Configuring a Deployment to Use a ConfigMap

Create a ConfigMap.

1. Create a new file called config-map.yaml to specify your first name and a greeting message:

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   apiVersion: v1
   kind: ConfigMap
   metadata:
     name: name-greeting
   data:
       GREETING: "Hello"
       FIRSTNAME: "Kyma"

2. Apply the ConfigMap via kubectl.

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   kubectl apply -f config-map.yaml

3. Check if the ConfigMap has been created:

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   kubectl get configmaps

Deploy an application with the ConfigMap.

1. Create a new file called deployment.yaml to specify your deployment:

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   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: test-configmap
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: test-configmap
     template:
       metadata:
         labels:
           app: test-configmap
       spec:
         containers:
         - name: test-configmap
           image: bash
           envFrom:
           - configMapRef:
               name: name-greeting
           command: ["echo"]
           args: ["$(GREETING) $(FIRSTNAME)!"]

2. Apply the deployment via kubectl.

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   kubectl apply -f deployment.yaml

3. Get the Pod name.

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   kubectl get pods -l app=test-configmap

4. Get the output of the Pod.

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   kubectl logs <pod-name>

   Alternatively, you could also retrieve the logs via the label selector:

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   kubectl logs -l app=test-configmap

5. Delete the deployment

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   kubectl delete deployment test-configmap