How to link SpringBoot application.properties file to Kubernetes ConfigMaps and Secrets

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 To link your Spring Boot application to Kubernetes ConfigMaps and Secrets, you can follow these steps:

  1. Create ConfigMaps and Secrets in Kubernetes: First, create ConfigMaps and Secrets in Kubernetes that will store your database URL, username, and password. You can use the kubectl create configmap and kubectl create secret commands to create these resources.

  2. Define placeholders in application.properties: In your application.properties file, you can define placeholders for the database URL, username, and password using the syntax ${PLACEHOLDER_NAME}. For example:

bash
spring.datasource.url=${DB_URL}
spring.datasource.username=${DB_USERNAME}
spring.datasource.password=${DB_PASSWORD}
  1. Inject values from ConfigMaps and Secrets into placeholders: Next, you can inject the values from your ConfigMaps and Secrets into these placeholders. You can do this by setting the values of the placeholders to the name of the ConfigMap or Secret followed by the key that contains the value you want to inject. For example:
bash
spring.datasource.url=${MY_APP_DB_URL}
spring.datasource.username=${MY_APP_DB_USERNAME}
spring.datasource.password=${MY_APP_DB_PASSWORD}

Here, MY_APP_DB_URL, MY_APP_DB_USERNAME, and MY_APP_DB_PASSWORD are the names of the ConfigMap or Secret followed by the key that contains the value you want to inject.

  1. Define ConfigMap and Secret dependencies in deployment.yaml: Finally, you need to define the ConfigMap and Secret dependencies in your deployment.yaml file. You can use the envFrom field to inject values from ConfigMaps and Secrets into environment variables in your container. For example:
yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 1
  template:
    spec:
      containers:
        - name: my-app-container
          image: my-app-image
          envFrom:
            - configMapRef:
                name: my-app-configmap
            - secretRef:
                name: my-app-secret

Here, my-app-configmap and my-app-secret are the names of your ConfigMap and Secret resources.

By defining the ConfigMap and Secret dependencies in your deployment.yaml file, Kubernetes will automatically inject the values from these resources into the placeholders defined in your application.properties file at runtime.

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