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Dockerfile文档中定制镜像出现错误，求大神指导！

### 使用Dockerfile安装swoole

### Swoole版本，PHP版本，以及操作系统版本信息
php:7.4.12
swoole 4.6.4
linux

### 相关代码
Dockerfile文档代码如下

FROM php:7.4.12-apache
RUN apt-get update \
    && apt-get -y install libpng-dev libcurl4-openssl-dev \
    && docker-php-ext-install gd curl pdo pdo_mysql\
    && apt-get autoclean

ENV DEBIAN_FRONTEND noninteractive
ENV TERM            xterm-color

ARG DEV_MODE
ENV DEV_MODE $DEV_MODE

COPY ./rootfilesystem/ /

RUN \
    curl -sfL https://getcomposer.org/installer | php -- --install-dir=/usr/bin --filename=composer && \
    chmod +x /usr/bin/composer                                                                     && \
    composer self-update 2.0.11                                                    && \
    apt-get update              && \
    apt-get install -y             \
        libcurl4-openssl-dev       \
        libssl-dev                 \
        supervisor                 \
        unzip                      \
        zlib1g-dev                 \
        --no-install-recommends && \
    install-swoole.sh 4.6.4 \
        --enable-http2   \
        --enable-mysqlnd \
        --enable-openssl \
        --enable-sockets --enable-swoole-curl --enable-swoole-json && \
    mkdir -p /var/log/supervisor && \
    rm -rf /var/lib/apt/lists/* $HOME/.composer/*-old.phar /usr/bin/qemu-*-static

ENTRYPOINT ["/entrypoint.sh"]

### 你期待的结果是什么？实际看到的错误信息又是什么？

W: Failed to fetch http://deb.debian.org/debian/dists/buster/InRelease  Could not connect to deb.debian.org:80 (151.101.110.132), connection timed out
W: Failed to fetch http://deb.debian.org/debian/dists/buster-updates/InRelease  Unable to connect to deb.debian.org:http:
W: Some index files failed to download. They have been ignored, or old ones used instead.
Reading package lists...
Building dependency tree...
Reading state information...
Package libpng-dev is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libpng-dev' has no installation candidate

求大神指导！

发布于3年前 · 2 次浏览 · 来自提问

liaoshu