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Creating Namespaces#

Creating Namespaces via Tenant Custom Resource#

Bill now wants to create namespaces for dev, build and production environments for the tenant members. To create those namespaces Bill will just add those names within the namespaces field in the tenant CR. If Bill wants to append the tenant name as a prefix in namespace name, then he can use namespaces.withTenantPrefix field. Else he can use namespaces.withoutTenantPrefix for namespaces for which he does not need tenant name as a prefix.

kubectl apply -f - << EOF
kind: Tenant
  name: bluesky
    - alpha
  quota: small
      - dev
      - build
      - prod

With the above configuration tenant members will now see new namespaces have been created.

kubectl get namespaces
NAME             STATUS   AGE
bluesky-dev      Active   5d5h
bluesky-build    Active   5d5h
prod             Active   5d5h

Anna as the tenant owner can create new namespaces for her tenant.

apiVersion: v1
kind: Namespace
  name: bluesky-production
  labels: bluesky

⚠️ Anna is required to add the tenant label bluesky which contains the name of her tenant bluesky, while creating the namespace. If this label is not added or if Anna does not belong to the bluesky tenant, then Multi Tenant Operator will not allow the creation of that namespace.

When Anna creates the namespace, MTO assigns Anna and other tenant members the roles based on their user types, such as a tenant owner getting the OpenShift admin role for that namespace.

As a tenant owner, Anna is able to create namespaces.

If you have enabled ArgoCD Multitenancy, our preferred solution is to create tenant namespaces by using Tenant spec to avoid syncing issues in ArgoCD console during namespace creation.

Add Existing Namespaces to Tenant via GitOps#

Using GitOps as your preferred development workflow, you can add existing namespaces for your tenants by including the tenant label.

To add an existing namespace to your tenant via GitOps:

  1. First, migrate your namespace resource to your “watched” git repository
  2. Edit your namespace yaml to include the tenant label
  3. Tenant label follows the naming convention <TENANT_NAME>
  4. Sync your GitOps repository with your cluster and allow changes to be propagated
  5. Verify that your Tenant users now have access to the namespace

For example, If Anna, a tenant owner, wants to add the namespace bluesky-dev to her tenant via GitOps, after migrating her namespace manifest to a “watched repository”

apiVersion: v1
kind: Namespace
  name: bluesky-dev

She can then add the tenant label

  labels: bluesky

Now all the users of the Bluesky tenant now have access to the existing namespace.

Additionally, to remove namespaces from a tenant, simply remove the tenant label from the namespace resource and sync your changes to your cluster.

Remove Namespaces from your Cluster via GitOps#

GitOps is a quick and efficient way to automate the management of your K8s resources.

To remove namespaces from your cluster via GitOps;

  • Remove the yaml file containing your namespace configurations from your “watched” git repository.
  • ArgoCD automatically sets the []( label on resources it manages. It uses this label it to select resources which inform the basis of an app. To remove a namespace from a managed ArgoCD app, remove the ArgoCD label from the namespace manifest.
  • You can edit your namespace manifest through the OpenShift Web Console or with the OpenShift command line tool.
  • Now that you have removed your namespace manifest from your watched git repository, and from your managed ArgoCD apps, sync your git repository and allow your changes be propagated.
  • Verify that your namespace has been deleted.

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