将参数传递给 docker-compose 命令

Question

我有Docker文件：

FROM python:3.8

ARG CMD_ARGS=$CMD_ARGS
ENV PYTHONUNBUFFERED 1

COPY ./requirements.txt /requirements.txt
RUN pip install -r /requirements.txt

RUN mkdir /app
COPY . /app
WORKDIR /app

和Docker-compose.yml文件：

version: '3'

services:
  selenium:
    image: selenium/standalone-chrome
    ports:
    - 4444:4444
    restart: always

  app:
    build:
      context: .
    volumes:
    - .:/app
    command: sh -c "python3 my_script.py -arg1 -arg2"
    depends_on:
      - selenium

有没有办法不在 docker-compose.yml 文件中对 arg1、arg2 进行硬编码，而是将其传递到 docker-compore up 命令或使用环境变量（包含空格的参数字符）不知何故？

Answer 1

您可以尝试 Variable substitution 处理您的情况。

来自文档的示例：

db:
  image: "postgres:${POSTGRES_VERSION}"

When you run docker-compose up with this configuration, Compose looks for the POSTGRES_VERSION environment variable in the shell and substitutes its value in. For this example, Compose resolves the image to postgres:9.3 before running the configuration.

If an environment variable is not set, Compose substitutes with an empty string. In the example above, if POSTGRES_VERSION is not set, the value for the image option is postgres:.

或者将变量传递给 command 您可以使用 $$.

You can use a $$ (double-dollar sign) when your configuration needs a literal dollar sign. This also prevents Compose from interpolating a value, so a $$ allows you to refer to environment variables that you don’t want processed by Compose.

示例：

app:
  command: sh -c "python3 my_script.py $$VAR_ARG_1"

并且在 cli 上，您需要设置 VAR_ARG_1 变量。

将参数传递给 docker-compose 命令

Pass parameters to docker-compose command

python

environment-variables

docker

docker-compose