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About Operator groups

An Operator group, defined by the OperatorGroup resource, provides multitenant configuration to OLM-installed Operators. An Operator group selects target namespaces in which to generate required RBAC access for its member Operators.

The set of target namespaces is provided by a comma-delimited string stored in the olm.targetNamespaces annotation of a cluster service version (CSV). This annotation is applied to the CSV instances of member Operators and is projected into their deployments.

Operator group membership

An Operator is considered a member of an Operator group if the following conditions are true:

  • The CSV of the Operator exists in the same namespace as the Operator group.

  • The install modes in the CSV of the Operator support the set of namespaces targeted by the Operator group.

An install mode in a CSV consists of an InstallModeType field and a boolean Supported field. The spec of a CSV can contain a set of install modes of four distinct InstallModeTypes:

Table 1. Install modes and supported Operator groups
InstallModeType Description

OwnNamespace

The Operator can be a member of an Operator group that selects its own namespace.

SingleNamespace

The Operator can be a member of an Operator group that selects one namespace.

MultiNamespace

The Operator can be a member of an Operator group that selects more than one namespace.

AllNamespaces

The Operator can be a member of an Operator group that selects all namespaces (target namespace set is the empty string "").

If the spec of a CSV omits an entry of InstallModeType, then that type is considered unsupported unless support can be inferred by an existing entry that implicitly supports it.

Target namespace selection

You can explicitly name the target namespace for an Operator group using the spec.targetNamespaces parameter:

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: my-group
  namespace: my-namespace
spec:
  targetNamespaces:
  - my-namespace

You can alternatively specify a namespace using a label selector with the spec.selector parameter:

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: my-group
  namespace: my-namespace
spec:
  selector:
    cool.io/prod: "true"

Listing multiple namespaces via spec.targetNamespaces or use of a label selector via spec.selector is not recommended, as the support for more than one target namespace in an Operator group will likely be removed in a future release.

If both spec.targetNamespaces and spec.selector are defined, spec.selector is ignored. Alternatively, you can omit both spec.selector and spec.targetNamespaces to specify a global Operator group, which selects all namespaces:

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  name: my-group
  namespace: my-namespace

The resolved set of selected namespaces is shown in the status.namespaces parameter of an Opeator group. The status.namespace of a global Operator group contains the empty string (""), which signals to a consuming Operator that it should watch all namespaces.

Operator group CSV annotations

Member CSVs of an Operator group have the following annotations:

Annotation Description

olm.operatorGroup=<group_name>

Contains the name of the Operator group.

olm.operatorNamespace=<group_namespace>

Contains the namespace of the Operator group.

olm.targetNamespaces=<target_namespaces>

Contains a comma-delimited string that lists the target namespace selection of the Operator group.

All annotations except olm.targetNamespaces are included with copied CSVs. Omitting the olm.targetNamespaces annotation on copied CSVs prevents the duplication of target namespaces between tenants.

Provided APIs annotation

A group/version/kind (GVK) is a unique identifier for a Kubernetes API. Information about what GVKs are provided by an Operator group are shown in an olm.providedAPIs annotation. The value of the annotation is a string consisting of <kind>.<version>.<group> delimited with commas. The GVKs of CRDs and API services provided by all active member CSVs of an Operator group are included.

Review the following example of an OperatorGroup object with a single active member CSV that provides the PackageManifest resource:

apiVersion: operators.coreos.com/v1
kind: OperatorGroup
metadata:
  annotations:
    olm.providedAPIs: PackageManifest.v1alpha1.packages.apps.redhat.com
  name: olm-operators
  namespace: local
  ...
spec:
  selector: {}
  serviceAccount:
    metadata:
      creationTimestamp: null
  targetNamespaces:
  - local
status:
  lastUpdated: 2019-02-19T16:18:28Z
  namespaces:
  - local

Role-based access control

When an Operator group is created, three cluster roles are generated. Each contains a single aggregation rule with a cluster role selector set to match a label, as shown below:

Cluster role Label to match

<operatorgroup_name>-admin

olm.opgroup.permissions/aggregate-to-admin: <operatorgroup_name>

<operatorgroup_name>-edit

olm.opgroup.permissions/aggregate-to-edit: <operatorgroup_name>

<operatorgroup_name>-view

olm.opgroup.permissions/aggregate-to-view: <operatorgroup_name>

The following RBAC resources are generated when a CSV becomes an active member of an Operator group, as long as the CSV is watching all namespaces with the AllNamespaces install mode and is not in a failed state with reason InterOperatorGroupOwnerConflict:

  • Cluster roles for each API resource from a CRD

  • Cluster roles for each API resource from an API service

  • Additional roles and role bindings

Table 2. Cluster roles generated for each API resource from a CRD
Cluster role Settings

<kind>.<group>-<version>-admin

Verbs on <kind>:

  • *

Aggregation labels:

  • rbac.authorization.k8s.io/aggregate-to-admin: true

  • olm.opgroup.permissions/aggregate-to-admin: <operatorgroup_name>

<kind>.<group>-<version>-edit

Verbs on <kind>:

  • create

  • update

  • patch

  • delete

Aggregation labels:

  • rbac.authorization.k8s.io/aggregate-to-edit: true

  • olm.opgroup.permissions/aggregate-to-edit: <operatorgroup_name>

<kind>.<group>-<version>-view

Verbs on <kind>:

  • get

  • list

  • watch

Aggregation labels:

  • rbac.authorization.k8s.io/aggregate-to-view: true

  • olm.opgroup.permissions/aggregate-to-view: <operatorgroup_name>

<kind>.<group>-<version>-view-crdview

Verbs on apiextensions.k8s.io customresourcedefinitions <crd-name>:

  • get

Aggregation labels:

  • rbac.authorization.k8s.io/aggregate-to-view: true

  • olm.opgroup.permissions/aggregate-to-view: <operatorgroup_name>

Table 3. Cluster roles generated for each API resource from an API service
Cluster role Settings

<kind>.<group>-<version>-admin

Verbs on <kind>:

  • *

Aggregation labels:

  • rbac.authorization.k8s.io/aggregate-to-admin: true

  • olm.opgroup.permissions/aggregate-to-admin: <operatorgroup_name>

<kind>.<group>-<version>-edit

Verbs on <kind>:

  • create

  • update

  • patch

  • delete

Aggregation labels:

  • rbac.authorization.k8s.io/aggregate-to-edit: true

  • olm.opgroup.permissions/aggregate-to-edit: <operatorgroup_name>

<kind>.<group>-<version>-view

Verbs on <kind>:

  • get

  • list

  • watch

Aggregation labels:

  • rbac.authorization.k8s.io/aggregate-to-view: true

  • olm.opgroup.permissions/aggregate-to-view: <operatorgroup_name>

Additional roles and role bindings
  • If the CSV defines exactly one target namespace that contains *, then a cluster role and corresponding cluster role binding are generated for each permission defined in the permissions field of the CSV. All resources generated are given the olm.owner: <csv_name> and olm.owner.namespace: <csv_namespace> labels.

  • If the CSV does not define exactly one target namespace that contains *, then all roles and role bindings in the Operator namespace with the olm.owner: <csv_name> and olm.owner.namespace: <csv_namespace> labels are copied into the target namespace.

Copied CSVs

OLM creates copies of all active member CSVs of an Operator group in each of the target namespaces of that Operator group. The purpose of a copied CSV is to tell users of a target name