Customizing resource on DG Operator pod itself in OCP 4

Environment

• Red hat OpenShift Container Platform (OCP)
  • 4.x
• Red Hat Data Grid (RHDG)
  • 8.x

Issue

• How to customize resource on Operator pod itself?
• How to increase DataGrid pod resources?
• Increasing DG pod resources

Resolution

For customizing the Operator itself (the pod operator) the values must be set on the respective Data Grid's Subscription, which is listened to by the OLM - in case of issues, like prevention of leader election timing out:

apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata: 
  name: datagrid
spec: 
  channel: 8.3.x
  installPlanApproval: Manual
  name: datagrid
  source: redhat-operators
  sourceNamespace: openshift-marketplace
  startingCSV: datagrid-operator.v8.3.6
  config: 
    resources: 
      requests: 
        memory: "64Mi"
        cpu: "250m"
      limits: 
        memory: "128Mi"
        cpu: "500m"

Changing Java max ratio percentage

Currently the user can only use Xmx or set JAVA_MAX_MEM_RATIO env on the Subscription:

kind: Subscription
spec:
  ...
  config:
    env:
    - name: ADDITIONAL_VARS
      value: "[\"JAVA_MAX_MEM_RATIO\"]"
    - name: JAVA_MAX_MEM_RATIO
      value: "25"

Root Cause

Increasing the DG Operator resources can be useful when many Infinispan Custom Resources are being handled by the Operator, e.g. 100/200+ Caches/Infinispan CRs. So then the leader might timeout as above, and editing the Subscription can be used to increase its resources directly without editing/changing the deployment, which will be overwritten by the OLM.
Although DG doesn't allow (and doesn't support), a few operators allow direct deployment, meaning creating directly the operator pods (deployment+csv+crds) and not via subscription YAML.

For customizations on the Infinispan Custom resource, see the solution Using custom configuration in DG 8 via Operator.

Diagnostic Steps

1. See the subscription via: $ oc get sub. And CSV via $ oc get csv.
2. See the deployment via: $ oc get deployment.

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