How to append the already existing environment variable instead of overriding them

[tejajagadeep]

Description

I can rewriting my application properties for my spring boot project in my docker compose I want to know how I can append to already existing file instead of overriding the properties.

wishlist-service:
    image: tejajagadeep/movie-app-wishlist-service:latest
    container_name: wishlist-container
    environment:
      - eureka.client.service-url.defaultZone=http://eureka-server:8761/eureka
      - spring.config.import=optional:configserver:http://config-server:8888/
      - management.zipkin.tracing.endpoint=http://zipkin-server:9411/api/v2/spans
      - swagger.server.url=http://localhost:8769/,http://localhost:4200/
      - spring.data.mongodb.uri=mongodb://root:root1234@mongodb:27017/wishlistdb?authSource=admin
    ports:
      - "8082:8082"
    networks:
      - my-network

I want to append this property instead of overwriting it.

- swagger.server.url=http://localhost:8769/,http://localhost:4200/, + values

[ndeloof]

I hardly can imagine a simple way to address this. Any suggestion ?

[neelp03]

Have you tried entrypoint script? It can modify the server url just before the application starts, adding the extra values you need.
You can also try expanding env variables, but it might not be possible since it requires the env variable to be predefined in the shell. Also what about making an environment file where you specify all your environment variables?