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javaspring-bootmavenkubernetesconfigmap

How do I build my spring boot project that's trying to reference an external properties file created after deployment to a Kubernetes cluster?

I'm trying to reference an external properties file to override the default spring properties file.

Dockerfile

FROM eclipse-temurin:latest
VOLUME /tmp
COPY ./target/basicRestApp-0.0.1-SNAPSHOT.jar app/app.jar
ENTRYPOINT ["java","-jar","app/app.jar"]

Deployment

volumeMounts:
 - name: config-volume
   mountPath: /app/config

volumes:
  - name: config-volume
    configMap:
     name: test-config-map

Configmap

apiVersion: v1
kind: ConfigMap
metadata:
  name: test-config-map
  namespace: default
data:
  application.yaml: |-
 key: value .....

I've tried to reference the external properties file with a @Configuration class with @PropertySource("file:$/config/application.yaml")and attempt to build the program (maven) I get the error "$/config/application.yaml (No such file or directory)" and I'm unable to build.

I've also tried adding the command line argument --spring.config.location=file:/app/config/application.yaml in my docker file. This results in another error java.lang.IllegalStateException: Could not load store from '/root/rins_common/rins_service_config/rins-keystore'

I was expecting to be able to build the application and have the application reference the later-created properties file. But this makes sense because that file path does not exist till the manifests are applied to the cluster.

Solution

  • instead of using @PropertySource you could try to add the command line argument --spring.config.location=file:/app/config/application.yaml to the entrypoint, if you want override the default spring properties file. you can also add this to your K8 Deployment YAML instead of the Dockerfile.