使用官方php docker映像并在启动时运行memcached

我有一个基于php:5.5.36-apache映像的docker文件，用于创建专门用于开发的映像。我的Dockerfile安装了memcached，但我没有运气让memcached在启动时启动。如果我ssh到容器中并手动启动memcached，那么它就可以正常启动

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

---

基本映像基于debian:jessie

php:5.5.36-apache有一个名为apache2前台的bash脚本，它使用

exec

启动apache，该脚本在Dockerfile的末尾用

CMD[“apache2前台”]

调用。这是Docker在启动时将执行的一个脚本，

exec

命令将执行传递给系统

我的解决方案是复制

apache2前台

脚本，并在apache启动之前启动memcached。我的解决方案很不雅观，我不建议对任何类型的生产服务器执行此操作。由于这是一个用作本地开发服务器的映像，因此满足了我的需要

更新后的apache2前台： #!/bin/bash set-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

与：

---

对于基于ubuntu的Dockerfile中的php5、apache2和memcached，这个链接对我同样适用：

安装主管

RUN apt-get install -y supervisor

并在Dockerfile中配置：

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"]

此链接还说明了如何在容器中运行多个服务：

---

你跑错了。RUN帮助您安装和配置所需的软件，添加/复制添加文件，ENV定义您的环境变量，CMD和ENTRYPOINT启动您的东西，因此它们在Mysql docker映像中启动mysqld，在apache docker映像中启动apache，等等。我在Dockerfile中没有看到CMD或ENTRYPOINT。检查文档，我开始使用的图像有一个启动apache的CMD，这确实是让我困惑的部分。看看下面我的答案，我现在好多了。

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"]