Cluster Roles

kubectl api-resources --namespaced=true

kubectl api-resources --namespaced=false

[Practice Test]

 

ㅁ How many ClusterRole do you see defined in the cluster?

kubectl get ClusterRoles --no-headers | wc -l

 

ㅁ How many ClusterRoleBindings exsit on the cluster?

kubectl get ClusterRoleBindings --no-header | wc -l

 

ㅁ What namespaces is the cluster-admin clusterrole part of?

kubectl describe ClusterRole cluster-admin

NAME            CREATED AT
cluster-admin   2021-03-29T13:15:58Z
controlplane $ kubectl describe clusterrole cluster-admin
Name:         cluster-admin
Labels:       kubernetes.io/bootstrapping=rbac-defaults
Annotations:  rbac.authorization.kubernetes.io/autoupdate: true
PolicyRule:
  Resources  Non-Resource URLs  Resource Names  Verbs
  ---------  -----------------  --------------  -----
  *.*        []                 []              [*]
             [*]                []              [*]

 

ㅁ What user/groups are the cluster-admin role b ound to?

The ClusterRoleBinding for the role is with the same name.

 

[kube-admin]

[cluster-admin]

[system:nodes]

[system:masters]

 

kubectl describe ClusterRoleBinding cluster-admin

Name:         cluster-admin
Labels:       kubernetes.io/bootstrapping=rbac-defaults
Annotations:  rbac.authorization.kubernetes.io/autoupdate: true
Role:
  Kind:  ClusterRole
  Name:  cluster-admin
Subjects:
  Kind   Name            Namespace
  ----   ----            ---------
  Group  system:masters  

 

ㅁ What level of permission does the cluster-admin role grant?

Inspect the cluster-admin role's privileges

 

[Pod level tasks only]

[Security related tasks only]

[Perform any action on any resource in the cluster]

[Node level tasks only]

 

ㅁ A new user michelle joined the team. She will be focusing on the nodes in the cluster. Create the required ClusterRoles and ClusterRoleBindings so she gets access to the nodes.

 

node-role.yaml

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: node-grantor
rules:
- apiGroups: [""]
  resources: ["nodes"]
  verbs: ["list", "get", "watch"]

michell-rolebinding.yaml

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: list-node-global
subjects:
- kind: User
  name: michelle
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: node-grantor
  apiGroup: rbac.authorization.k8s.io

ㅁ michelle's responsibilities are growing and now she will be responsible for storage as well. Create the required ClusterRoles and ClusterRoleBindings to allow her access to Storage.

Get the API group and resource names from command kubectl api-resource. Use the given spec.

 

- ClusterRole: storage-admin

- Resource: persistentvolumes

- Resource: storageclasses

- ClusterRoleBinding: michelle-storage-admin

- ClusterRoleBinding Subject: michelle

- ClusterRoleBinding Role: storage-admin

 

storage-admin-role.yaml

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: storage-admin
rules:
- apiGroups: [""]
  resources: ["persistentvolumes"]
  verbs: ["get", "watch", "list", "create", "delete"]
- apiGroups: ["storage.k8s.io"]
  resources: ["storageclasses"]
  verbs: ["get", "watch", "list", "create", "delete"]

michell-storage-rolebinding.yaml

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: michelle-storage-admin
subjects:
- kind: User
  name: michelle
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: storage-admin
  apiGroup: rbac.authorization.k8s.io

kubectl api-resources 

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