docker-mx-server/docker-compose.yml

version: '2'

services:
    database:
        build: ./postgresql
        container_name: mx-postgresql
        networks:
            internal.docker:
                aliases:
                    - postgresql.internal.docker
        volumes:
            - ./data/postgresql/data:/var/lib/postgresql/data
        ports:
            - "34000:5432"
        environment:
            - POSTGRES_USER=postfixadmin
            - POSTGRES_PASSWORD=pg_password

    postfixadmin:
        build: ./postfixadmin
        container_name: mx-postfixadmin
        networks:
            internal.docker:
                aliases:
                    - postfixadmin.internal.docker
        ports:
            - "34001:80"
        environment:
            - DB_HOST=postgresql.internal.docker
            - DB_USER=postfixadmin
            - DB_PASSWORD=pg_password
            - DB_DB=postfixadmin

networks:
    internal.docker: