linux下如何安装rar扩展参考：http://www.884358.com/php-rar/
dockerfile文件如下（红色部分为安装rar扩展增加的内容）：
FROM daocloud.io/ubuntu:trusty MAINTAINER Fernando Mayo <fernando@tutum.co>, Feng Honglin <hfeng@tutum.co> RUN sed -i 's/archive.ubuntu.com/mirrors.ustc.edu.cn/g' /etc/apt/sources.list ENV TZ=Asia/Shanghai RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone # Install packages ENV DEBIAN_FRONTEND noninteractive RUN apt-get update && \ apt-get -y install supervisor git apache2 libapache2-mod-php5 mysql-server php5-mysql pwgen php-apc php5-mcrypt \ curl php5-gd php5-curl php-pear wget tar php5-dev && \ wget http://pecl.php.net/get/rar-3.0.2.tgz && \ gunzip rar-3.0.2.tgz && \ tar -xvf rar-3.0.2.tar && \ cd rar-3.0.2 && \ phpize && \ ./configure && make && make install && \ curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer && \ apt-get -y remove vim-common && \ apt-get -y install vim && \ echo "ServerName localhost" >> /etc/apache2/apache2.conf && \ echo "extension=rar.so" >> /etc/php5/apache2/conf.d/rar.ini # Add image configuration and scripts ADD start-apache2.sh /start-apache2.sh ADD start-mysqld.sh /start-mysqld.sh ADD run.sh /run.sh RUN chmod 755 /*.sh ADD my.cnf /etc/mysql/conf.d/my.cnf ADD supervisord-apache2.conf /etc/supervisor/conf.d/supervisord-apache2.conf ADD supervisord-mysqld.conf /etc/supervisor/conf.d/supervisord-mysqld.conf
