Creating ResourceQuotas to limit resource usages of modules

ResourceQuotas are Kubernetes resources that can be used to limit the number of infrastructure resources (such as CPU cores or memory) or Kubernetes resources (such as pods or deployments) that are available on a namespace basis.

From IBM Cloud Pak® for Multicloud Management Fix Pack 5, a set of ResourceQuotas can be used in IBM Cloud Pak® for Multicloud Management to limit the resource usages of IBM Cloud Pak® for Multicloud Management modules. The ResourceQuotas settings are optional, which means that it depends on you whether to use them or not.

As other namespace-scoped Kubernetes resources, ResourceQuotas can be created only in namespaces that already exist. The ibm-management-orchestrator pod in the openshift-operators namespace can create the namespaces that are required for IBM Cloud Pak® for Multicloud Management modules that are enabled in the installation CR. However, you can create the relevant namespaces for IBM Cloud Pak® for Multicloud Management modules beforehand so that the ResourceQuota can be created before resources are provisioned in the related namespaces.

To limit the resource usages of IBM Cloud Pak® for Multicloud Management modules, follow either of the steps:

• Create the namespaces for the modules that you need first, and then create the ResourceQuotas for the namespaces before you install the IBM Cloud Pak® for Multicloud Management. For how to create a ResourceQuota, see the creating a ResourceQuota section.

  Here are the mappings of IBM Cloud Pak® for Multicloud Management modules to the namespaces where they are installed:

  • Infrastructure management: management-infrastructure-management.
  • Monitoring: management-monitoring.
  • Security services: management-security-services.
  • operations: management-operations.
  • Technology preview: kube-system. The kube-system namespace is always created with every installation of IBM Cloud Pak® for Multicloud Management.

• Install the IBM Cloud Pak® for Multicloud Management first, and enable IBM Cloud Pak® for Multicloud Management modules that you need. Then, create the ResourceQuota for the namespaces of the modules. For how to create a ResourceQuota, see the creating a ResourceQuota section.

  For example, after you install IBM Cloud Pak® for Multicloud Management, and enable the Infrastructure Management module, the management-infrastructure-management namespace is created automatically. Then, you can create the ResourceQuota for the management-infrastructure-management namespace.

Creating a ResourceQuota

To create a ResourceQuota, follow the steps:

1. Copy and paste the following code blocks into a file, and save it.

   • management-operations

     apiVersion: v1
     kind: ResourceQuota
     metadata:
     name: compute-resources
     namespace: management-operations
     spec:
     hard:
         limits.cpu: "50"
         limits.memory: 128Gi
         requests.cpu: "50"
         requests.memory: 128Gi
     

   • management-monitoring

     apiVersion: v1
     kind: ResourceQuota
     metadata:
     name: compute-resources
     namespace: management-monitoring
     spec:
     hard:
         limits.cpu: "50"
         limits.memory: 128Gi
         requests.cpu: "50"
         requests.memory: 128Gi
     

   • management-infrastructure-management

     apiVersion: v1
     kind: ResourceQuota
     metadata:
     name: compute-resources
     namespace: management-infrastructure-management
     spec:
     hard:
         limits.cpu: "50"
         limits.memory: 128Gi
         requests.cpu: "50"
         requests.memory: 128Gi
     

   • management-security-services

     apiVersion: v1
     kind: ResourceQuota
     metadata:
     name: compute-resources
     namespace: management-security-services
     spec:
     hard:
         limits.cpu: "50"
         limits.memory: 128Gi
         requests.cpu: "50"
         requests.memory: 128Gi
     

   • kube-system

     apiVersion: v1
     kind: ResourceQuota
     metadata:
     name: compute-resources
     namespace: kube-system
     spec:
     hard:
         limits.cpu: "50"
         limits.memory: 128Gi
         requests.cpu: "50"
         requests.memory: 128Gi
     

2. Complete the creation of the ResourceQuota by running the following command:

   oc apply -f file-name-resourcequota-here.yaml