# 服务配置参考

Compose文件是一个yaml文件，可以以.yaml或yml文件扩展名结尾。Compose文件定义了服务(services)，网络（network）和卷（volume）。Compose文件的默认路径是./docker-compose.yml。

在一个服务的定义中包含的一些配置信息会被用于每一个容器的启动。特别像传递命令行参数给docker run命令。网络和卷的定义类似于docker volume create和docker network create。

与docker run一样，Dockerfile中指定的选项（如 CMD、EXPOSE、VOLUME、ENV）默认受到关注。 我们不需要在docker-compose.yml中再次指定它们。

在配置Compose文件时，可以使用变量替换来引用变量中的值。使用像bash那样的语法：${VARIABLE}。


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