错误：约束无法满足-在php：7-fpm-alpine上

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我正在考虑在fpm-alpine容器上设置laravel。遇到以下Dockerfile产生一些错误的问题...

FROM php:7-fpm-alpine

# install extensions needed for Laravel
RUN apk --update add \
  php7-mysqli \
  php7-mcrypt \
  php7-mbstring \
  rm /var/cache/apk/*

产生的错误是：

Building fpm
Step 1 : FROM php:7-fpm-alpine
 ---> 9e6811cb8bac
Step 2 : RUN apk --update add   php7-mysqli   php7-mcrypt   php7-mbstring   rm /var/cache/apk/*
 ---> Running in 87364957eb57
fetch http://dl-cdn.alpinelinux.org/alpine/v3.3/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.3/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
  /var/cache/apk/* (missing):
    required by: world[/var/cache/apk/*]
  php7-mbstring (missing):
    required by: world[php7-mbstring]
  php7-mcrypt (missing):
    required by: world[php7-mcrypt]
  php7-mysqli (missing):
    required by: world[php7-mysqli]
  rm (missing):
    required by: world[rm]
ERROR: Service 'fpm' failed to build: The command '/bin/sh -c apk --update add   php7-mysqli   php7-mcrypt   php7-mbstring   rm /var/cache/apk/*' returned a non-zero code: 5

我可以搜索这些软件包名称，并在alpine linux网站上找到它们。关于如何解决这个问题有任何想法吗？就像没有更新apt缓存...而是添加一个LS，我可以在那里看到内容：

Building fpm
Step 1 : FROM php:7-fpm-alpine
 ---> 9e6811cb8bac
Step 2 : RUN apk update
 ---> Using cache
 ---> 9ef09f3aa2a2
Step 3 : RUN ls /var/cache/apk
 ---> Running in e126a083a306
APKINDEX.5a59b88b.tar.gz
APKINDEX.7c1f02d6.tar.gz

关于如何解决此问题的任何想法？

网路

docker-php-ext-install在容器中添加工作时，我没有使用必需的...

FROM php:7-fpm-alpine

# install extensions needed for Laravel
RUN apk update \
    && apk add libmcrypt-dev \
    && docker-php-ext-install mcrypt mysqli pdo_mysql \
    && rm /var/cache/apk/*

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