使用官方php docker镜像并在启动时运行memcached

Question

我有一个docker文件，基于php:5.5.36-apache镜像，用于创建专门用于开发的镜像。我的Dockerfile安装了memcached，但我没有在引导时启动memcached。如果我通过ssh进入容器并手动启动memcached，它就可以正常启动。

FROM php:5.5.36-apache

RUN apt-get update \
    && apt-get install -y --no-install-recommends \
    default-jdk 
RUN apt-get install -y --no-install-recommends autoconf    
RUN apt-get install -y --no-install-recommends python python-pip

RUN apt-get update && apt-get install -y libmemcached-dev \
    apt-utils re2c g++ memcached \
    zlib1g zlib1g-dbg zlib1g-dev zlibc mysql-client php5-mysql \
    && pecl install memcached \
    && docker-php-ext-enable memcached\
    && pecl install memcache \
    && docker-php-ext-enable memcache

RUN docker-php-ext-install pdo pdo_mysql

RUN apt-get install -y gettext

RUN pip install hgapi

RUN a2enmod headers \
    && a2enmod rewrite

COPY ./apache2.conf /etc/apache2/apache2.conf

RUN mkdir /var/www/content

EXPOSE 11211

RUN systemctl enable memcached.service

基础镜像基于debian:jessie

Answer 1

这个链接对我来说适用于基于ubuntu的Dockerfile中的php5，apache2和memcached的相同问题：

https://github.com/moby/moby/issues/5137

安装supervisor

RUN apt-get install -y supervisor

并在Dockerfile中进行配置：

RUN touch  /etc/supervisor/conf.d/supervisord.conf && \
    echo "[supervisord]" >> /etc/supervisor/conf.d/supervisord.conf && \
    echo "nodaemon=true" >> /etc/supervisor/conf.d/supervisord.conf

RUN touch /etc/supervisor/conf.d/memcached.conf && \
    echo "[program:memcache]" >> /etc/supervisor/conf.d/memcached.conf && \
    echo "command=/usr/bin/memcached -m 64 -p 11211 -u memcache -l 127.0.0.1 -DFOREGROUND" >> /etc/supervisor/conf.d/memcached.conf && \
    echo "autostart=true" >> /etc/supervisor/conf.d/memcached.conf && \
    echo "autorestart=true" >> /etc/supervisor/conf.d/memcached.conf

RUN touch /etc/supervisor/conf.d/apache2.conf && \
    echo "[program:apache2]" >> /etc/supervisor/conf.d/apache2.conf && \
    echo 'command=/bin/bash -c "source /etc/apache2/envvars && exec /usr/sbin/apache2 -DFOREGROUND"' >> /etc/supervisor/conf.d/apache2.conf && \
    echo "autostart=true" >> /etc/supervisor/conf.d/apache2.conf && \
    echo "autorestart=true" >> /etc/supervisor/conf.d/apache2.conf

CMD ["/usr/bin/supervisord"]

此链接还解释了如何在容器中运行多个服务：

https://docs.docker.com/engine/admin/multi-service_container/

Answer 2

apache有一个名为apache2-foreground的bash脚本，它使用exec启动apache，该脚本在Dockerfile文件的末尾用CMD ["apache2-foreground"]调用。这是Docker将在启动时执行的脚本，exec命令将执行传递给系统。

我的解决方案是复制apache2-foreground脚本并在启动apache之前启动memcached。由于这是一个用作本地开发服务器的映像，因此满足了我的需求。

更新后的apache2-foreground：#!/bin/bash设置-e

# Apache gets grumpy about PID files pre-existing
rm -f /var/run/apache2/apache2.pid

/etc/init.d/memcached start
exec apache2 -DFOREGROUND

然后我替换了：

RUN systemctl enable memcached.service

通过以下方式：

COPY apache2-foreground /usr/local/bin/