docker-compose.yml content-如何避免“必须是映射而不是字符串"错误信息? [英] docker-compose.yml content - How can i avoid "must be a mapping not a string" error message?

问题描述

问题:以下内容返回服务'image'必须是映射而不是字符串".我尝试使用YAML分析器( http://yaml-online-parser.appspot.com/)，但未返回任何错误.

Problem: the below content returns "service 'image' must be a mapping not a string." I tried using YAML Parser(http://yaml-online-parser.appspot.com/), but it returned no error.

version: 
     "2.0"

services:

 blog:

 image: 
  abc/defg
 environment:
  APPLICATION_SECRET:
   82xxxxxxx

  ports: -"9000:9000"

工作版本:

version: "2.1"
services:
 blog:
  image:  abc/defg
  environment:
   APPLICATION_SECRET:
    82xxx
  ports: 
   - "9000:9000"
networks:
  default:
    external:
      name: nat

推荐答案

如果您查看从

If you look at the Python output that you get from the online parser, you can see that you get

'ports': '-"9000:9000"'

看起来不像端口号列表.

which doesn't look like a list of port numbers.

序列元素由一个破折号和一个空格表示，如果您在破折号后的 ports 之后输入该空格:

A sequence element is indicated by a dash followed by a space, and if you input that space after the dash following ports:

ports: - "9000:9000"

您实际上确实会出错，因为作为值的块序列不能在键之后开始，而必须在它们自己的一行上开始:

You actually do get an error, as block sequences that are values cannot start after the key, but must start on a line of their own:

ports:
- "9000:9000"

尽管序列中的元素必须缩进，但连字符不一定必须缩进，只需将其与元素分隔至少一个空格即可.

Although the element in the sequence have to be indented, the dash doesn't have to be, it just needs to be separated from the element by at least one space.

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