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Kubernetes: Storage - Use ConfigMap as Environment Variable

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• Kubernetes: Storage - Use ConfigMap as Environment Variable
  • Using Configmaps as environment variables
  • Lab: Use ConfigMap as Environment variables
    • Create ConfigMap
    • Bulk Import
    • Import a Key

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Using Configmaps as environment variables

• Import value

kind: Pod
spec:
  containers:
    - name: app
      env:
        - name: APP_MODE
          valueFrom:
            configMapKeyRef:
              name: app-config
              key: APP_MODE

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• bulk import:

kind: Pod
spec:
  containers:
    - name: app
      envFrom:
        - configMapRef:
            name: mapp-config

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Lab: Use ConfigMap as Environment variables

Create ConfigMap

kubectl create cm app-config --from-literal=APP_MODE=prod --from-literal=LOG_LEVEL=info
# configmap/app-config created

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Bulk Import

• pod-conf-bulk.yaml

apiVersion: v1
kind: Pod
metadata:
  name: pod-conf-bulk
spec:
  containers:
    - name: myapp
      command: ["sh", "-c", "env | grep -E 'APP_MODE|LOG_LEVEL' && sleep 2000"]
      image: busybox:latest
      envFrom:
        - configMapRef:
            name: app-config

kubectl create -f pod-conf-bulk.yaml
# pod/pod-conf-bulk created

kubectl get pod
# NAME            READY   STATUS    RESTARTS   AGE
# pod-conf-bulk   1/1     Running   0          13s

kubectl logs pod/pod-conf-bulk
# APP_MODE=prod
# LOG_LEVEL=info

kubectl delete pod/pod-conf-bulk
# pod "pod-conf-bulk" deleted from default namespace

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Import a Key

• pod-conf-key.yaml

apiVersion: v1
kind: Pod
metadata:
  name: pod-conf-key
spec:
  containers:
    - name: myapp
      image: busybox
      command: ["sh", "-c", "env | grep -E 'APP_MODE|LOG_LEVEL' && sleep 2000"]
      env:
        - name: APP_MODE
          valueFrom:
            configMapKeyRef:
              name: app-config
              key: APP_MODE

kubectl create -f pod-conf-key.yaml
# pod/pod-conf-key created

kubectl get pod
# NAME            READY   STATUS    RESTARTS   AGE
# pod-conf-bulk   1/1     Running   0          13s

kubectl logs pod/pod-conf-key
# APP_MODE=prod

kubectl delete pod/pod-conf-key
# pod "pod-conf-key" deleted from default namespace

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