Docker 错误：使用 apk 时无法满足的约束答案

【问题标题】：Docker ERROR: unsatisfiable constraints when using apkDocker 错误：使用 apk 时无法满足的约束
【发布时间】：2020-08-01 04:18:05
【问题描述】：

我将它用作我的 Dockerfile。在构建它时，代码存在于第 2 步。

FROM python:3.7-alpine
RUN apk update && apk add --no-cache gcc libffi-dev g++ python-dev build-base linux-headers postgresql-dev postgresql-contrib pcre-dev bash alpine-sdk jpeg-dev zlib-dev \ && pip install wheel

COPY ./requirements.txt .

RUN pip install -r requirements.txt

这是我在终端上得到的

Building web
Step 1/18 : FROM python:3.7-alpine
 ---> 7fbc871584eb
Step 2/18 : RUN apk update && apk add --no-cache gcc libressl libffi-dev g++ python-dev build-base linux-headers postgresql-dev postgresql-contrib pcre-dev bash alpine-sdk jpeg-dev zlib-dev \ && pip install wheel
 ---> Running in 102a327c46d9
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/APKINDEX.tar.gz
v3.11.5-56-gd94bd50429 [http://dl-cdn.alpinelinux.org/alpine/v3.11/main]
v3.11.5-54-g70c5111c08 [http://dl-cdn.alpinelinux.org/alpine/v3.11/community]
OK: 11274 distinct packages available
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
   (missing):
    required by: world[]
ERROR: Service 'web' failed to build: The command '/bin/sh -c apk update && apk add --no-cache gcc libressl libffi-dev g++ python-dev build-base linux-headers postgresql-dev postgresql-contrib pcre-dev bash alpine-sdk jpeg-dev zlib-dev \ && pip install wheel' returned a non-zero code: 1

我的 Docker 版本 19.03.3

【问题讨论】：

标签： docker dockerfile docker-image docker-build

【解决方案1】：

你只是在RUN 命令中有一个不必要的\，就在pip install wheel 之前。删除它，它会工作。

RUN apk update && apk add --no-cache gcc libffi-dev g++ python-dev build-base linux-headers postgresql-dev postgresql-contrib pcre-dev bash alpine-sdk jpeg-dev zlib-dev && pip install wheel

【讨论】：

对，或者实际上将第二部分放在下一行，这是反斜杠的目的。