Spring on docker, environment variables not evaluated with configuration placeholders - spring

Question

I have a Spring project and use an application.yml file to run configure it. When using placeholders in the configuration file and run it as a built docker image it will not evaluate the placeholder, whereas this works fine when running the jar without docker. What could be wrong here?
org.postgresql.util.PSQLException: FATAL: password authentication failed for user "${POSTGRES_DB_USER}"
application.yml
server:
compression:
enabled: true
mime-types: application/json,application/xml,text/html,text/xml,text/plain
context-path: /
port: 8085
logging:
config: config/log4j2-spring.xml
spring:
datasource:
url: jdbc:h2:./data/cdr
username: sa
password:
jpa:
hibernate:
ddl-auto: create-drop
security:
user:
password: secretpassword
---
spring:
profiles: docker
datasource:
url: jdbc:postgresql://postgres/databasename
username: ${POSTGRES_DB_USER}
password: ${POSTGRES_DB_PASS}
docker-compose.yml
version: '2'
services:
application:
image: domain.com:3000/application:0-SNAPSHOT
volumes:
- application:/application/logs
ports:
- 8085:8085
links:
- postgres
environment:
PASSWORD: secretpassword
postgres:
image: sameersbn/postgresql:9.5-2
volumes:
- postgres-data:/var/lib/postgresql
environment:
DB_NAME: databasename
DB_USER: user
DB_PASS: secretpassword
volumes:
postgres-data:
driver: local
application-logs:
driver: local

Answer 1

I think you want this:
version: '2'
services:
application:
image: domain.com:3000/application:0-SNAPSHOT
volumes:
- application-logs:/application/logs
ports:
- 8085:8085
environment:
POSTGRES_DB_USER: user
POSTGRES_DB_PASS: secretpassword
postgres:
image: sameersbn/postgresql:9.5-2
volumes:
- postgres-data:/var/lib/postgresql
environment:
DB_NAME: databasename
DB_USER: user
DB_PASS: secretpassword
volumes:
postgres-data: {}
application-logs: {}