linux - docker-compose 不能使用 .env 中的变量

Question

Docker Compose不能使用 .env 中的变量在 docker-compose.yml . .env与 docker-compose.yml 位于同一目录中.
.env:

port:3306

docker -compose.yml:

ports:
    - ${port}:${port}

该文档显示了完全相同的示例并说它有效

web:
    image: "webapp:${TAG}"

执行 docker-compose up 时出现错误

WARNING: The port variable is not set. Defaulting to a blank string.
ERROR: The Compose file './docker-compose.yml' is invalid because:
services.mariadb.ports is invalid: Invalid port ":", should be [[remote_ip:]remote_port[-remote_port]:]port[/protocol]

如何解决？

Answer 1

来自 https://docs.docker.com/compose/env-file/ :

Syntax rules

These syntax rules apply to the .env file:

• Compose expects each line in an env file to be in VAR=VAL format.
• Lines beginning with # are processed as comments and ignored.
• Blank lines are ignored.
• There is no special handling of quotation marks. This means that they are part of the VAL.

在 .env , 使用 =而不是 :