如何在Dockerfile中使用here-strings？ [英] how to use here-strings in the Dockerfile?

问题描述

我正在尝试使用Dockerfile在debian：buster中安装mysql-server，如以下代码所示：

I am trying to install mysql-server in debian:buster using Dockerfile as you can see in the following code :

Dockerfile：

Dockerfile:

From debian:buster

RUN apt update

RUN apt install -y gnupg wget lsb-release

RUN wget https://dev.mysql.com/get/mysql-apt-config_0.8.13-1_all.deb

RUN printf "1\n1\n4\n" | dpkg -i mysql-apt-config_0.8.13-1_all.deb

RUN apt update

RUN debconf-set-selections <<< 'mysql-community-server mysql-community-server/root-pass password your_password'

RUN debconf-set-selections <<< 'mysql-community-server mysql-community-server/re-root-pass password your_password'

RUN apt-get -y install mysql-server

CMD bash

，我想非交互地安装它（不问任何配置问题），所以我使用了debconf命令，可以这样做，但是当我尝试在Dockerfile中使用RUN运行它时，它不起作用，并且在构建过程中发生了此错误：

and I wanted to install it non-interactively (without being asked any configuration questions), so I used debconf command, to do that but It doesn't work when I try to run it with RUN in the Dockerfile and this error occurs during the build :

那么如何在Dockerfile中使用here字符串？

So how can I use the here-strings in the Dockerfile?

推荐答案

您不需要这里的字符串。

You don't need here-strings. You are already using the alternative earlier in your Dockerfile.

RUN printf '%s\n' 'mysql-community-server mysql-community-server/root-pass password your_password' | debconf-set-selections
RUN printf '%s\n' 'mysql-community-server mysql-community-server/re-root-pass password your_password' | debconf-set-selections

echo 不会在其他符合POSIX的实现中表现一致；宁可使用 printf 。

echo doesn't behave consistently across otherwise POSIX-compliant implementations; prefer printf instead.

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