如何在 docker compose 文件中转义 $ 美元符号? [英] How can I escape a $ dollar sign in a docker compose file?

问题描述

当我尝试评估我的 docker-compose.yml 文件时，我有一个 YAML 标量抛出以下错误:

I have a YAML scalar that is throwing the following error when I try to evaluate my docker-compose.yml file:

错误:环境"选项的插值格式无效服务time_service":${Time.now}"

ERROR: Invalid interpolation format for "environment" option in service "time_service": "${Time.now}"

YAML:

---
version: '2'
services:
  time_service:
    build: "."
    environment:
      TIME: "${Time.now}"

如何保持与写入相同的字符串输出，但避免让 docker-compose 将其解释为错误的字符串插值?

How can I maintain the same string output as written, but avoid having the docker-compose interpret it as faulty string interpolation?

推荐答案

当您的配置需要时，您可以使用 $$(双美元符号)字面上的美元符号.

You can use a $$ (double-dollar sign) when your configuration needs a literal dollar sign.

您正在使用 docker-compose 变量替换，这是有据可查的 这里:

You are hitting the docker-compose variable substitution, which is well documented here:

支持 $VARIABLE 和 ${VARIABLE} 语法.不支持扩展的 shell 样式功能，例如 ${VARIABLE-default} 和 ${VARIABLE/foo/bar}.

Both $VARIABLE and ${VARIABLE} syntax are supported. Extended shell-style features, such as ${VARIABLE-default} and ${VARIABLE/foo/bar}, are not supported.

当您的配置需要文字美元符号时，您可以使用 $$(双美元符号).这也可以防止 Compose 插入值，因此 $$ 允许您引用不想由 Compose 处理的环境变量.

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.

docker-compose 是用 Python 编写的，正如您在 github 上看到的那样，得到特殊字符本义的倍增机制在很多程序中都能找到，我自己在编程的时候就需要用到这个，早在1984年.

docker-compose is written in Python, as you see on github, the doubling mechanism to get the original meaning of special characters can be found in many programs, I needed to use this myself, while programming, as far back in 1984.

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