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.

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 step 1, 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