Chained RUN commands

restyaboard/Dockerfile

 FROM centos:7
 
-# update package
-RUN yum update -y
-RUN yum install -y git bzip2 postgresql cronie
-
 # add repository
-RUN rpm --import http://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-7
-RUN rpm -ivh http://ftp-srv2.kddilabs.jp/Linux/packages/fedora/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
-RUN sed -i 's/^enabled=1$/enabled=0/g' /etc/yum.repos.d/epel.repo
-RUN rpm --import http://rpms.famillecollet.com/RPM-GPG-KEY-remi
-RUN rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
-
-# install nginx
+RUN \
+rpm --import http://dl.fedoraproject.org/pub/epel/RPM-GPG-KEY-EPEL-7; \
+rpm -ivh http://ftp-srv2.kddilabs.jp/Linux/packages/fedora/epel/7/x86_64/e/epel-release-7-5.noarch.rpm; \
+sed -i 's/^enabled=1$/enabled=0/g' /etc/yum.repos.d/epel.repo; \
+rpm --import http://rpms.famillecollet.com/RPM-GPG-KEY-remi; \
+rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
 COPY etc/yum.repos.d/nginx.repo /etc/yum.repos.d/
-RUN yum install -y --enablerepo=nginx nginx
-
-# install postfix
-RUN yum install -y postfix
 
-# install php5.6
-RUN yum install -y --enablerepo=remi-php56\
- php php-fpm php-pgsql php-mbstring php-pecl-imagick
-RUN sed -i 's/^user = apache$/user = nginx/g' /etc/php-fpm.d/www.conf
-RUN sed -i 's/^group = apache$/group = nginx/g' /etc/php-fpm.d/www.conf
-
-# install node.js
-RUN yum install -y --enablerepo=epel nodejs npm
+# update & install package
+RUN \
+yum update -y; \
+yum install -y git bzip2 cronie postfix postgresql; \
+yum install -y --enablerepo=nginx nginx; \
+yum install -y --enablerepo=remi-php56\
+ php php-fpm php-pgsql php-mbstring php-pecl-imagick; \
+yum install -y --enablerepo=epel nodejs npm
 RUN npm install -g grunt-cli
 
+# setting php-fpm
+RUN \
+sed -i 's/^user = apache$/user = nginx/g' /etc/php-fpm.d/www.conf; \
+sed -i 's/^group = apache$/group = nginx/g' /etc/php-fpm.d/www.conf
+
 # install restyaboard
-RUN rm -rf /usr/share/nginx/html
-RUN git clone https://github.com/RestyaPlatform/board.git\
+RUN \
+rm -rf /usr/share/nginx/html; \
+git clone https://github.com/RestyaPlatform/board.git\
  /usr/share/nginx/html
 WORKDIR /usr/share/nginx/html
-RUN cp restyaboard.conf /etc/nginx/conf.d
-RUN cp -R media /tmp
-RUN npm install
-RUN grunt build:live
-RUN echo '*/5 * * * * php /usr/share/nginx/htmlserver/php/R/shell/cron.php'\
+RUN \
+cp restyaboard.conf /etc/nginx/conf.d; \
+cp -R media /tmp; \
+npm install; \
+grunt build:live; \
+echo '*/5 * * * * php /usr/share/nginx/htmlserver/php/R/shell/cron.php'\
  > /var/spool/cron/root
 
 # volume