectRulesReview
serviceaccounts                   sa           v1                                     true         ServiceAccount
services                          svc          v1                                     true         Service
statefulsets                      sts          apps/v1                                true         StatefulSet
storageclasses                    sc           storage.k8s.io/v1                      false        StorageClass
subjectaccessreviews                           authorization.k8s.io/v1                false        SubjectAccessReview
tokenreviews                                   authentication.k8s.io/v1               false        TokenReview
validatingwebhookconfigurations                admissionregistration.k8s.io/v1        false        ValidatingWebhookConfiguration
volumeattachments                              storage.k8s.io/v1                      false        VolumeAttachment
vagrant@kubemaster:~$

kubectl api-resources --namespaced=true

サポートされている名前空間リソースを出力します
「namespaces」に紐づいているリソース一覧ですね。
例えば、namespaces でリソース分けていた場合、これに紐づいているリソースは
「kubectl -namespaces XXXXX」とXXXXXでネームスペースを指定しないとリソースが表示されないです。

vagrant@kubemaster:~$ kubectl api-resources --namespaced=true
NAME                        SHORTNAMES   APIVERSION                     NAMESPACED   KIND
bindings                                 v1                             true         Binding
configmaps                  cm           v1                             true         ConfigMap
endpoints                   ep           v1                             true         Endpoints
events                      ev           v1                             true         Event
limitranges                 limits       v1                             true         LimitRange
persistentvolumeclaims      pvc          v1                             true         PersistentVolumeClaim
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
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
localsubjectaccessreviews                authorization.k8s.io/v1        true         LocalSubjectAccessReview
horizontalpodautoscalers    hpa          autoscaling/v2                 true         HorizontalPodAutoscaler
cronjobs                    cj           batch/v1                       true         CronJob
jobs                                     batch/v1                       true         Job
leases                                   coordination.k8s.io/v1         true         Lease
endpointslices                           discovery.k8s.io/v1            true         EndpointSlice
events                      ev           events.k8s.io/v1               true         Event
pods                                     metrics.k8s.io/v1beta1         true         PodMetrics
ingresses                   ing          networking.k8s.io/v1           true         Ingress
networkpolicies             netpol       networking.k8s.io/v1           true         NetworkPolicy
poddisruptionbudgets        pdb          policy/v1                      true         PodDisruptionBudget
rolebindings                             rbac.authorization.k8s.io/v1   true         RoleBinding
roles                                    rbac.authorization.k8s.io/v1   true         Role
csistoragecapacities                     storage.k8s.io/v1beta1         true         CSIStorageCapacity
vagrant@kubemaster:~$

kubectl api-resources --namespaced=false

サポートされている名前空間のないリソースを出力するコマンド
namespaces に紐づいていないリソースですね。

例えば、persistentvolumes などが該当します。

vagrant@kubemaster:~$ kubectl api-resources --namespaced=false
NAME                              SHORTNAMES   APIVERSION                             NAMESPACED   KIND
componentstatuses                 cs           v1                                     false        ComponentStatus
namespaces                        ns           v1                                     false        Namespace
nodes                             no           v1                                     false        Node
persistentvolumes                 pv           v1                                     false        PersistentVolume
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
tokenreviews                                   authentication.k8s.io/v1               false        TokenReview
selfsubjectaccessreviews                       authorization.k8s.io/v1                false        SelfSubjectAccessReview
selfsubjectrulesreviews                        authorization.k8s.io/v1                false        SelfSubjectRulesReview
subjectaccessreviews                           authorization.k8s.io/v1                false        SubjectAccessReview
certificatesigningrequests        csr          certificates.k8s.io/v1                 false        CertificateSigningRequest
flowschemas                                    flowcontrol.apiserver.k8s.io/v1beta2   false        FlowSchema
prioritylevelconfigurations                    flowcontrol.apiserver.k8s.io/v1beta2   false        PriorityLevelConfiguration
nodes                                          metrics.k8s.io/v1beta1                 false        NodeMetrics
ingressclasses                                 networking.k8s.io/v1                   false        IngressClass
runtimeclasses                                 node.k8s.io/v1                         false        RuntimeClass
podsecuritypolicies               psp          policy/v1beta1                         false        PodSecurityPolicy
clusterrolebindings                            rbac.authorization.k8s.io/v1           false        ClusterRoleBinding
clusterroles                                   rbac.authorization.k8s.io/v1           false        ClusterRole
priorityclasses                   pc           scheduling.k8s.io/v1                   false        PriorityClass
csidrivers                                     storage.k8s.io/v1                      false        CSIDriver
csinodes                                       storage.k8s.io/v1                      false        CSINode
storageclasses                    sc           storage.k8s.io/v1                      false        StorageClass
volumeattachments                              storage.k8s.io/v1                      false        VolumeAttachment
vagrant@kubemaster:~$

サポートされている API リソースを特定の APIGroup で出力します

サポートされている API リソースを特定の APIGroup で出力します
helpの例のまま実行すると、ヘッダしか表示されませんので、
「apps」に絞った結果を書いてます。

グループは「APIVERSION」列で確認できます。
例えば、「apps/v1」だとグループは「apps」です

vagrant@kubemaster:~$ kubectl api-resources --api-group=extensions
NAME   SHORTNAMES   APIVERSION   NAMESPACED   KIND
vagrant@kubemaster:~$

vagrant@kubemaster:~$ kubectl api-resources --api-group=apps
NAME                  SHORTNAMES   APIVERSION   NAMESPACED   KIND
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
vagrant@kubemaster:~$

参考情報

kubectlリファレンスドキュメント
https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#api-resources

Kubernetes API
https://kubernetes.io/ja/docs/concepts/overview/kubernetes-api/

APIグループ
https://kubernetes.io/ja/docs/reference/using-api/#api%E3%82%B0%E3%83%AB%E3%83%BC%E3%83%97

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