docker-compose - YAML、Docker Compose、空格和引号

Question

什么情况下必须一种是在 YAML 文件中使用引号，特别是在使用 docker-compose 时.

例如，

service:
  image: "my-registry/repo:tag1"
  environment:
    ENV1: abc
    ENV2: "abc"
    ENV3: "a b c"

例如，如果需要空格，必须在环境变量周围使用引号，如 ENV3 中所述。 ?

Answer 1

经过一番谷歌搜索后，我找到了一个 blog post
正如我所理解的那样，这触及了这个问题。

我将在这里引用最重要的部分:

plain scalars:
- a string
- a string with a \ backslash that doesn't need to be escaped
- can also use " quotes ' and $ a % lot /&?+ of other {} [] stuff

single quoted:
- '& starts with a special character, needs quotes'
- 'this \ backslash also does not need to be escaped'
- 'just like the " double quote'
- 'to express one single quote, use '' two of them'

double quoted:
- "here we can use predefined escape sequences like \t \n \b"
- "or generic escape sequences \x0b \u0041 \U00000041"
- "the double quote \" needs to be escaped"
- "just like the \\ backslash"
- "the single quote ' and other characters must not be escaped"

literal block scalar: |
  a multiline text
  line 2
  line 3

folded block scalar: >
  a long line split into
  several short
  lines for readability

我也没有看到这样的 docker-compose 语法来设置环境变量。 Documentation建议使用简单的值，如

environment:
  - ENV1=abc
  - "ENV2=abc"

凡报价 "或 '根据我之前所说的，在这个特定示例中是可选的。

要了解如何在 env 变量中包含空格，您可以查看此 so answer