容器如何在docker compose中相互链接。yml公司

为了构建web服务器,我试图了解容器是如何 附件 我真的需要一些快速的答案。
如果我们拿这个 docker-compose.yml 以文件为例:

version: '2'

services:

    # APP
    nginx:
        build: docker/nginx
        volumes_from:
            - php
        links:
            - php
        depends_on:
            - php

    php:
        build: docker/php
        volumes:
            - ${SYMFONY_APP_PATH}:/symfony
        links:
            - mysql
            - faye
            - rabbitmq
            - elasticsearch

    client:
        image: node:8.9.4
        volumes_from:
            - php
        working_dir: /symfony
        user: 1000:1000
        command: "npm run dev"
        ports:
          - "${LIVERELOAD_PORT}:35729"
        environment:
          LIVERELOAD_PORT: ${LIVERELOAD_PORT}

    mysql:
        build: docker/mysql
        environment:
            MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
            MYSQL_DATABASE: ${MYSQL_DATABASE}
            MYSQL_USER: ${MYSQL_USER}
            MYSQL_PASSWORD: ${MYSQL_PASSWORD}
        volumes:
            - ${SYMFONY_APP_PATH}:/symfony
            - "mysql:/var/lib/mysql"
    rabbitmq:
        image: rabbitmq:3.4-management
        volumes:
          - "rabbitmq:/var/lib/rabbitmq"

        volumes:
          - "elasticsearch5:/usr/share/elasticsearch/data"
          - ${SYMFONY_APP_PATH}:/symfony
volumes:
    mysql: ~
    elasticsearch5: ~
    rabbitmq: ~

有什么区别 between volumes_from ,则, links 和 depends_on ?
如果我们的想法是将每个容器与另一个容器连接在一起,那么我们为什么不只使用 链接 。两者的区别是什么 卷\u自 ,则, 链接 和 取决于 。