问题描述
我正在尝试创建一个将自动启动apache的Dockerfile.没事.但是，如果我登录到容器并运行service apache2 start，它将起作用.为什么我不能从Dockerfile运行该命令?
I am trying to create a Dockerfile that will start apache automatically. Nothing has worked. But If I log into the container and run service apache2 start it works. Why can I not run that command from my Dockerfile?
FROM ubuntu
# File Author / Maintainer
MAINTAINER rmuktader
# Update the repository sources list
RUN apt-get update
# Install and run apache
RUN apt-get install -y apache2 && apt-get clean
#ENTRYPOINT ["/usr/sbin/apache2", "-k", "start"]
#ENV APACHE_RUN_USER www-data
#ENV APACHE_RUN_GROUP www-data
#ENV APACHE_LOG_DIR /var/log/apache2
EXPOSE 80
CMD service apache2 start
推荐答案
问题在这里:CMD service apache2 start执行此命令时，进程apache2将与外壳分离.但是Docker仅在主进程处于活动状态时才能工作.
The issue is here: CMD service apache2 start When you execute this command process apache2 will be detached from the shell. But Docker works only while main process is alive.
解决方案是在前景中运行Apache. Dockerfile必须看起来像这样:(仅更改了最后一行).
The solution is to run Apache in the foreground. Dockerfile must look like this: (only last line changed).
FROM ubuntu
# File Author / Maintainer
MAINTAINER rmuktader
# Update the repository sources list
RUN apt-get update
# Install and run apache
RUN apt-get install -y apache2 && apt-get clean
#ENTRYPOINT ["/usr/sbin/apache2", "-k", "start"]
#ENV APACHE_RUN_USER www-data
#ENV APACHE_RUN_GROUP www-data
#ENV APACHE_LOG_DIR /var/log/apache2
EXPOSE 80
CMD apachectl -D FOREGROUND
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