Red Hat Training

A Red Hat training course is available for OpenShift Container Platform

第8章 ロールベースアクセス制御 (RBAC) の管理

8.1. 概要

You can use the CLI to view RBAC resources and the administrator CLI to manage the roles and bindings.

8.2. Viewing Roles and Bindings

Roles can be used to grant various levels of access both cluster-wide as well as at the project-scope. Users and groups can be associated with, or bound to, multiple roles at the same time. You can view details about the roles and their bindings using the oc describe command.

Users with the cluster-admindefault cluster role bound cluster-wide can perform any action on any resource. Users with the admin default cluster role bound locally can manage roles and bindings in that project.

注記

Review a full list of verbs in the Evaluating Authorization section.

8.2.1. Viewing Cluster Roles

クラスターロールおよびそれらの関連付けられたルールセットを表示するには、以下を実行します。 

$ oc describe clusterrole.rbac

Viewing Cluster Roles

$ oc describe clusterrole.rbac
Name:		admin
Labels:		<none>
Annotations:	openshift.io/description=A user that has edit rights within the project and can change the project's membership.
		rbac.authorization.kubernetes.io/autoupdate=true
PolicyRule:
  Resources							Non-Resource URLs	Resource Names	Verbs
  ---------							-----------------	--------------	-----
  appliedclusterresourcequotas					[]			[]		[get list watch]
  appliedclusterresourcequotas.quota.openshift.io		[]			[]		[get list watch]
  bindings							[]			[]		[get list watch]
  buildconfigs							[]			[]		[create delete deletecollection get list patch update watch]
  buildconfigs.build.openshift.io				[]			[]		[create delete deletecollection get list patch update watch]
  buildconfigs/instantiate					[]			[]		[create]
  buildconfigs.build.openshift.io/instantiate			[]			[]		[create]
  buildconfigs/instantiatebinary				[]			[]		[create]
  buildconfigs.build.openshift.io/instantiatebinary		[]			[]		[create]
  buildconfigs/webhooks						[]			[]		[create delete deletecollection get list patch update watch]
  buildconfigs.build.openshift.io/webhooks			[]			[]		[create delete deletecollection get list patch update watch]
  buildlogs							[]			[]		[create delete deletecollection get list patch update watch]
  buildlogs.build.openshift.io					[]			[]		[create delete deletecollection get list patch update watch]
  builds							[]			[]		[create delete deletecollection get list patch update watch]
  builds.build.openshift.io					[]			[]		[create delete deletecollection get list patch update watch]
  builds/clone							[]			[]		[create]
  builds.build.openshift.io/clone				[]			[]		[create]
  builds/details						[]			[]		[update]
  builds.build.openshift.io/details				[]			[]		[update]
  builds/log							[]			[]		[get list watch]
  builds.build.openshift.io/log					[]			[]		[get list watch]
  configmaps							[]			[]		[create delete deletecollection get list patch update watch]
  cronjobs.batch						[]			[]		[create delete deletecollection get list patch update watch]
  daemonsets.extensions						[]			[]		[get list watch]
  deploymentconfigrollbacks					[]			[]		[create]
  deploymentconfigrollbacks.apps.openshift.io			[]			[]		[create]
  deploymentconfigs						[]			[]		[create delete deletecollection get list patch update watch]
  deploymentconfigs.apps.openshift.io				[]			[]		[create delete deletecollection get list patch update watch]
  deploymentconfigs/instantiate					[]			[]		[create]
  deploymentconfigs.apps.openshift.io/instantiate		[]			[]		[create]
  deploymentconfigs/log						[]			[]		[get list watch]
  deploymentconfigs.apps.openshift.io/log			[]			[]		[get list watch]
  deploymentconfigs/rollback					[]			[]		[create]
  deploymentconfigs.apps.openshift.io/rollback			[]			[]		[create]
  deploymentconfigs/scale					[]			[]		[create delete deletecollection get list patch update watch]
  deploymentconfigs.apps.openshift.io/scale			[]			[]		[create delete deletecollection get list patch update watch]
  deploymentconfigs/status					[]			[]		[get list watch]
  deploymentconfigs.apps.openshift.io/status			[]			[]		[get list watch]
  deployments.apps						[]			[]		[create delete deletecollection get list patch update watch]
  deployments.extensions					[]			[]		[create delete deletecollection get list patch update watch]
  deployments.extensions/rollback				[]			[]		[create delete deletecollection get list patch update watch]
  deployments.apps/scale					[]			[]		[create delete deletecollection get list patch update watch]
  deployments.extensions/scale					[]			[]		[create delete deletecollection get list patch update watch]
  deployments.apps/status					[]			[]		[create delete deletecollection get list patch update watch]
  endpoints							[]			[]		[create delete deletecollection get list patch update watch]
  events							[]			[]		[get list watch]
  horizontalpodautoscalers.autoscaling				[]			[]		[create delete deletecollection get list patch update watch]
  horizontalpodautoscalers.extensions				[]			[]		[create delete deletecollection get list patch update watch]
  imagestreamimages						[]			[]		[create delete deletecollection get list patch update watch]
  imagestreamimages.image.openshift.io				[]			[]		[create delete deletecollection get list patch update watch]
  imagestreamimports						[]			[]		[create]
  imagestreamimports.image.openshift.io				[]			[]		[create]
  imagestreammappings						[]			[]		[create delete deletecollection get list patch update watch]
  imagestreammappings.image.openshift.io			[]			[]		[create delete deletecollection get list patch update watch]
  imagestreams							[]			[]		[create delete deletecollection get list patch update watch]
  imagestreams.image.openshift.io				[]			[]		[create delete deletecollection get list patch update watch]
  imagestreams/layers						[]			[]		[get update]
  imagestreams.image.openshift.io/layers			[]			[]		[get update]
  imagestreams/secrets						[]			[]		[create delete deletecollection get list patch update watch]
  imagestreams.image.openshift.io/secrets			[]			[]		[create delete deletecollection get list patch update watch]
  imagestreams/status						[]			[]		[get list watch]
  imagestreams.image.openshift.io/status			[]			[]		[get list watch]
  imagestreamtags						[]			[]		[create delete deletecollection get list patch update watch]
  imagestreamtags.image.openshift.io				[]			[]		[create delete deletecollection get list patch update watch]
  jenkins.build.openshift.io					[]			[]		[admin edit view]
  jobs.batch							[]			[]		[create delete deletecollection get list patch update watch]
  limitranges							[]			[]		[get list watch]
  localresourceaccessreviews					[]			[]		[create]
  localresourceaccessreviews.authorization.openshift.io		[]			[]		[create]
  localsubjectaccessreviews					[]			[]		[create]
  localsubjectaccessreviews.authorization.k8s.io		[]			[]		[create]
  localsubjectaccessreviews.authorization.openshift.io		[]			[]		[create]
  namespaces							[]			[]		[get list watch]
  namespaces/status						[]			[]		[get list watch]
  networkpolicies.extensions					[]			[]		[create delete deletecollection get list patch update watch]
  persistentvolumeclaims					[]			[]		[create delete deletecollection get list patch update watch]
  pods								[]			[]		[create delete deletecollection get list patch update watch]
  pods/attach							[]			[]		[create delete deletecollection get list patch update watch]
  pods/exec							[]			[]		[create delete deletecollection get list patch update watch]
  pods/log							[]			[]		[get list watch]
  pods/portforward						[]			[]		[create delete deletecollection get list patch update watch]
  pods/proxy							[]			[]		[create delete deletecollection get list patch update watch]
  pods/status							[]			[]		[get list watch]
  podsecuritypolicyreviews					[]			[]		[create]
  podsecuritypolicyreviews.security.openshift.io		[]			[]		[create]
  podsecuritypolicyselfsubjectreviews				[]			[]		[create]
  podsecuritypolicyselfsubjectreviews.security.openshift.io	[]			[]		[create]
  podsecuritypolicysubjectreviews				[]			[]		[create]
  podsecuritypolicysubjectreviews.security.openshift.io		[]			[]		[create]
  processedtemplates						[]			[]		[create delete deletecollection get list patch update watch]
  processedtemplates.template.openshift.io			[]			[]		[create delete deletecollection get list patch update watch]
  projects							[]			[]		[delete get patch update]
  projects.project.openshift.io					[]			[]		[delete get patch update]
  replicasets.extensions					[]			[]		[create delete deletecollection get list patch update watch]
  replicasets.extensions/scale					[]			[]		[create delete deletecollection get list patch update watch]
  replicationcontrollers					[]			[]		[create delete deletecollection get list patch update watch]
  replicationcontrollers/scale					[]			[]		[create delete deletecollection get list patch update watch]
  replicationcontrollers.extensions/scale			[]			[]		[create delete deletecollection get list patch update watch]
  replicationcontrollers/status					[]			[]		[get list watch]
  resourceaccessreviews						[]			[]		[create]
  resourceaccessreviews.authorization.openshift.io		[]			[]		[create]
  resourcequotas						[]			[]		[get list watch]
  resourcequotas/status						[]			[]		[get list watch]
  resourcequotausages						[]			[]		[get list watch]
  rolebindingrestrictions					[]			[]		[get list watch]
  rolebindingrestrictions.authorization.openshift.io		[]			[]		[get list watch]
  rolebindings							[]			[]		[create delete deletecollection get list patch update watch]
  rolebindings.authorization.openshift.io			[]			[]		[create delete deletecollection get list patch update watch]
  rolebindings.rbac.authorization.k8s.io			[]			[]		[create delete deletecollection get list patch update watch]
  roles								[]			[]		[create delete deletecollection get list patch update watch]
  roles.authorization.openshift.io				[]			[]		[create delete deletecollection get list patch update watch]
  roles.rbac.authorization.k8s.io				[]			[]		[create delete deletecollection get list patch update watch]
  routes							[]			[]		[create delete deletecollection get list patch update watch]
  routes.route.openshift.io					[]			[]		[create delete deletecollection get list patch update watch]
  routes/custom-host						[]			[]		[create]
  routes.route.openshift.io/custom-host				[]			[]		[create]
  routes/status							[]			[]		[get list watch update]
  routes.route.openshift.io/status				[]			[]		[get list watch update]
  scheduledjobs.batch						[]			[]		[create delete deletecollection get list patch update watch]
  secrets							[]			[]		[create delete deletecollection get list patch update watch]
  serviceaccounts						[]			[]		[create delete deletecollection get list patch update watch impersonate]
  services							[]			[]		[create delete deletecollection get list patch update watch]
  services/proxy						[]			[]		[create delete deletecollection get list patch update watch]
  statefulsets.apps						[]			[]		[create delete deletecollection get list patch update watch]
  subjectaccessreviews						[]			[]		[create]
  subjectaccessreviews.authorization.openshift.io		[]			[]		[create]
  subjectrulesreviews						[]			[]		[create]
  subjectrulesreviews.authorization.openshift.io		[]			[]		[create]
  templateconfigs						[]			[]		[create delete deletecollection get list patch update watch]
  templateconfigs.template.openshift.io				[]			[]		[create delete deletecollection get list patch update watch]
  templateinstances						[]			[]		[create delete deletecollection get list patch update watch]
  templateinstances.template.openshift.io			[]			[]		[create delete deletecollection get list patch update watch]
  templates							[]			[]		[create delete deletecollection get list patch update watch]
  templates.template.openshift.io				[]			[]		[create delete deletecollection get list patch update watch]


Name:		basic-user
Labels:		<none>
Annotations:	openshift.io/description=A user that can get basic information about projects.
		rbac.authorization.kubernetes.io/autoupdate=true
PolicyRule:
  Resources						Non-Resource URLs	Resource Names	Verbs
  ---------						-----------------	--------------	-----
  clusterroles						[]			[]		[get list]
  clusterroles.authorization.openshift.io		[]			[]		[get list]
  clusterroles.rbac.authorization.k8s.io		[]			[]		[get list watch]
  projectrequests					[]			[]		[list]
  projectrequests.project.openshift.io			[]			[]		[list]
  projects						[]			[]		[list watch]
  projects.project.openshift.io				[]			[]		[list watch]
  selfsubjectaccessreviews.authorization.k8s.io		[]			[]		[create]
  selfsubjectrulesreviews				[]			[]		[create]
  selfsubjectrulesreviews.authorization.openshift.io	[]			[]		[create]
  storageclasses.storage.k8s.io				[]			[]		[get list]
  users							[]			[~]		[get]
  users.user.openshift.io				[]			[~]		[get]


Name:		cluster-admin
Labels:		<none>
Annotations:	authorization.openshift.io/system-only=true
		openshift.io/description=A super-user that can perform any action in the cluster. When granted to a user within a project, they have full control over quota and membership and can perform every action...
		rbac.authorization.kubernetes.io/autoupdate=true
PolicyRule:
  Resources	Non-Resource URLs	Resource Names	Verbs
  ---------	-----------------	--------------	-----
  		[*]			[]		[*]
  *.*		[]			[]		[*]


Name:		cluster-debugger
Labels:		<none>
Annotations:	authorization.openshift.io/system-only=true
		rbac.authorization.kubernetes.io/autoupdate=true
PolicyRule:
  Resources	Non-Resource URLs	Resource Names	Verbs
  ---------	-----------------	--------------	-----
  		[/debug/pprof]		[]		[get]
  		[/debug/pprof/*]	[]		[get]
  		[/metrics]		[]		[get]


Name:		cluster-reader
Labels:		<none>
Annotations:	authorization.openshift.io/system-only=true
		rbac.authorization.kubernetes.io/autoupdate=true
PolicyRule:
  Resources							Non-Resource URLs	Resource Names	Verbs
  ---------							-----------------	--------------	-----
  								[*]			[]		[get]
  apiservices.apiregistration.k8s.io				[]			[]		[get list watch]
  apiservices.apiregistration.k8s.io/status			[]			[]		[get list watch]
  appliedclusterresourcequotas					[]			[]		[get list watch]

...

各種のロールにバインドされたユーザーおよびグループを示す、クラスターのロールバインディングの現在のセットを表示するには、以下を実行します。 

$ oc describe clusterrolebinding.rbac

Viewing Cluster Role Bindings

$ oc describe clusterrolebinding.rbac
Name:		admin
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	admin
Subjects:
  Kind			Name				Namespace
  ----			----				---------
  ServiceAccount	template-instance-controller	openshift-infra


Name:		basic-users
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	basic-user
Subjects:
  Kind	Name			Namespace
  ----	----			---------
  Group	system:authenticated


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
  ----			----		---------
  ServiceAccount	pvinstaller	default
  Group			system:masters


Name:		cluster-admins
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	cluster-admin
Subjects:
  Kind	Name			Namespace
  ----	----			---------
  Group	system:cluster-admins
  User	system:admin


Name:		cluster-readers
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	cluster-reader
Subjects:
  Kind	Name			Namespace
  ----	----			---------
  Group	system:cluster-readers


Name:		cluster-status-binding
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	cluster-status
Subjects:
  Kind	Name			Namespace
  ----	----			---------
  Group	system:authenticated
  Group	system:unauthenticated


Name:		registry-registry-role
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	system:registry
Subjects:
  Kind			Name		Namespace
  ----			----		---------
  ServiceAccount	registry	default


Name:		router-router-role
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	system:router
Subjects:
  Kind			Name	Namespace
  ----			----	---------
  ServiceAccount	router	default


Name:		self-access-reviewers
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	self-access-reviewer
Subjects:
  Kind	Name			Namespace
  ----	----			---------
  Group	system:authenticated
  Group	system:unauthenticated


Name:		self-provisioners
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	self-provisioner
Subjects:
  Kind	Name				Namespace
  ----	----				---------
  Group	system:authenticated:oauth


Name:		system:basic-user
Labels:		kubernetes.io/bootstrapping=rbac-defaults
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	system:basic-user
Subjects:
  Kind	Name			Namespace
  ----	----			---------
  Group	system:authenticated
  Group	system:unauthenticated


Name:		system:build-strategy-docker-binding
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	system:build-strategy-docker
Subjects:
  Kind	Name			Namespace
  ----	----			---------
  Group	system:authenticated


Name:		system:build-strategy-jenkinspipeline-binding
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	system:build-strategy-jenkinspipeline
Subjects:
  Kind	Name			Namespace
  ----	----			---------
  Group	system:authenticated


Name:		system:build-strategy-source-binding
Labels:		<none>
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	system:build-strategy-source
Subjects:
  Kind	Name			Namespace
  ----	----			---------
  Group	system:authenticated


Name:		system:controller:attachdetach-controller
Labels:		kubernetes.io/bootstrapping=rbac-defaults
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	system:controller:attachdetach-controller
Subjects:
  Kind			Name			Namespace
  ----			----			---------
  ServiceAccount	attachdetach-controller	kube-system


Name:		system:controller:certificate-controller
Labels:		kubernetes.io/bootstrapping=rbac-defaults
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true
Role:
  Kind:	ClusterRole
  Name:	system:controller:certificate-controller
Subjects:
  Kind			Name			Namespace
  ----			----			---------
  ServiceAccount	certificate-controller	kube-system


Name:		system:controller:cronjob-controller
Labels:		kubernetes.io/bootstrapping=rbac-defaults
Annotations:	rbac.authorization.kubernetes.io/autoupdate=true

...

8.2.2. Viewing Local Roles and Bindings

All of the default cluster roles can be bound locally to users or groups.

カスタムローカルロールを作成できます。

ローカルのロールバインディングも表示することができます。

各種のロールにバインドされたユーザーおよびグループを示す、ローカルのロールバインディングの現在のセットを表示するには、以下を実行します。 

$ oc describe rolebinding.rbac

By default, the current project is used when viewing local role bindings. Alternatively, a project can be specified with the -n flag. This is useful for viewing the local role bindings of another project, if the user already has the admindefault cluster role in it.

Viewing Local Role Bindings

$ oc describe rolebinding.rbac -n joe-project
Name:		admin
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	admin
Subjects:
  Kind	Name	Namespace
  ----	----	---------
  User	joe


Name:		system:deployers
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	system:deployer
Subjects:
  Kind			Name		Namespace
  ----			----		---------
  ServiceAccount	deployer	joe-project


Name:		system:image-builders
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	system:image-builder
Subjects:
  Kind			Name	Namespace
  ----			----	---------
  ServiceAccount	builder	joe-project


Name:		system:image-pullers
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	system:image-puller
Subjects:
  Kind	Name					Namespace
  ----	----					---------
  Group	system:serviceaccounts:joe-project

8.3. Managing Role Bindings

Adding, or binding, a role to users or groups gives the user or group the relevant access granted by the role. You can add and remove roles to and from users and groups using oc adm policy commands.

以下の操作を使用し、ローカルのロールバインディングでのユーザーまたはグループの関連付けられたロールを管理する際に、プロジェクトは -n フラグで指定できます。これが指定されていない場合には、現在のプロジェクトが使用されます。

表8.1 Local Role Binding Operations

コマンド説明

$ oc adm policy who-can <verb> <resource>

リソースに対してアクションを実行できるユーザーを示します。

$ oc adm policy add-role-to-user <role> <username>

指定されたロールを現在のプロジェクトの指定ユーザーにバインドします。

$ oc adm policy remove-role-from-user <role> <username>

現在のプロジェクトの指定ユーザーから指定されたロールを削除します。

$ oc adm policy remove-user <username>

現在のプロジェクトの指定ユーザーとそれらのロールのすべてを削除します。

$ oc adm policy add-role-to-group <role> <groupname>

指定されたロールを現在のプロジェクトの指定グループにバインドします。

$ oc adm policy remove-role-from-group <role> <groupname>

現在のプロジェクトの指定グループから指定されたロールを削除します。

$ oc adm policy remove-group <groupname>

現在のプロジェクトの指定グループとそれらのロールのすべてを削除します。

You can also manage cluster role bindings using the following operations. The -n flag is not used for these operations because cluster role bindings uses non-namespaced resources.

表8.2 Cluster Role Binding Operations

コマンド説明

$ oc adm policy add-cluster-role-to-user <role> <username>

指定されたロールをクラスターのすべてのプロジェクトの指定ユーザーにバインドします。

$ oc adm policy remove-cluster-role-from-user <role> <username>

指定されたロールをクラスターのすべてのプロジェクトの指定ユーザーから削除します。

$ oc adm policy add-cluster-role-to-group <role> <groupname>

指定されたロールをクラスターのすべてのプロジェクトの指定グループにバインドします。

$ oc adm policy remove-cluster-role-from-group <role> <groupname>

指定されたロールをクラスターのすべてのプロジェクトの指定グループから削除します。

たとえば、以下を実行して admin ロールを joe-project の alice ユーザーに追加できます。 

$ oc adm policy add-role-to-user admin alice -n joe-project

次に、ローカルのロールバインディングを表示し、出力に追加されていることを確認します。 

$ oc describe rolebinding.rbac -n joe-project
Name:		admin
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	admin
Subjects:
  Kind	Name	Namespace
  ----	----	---------
  User	joe
  User	alice 1


Name:		system:deployers
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	system:deployer
Subjects:
  Kind			Name		Namespace
  ----			----		---------
  ServiceAccount	deployer	joe-project


Name:		system:image-builders
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	system:image-builder
Subjects:
  Kind			Name	Namespace
  ----			----	---------
  ServiceAccount	builder	joe-project


Name:		system:image-pullers
Labels:		<none>
Annotations:	<none>
Role:
  Kind:	ClusterRole
  Name:	system:image-puller
Subjects:
  Kind	Name					Namespace
  ----	----					---------
  Group	system:serviceaccounts:joe-project
1
The alice user has been added to the admins RoleBinding.

8.4. Creating a Local Role

プロジェクトのローカルロールを作成するには、以下のコマンドを実行します。 

$ oc create role ...

The following excerpt from the help of this command describes its usage: 

Create a role with single rule.

Usage:
  oc create role NAME --verb=verb --resource=resource.group/subresource [--resource-name=resourcename] [--dry-run] [options]

Examples:
  # Create a Role named "pod-reader" that allows user to perform "get", "watch" and "list" on pods
  oc create role pod-reader --verb=get --verb=list --verb=watch --resource=pods

  # Create a Role named "pod-reader" with ResourceName specified
  oc create role pod-reader --verb=get,list,watch --resource=pods --resource-name=readablepod --resource-name=anotherpod

  # Create a Role named "foo" with API Group specified
  oc create role foo --verb=get,list,watch --resource=rs.extensions

  # Create a Role named "foo" with SubResource specified
  oc create role foo --verb=get,list,watch --resource=pods,pods/status

Options:
      --dry-run=false: If true, only print the object that would be sent, without sending it.
      --resource=[]: resource that the rule applies to
      --resource-name=[]: resource in the white list that the rule applies to, repeat this flag for multiple items
      --verb=[]: verb that applies to the resources contained in the rule

...

For example, to create a role that allows a user to view pods, run: 

$ oc create role podview --verb=get --resource=pod -n bob-project

Optionally, annotate it with a description.

To bind the new role to a user, run: 

$ oc adm policy add-role-to-user podview user2 --role-namespace=bob-project -n bob-project

8.5. Cluster and Local Role Bindings

A cluster role binding is a binding that exists at the cluster level. A role binding exists at the project level. The cluster role view must be bound to a user using a local role binding for that user to view the project. Local roles should only created if a cluster role does not provide the set of permissions needed for a particular situation.

Some cluster role names are initially confusing. The cluster role clusteradmin can be bound to a user using a local role binding, making it appear that this user has the privileges of a cluster administrator. This is not the case. The clusteradmin cluster role bound to a certain project is more like a super administrator for that project, granting the permissions of the cluster role admin, plus a few additional permissions like the ability to edit rate limits. This can appear especially confusing via the web console UI, which does not list cluster role bindings (which are bound to true cluster administrators). However, it does list local role bindings (which could be used to locally bind clusteradmin).