spring.config.additional-location as environmental variable
Value for spring.config.additional-location must be a directory path and not a file path. I'm not sure if this is a bug or a feature, since spring.config.location allows both.
For example inside docker-compose.yml you can set spring.config.additional-location as:
version: '3' services: myapp: build: . environment: - "SPRING_CONFIG_ADDITIONAL-LOCATION=file:/opt/myapp/config/" - "SPRING_PROFILES_ACTIVE=production"...Then Spring Boot will look up for /opt/myapp/config/application-production.properties file to load properties from.
More about this in Spring Boot Externalized Configuration