如何在长docker RUN命令中添加注释? [英] How can I add comments in long docker RUN commands?

问题描述

我知道在docker文件中使用运行RUN命令以减少步骤/空间的习惯.但是，随着这些内容变长，我还想添加更多注释以使命令清晰明了.

 从FROM版本:18.04ENV DEBIAN_FRONTEND =非交互式运行apt-get update \#我想评论一下此步骤在做什么&&apt-get install -y software-properties-common#斜线之前的注释在这里也不起作用\ 

允许在单个步骤旁边添加注释的docker/bash语法或docker约定是什么?如果我将注释放在上面指示的位置，则会出现错误

  $ sudo docker build.将构建上下文发送到Docker守护程序4.608kB来自守护程序的错误响应:Dockerfile分析错误行5:未知指令:&& 

从bash的角度来看，这是有道理的，但我几乎没有其他选择可以传达该行的意图.

解决方案

您只需要在一行中添加注释:

 #评论1运行apt获取更新#评论2&&apt-get install blabla blabla blabla \#评论3&&回声这不是操练 

docker删除带有换行符的注释行.

有关示例，请参见 docker-nginx ./p>

I know it's customary to have run-on RUN commands in docker files to reduce steps/space. However, as these get long, I'd also like to add more comments to make the command clear.

FROM ubuntu:18.04
ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update \   # I WANT A COMMENT on what this step is doing
 && apt-get install -y software-properties-common # comments also don't work here, before the slash \

What's the docker/bash syntax or docker convention that would allow comments next to individual steps? If I put the comment where indicated above, I get the error

$ sudo docker build .
Sending build context to Docker daemon  4.608kB
Error response from daemon: Dockerfile parse error line 5: unknown instruction: &&

Which makes sense from a bash perspective but leaves me with few options for communicating the intent of the line.

解决方案

You need to have a line with only the comment:

# comment 1
RUN apt-get update \
    # comment 2
    && apt-get install blabal blabla blabla \
    # comment 3
    && echo this is not a drill

docker removes the comment line with the newline.

See docker-nginx with examples.

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