Using ConfigMap to Define MapR Data Science Refinery Variables in Kubernetes

You can use a ConfigMap to define your MapR Data Science Refinery environment variables. ConfigMaps enable you to decouple configuration artifacts from image content, providing more portable containerized applications. This topic describes the steps to define and deploy a ConfigMap.

Procedure

  1. Define your environment variables in a ConfigMap (dsrconfigmap.yaml): 
    apiVersion: v1
kind: ConfigMap
metadata:
  name: dsr-configmap
data:
  MAPR_CLUSTER: "my.cluster.com"
  MAPR_CLDB_HOSTS: "1.1.1.1"
  MAPR_HS_HOST: "2.2.2.2"
  MAPR_CONTAINER_USER: "mapr"
  MAPR_CONTAINER_UID: "5000"
  MAPR_CONTAINER_GROUP: "mapr"
  MAPR_CONTAINER_GID: "5000"
  MAPR_MOUNT_PATH: /mapr
  2. Create the configMap before deploying your MapR Data Science Refinery container by running the following command: 
    kubectl create -f dsrconfigmap.yaml
  3. Modify your deployment YAML file and use configMapKeyRef to reference variables from the ConfigMap defined in the first step above, as shown in the following sample: 
    env:
    - name: MAPR_MOUNT_PATH
      valueFrom:
        configMapKeyRef:
          name: dsr-configmap
          key: MAPR_MOUNT_PATH
    - name: MAPR_CLUSTER
      valueFrom:
        configMapKeyRef:
          name: dsr-configmap
          key: MAPR_CLUSTER
    - name: MAPR_CLDB_HOSTS
      valueFrom:
        configMapKeyRef:
          name: dsr-configmap
          key: MAPR_CLDB_HOSTS
    - name: MAPR_CONTAINER_USER
      valueFrom:
        configMapKeyRef:
          name: dsr-configmap
          key: MAPR_CONTAINER_USER
    - name: MAPR_CONTAINER_UID
      valueFrom:
        configMapKeyRef:
          name: dsr-configmap
          key: MAPR_CONTAINER_UID
    - name: MAPR_CONTAINER_GID
      valueFrom:
        configMapKeyRef:
          name: dsr-configmap
          key: MAPR_CONTAINER_GID
    - name: MAPR_CONTAINER_GROUP
      valueFrom:
        configMapKeyRef:
          name: dsr-configmap
          key: MAPR_CONTAINER_GROUP
    - name: MAPR_CONTAINER_PASSWORD
      valueFrom:
        secretKeyRef:
          name: dsr-container-secret
          key: password
    - name: HOST_IP
      valueFrom:
        fieldRef:
          fieldPath: status.hostIP
    - name: MAPR_HS_HOST
      valueFrom:
        configMapKeyRef:
          name: dsr-configmap
          key: MAPR_HS_HOST