Docker Compose + Spring Boot + Postgres connection

Question

I have a Java Spring Boot app which works with a Postgres database. I want to use Docker for both of them. I initially put just the Postgres in Docker, and I had a docker-

Answer 1

You can use this.

version: "2"
services:
    sample_db-postgresql:
        image: postgres:9.5
        ports:
            - 5432:5432
        environment:
            - POSTGRES_PASSWORD=sample
            - POSTGRES_USER=sample
            - POSTGRES_DB=sample
         volumes:
            - sample_db:/var/lib/postgresql/data

volumes:
    sample_db: