Unknown instruction: YUM while building Docker image

My Docker file:

FROM remote-host

COPY ./conf/nginx.repo /etc/yum.repos.d/nginx.repo

RUN
  yum -y install nginx-1.12.2 openssl --enablerepo=nginx &&
  yum -y install https://centos7.iuscommunity.org/ius-release.rpm &&
  yum -y install https://dl.iuscommunity.org/pub/ius/stable/CentOS/7/x86_64/ius-release -1.0-14.ius.centos7.noarch.rpm &&
  yum -y install
   php71u-fpm
   php71u-cli
   php71u-mysqlnd
   php71u-soap
   php71u-xml
   php71u-zip
   php71u-json
   php71u-mcrypt
   php71u-mbstring
   php71u-zip
   php71u-gd
    --enablerepo=ius && yum clean all

EXPOSE 80 443

VOLUME /war/www/html /var/log/nginx /var/log/php-fpm /var/lib/php-fpm

COPY ./conf/nginx.conf /etc/nginx/conf.d/default.conf

COPY ./bin/start.sh /start.sh

RUN chmod +x /start.sh'

I am trying to install the PHP packages by running the docker file to create an image.

But while running Docker-compose getting the below error:

Building remote_host
Sending build context to Docker daemon  5.632kB
Step 1/8 : FROM centos
 ---> 5d0da3dc9764
Step 2/8 : RUN yum -y install openssh-server
 ---> Using cache
 ---> f35cb2e631df
Step 3/8 : RUN useradd remote_user &&     echo "remote_user:1234" | chpasswd &&     mkdir /home/remote_user/.ssh &&     chmod 700 /home/remote_user/.ssh
 ---> Using cache
 ---> cd43cbb20a17
Step 4/8 : COPY remote-key.pub /home/remote_user/.ssh/authorized_keys
 ---> Using cache
 ---> 265df27dac01
Step 5/8 : RUN chown remote_user:remote_user -R /home/remote_user/.ssh/ &&     chmod 700 /home/remote_user/.ssh/authorized_keys
 ---> Using cache
 ---> ede2d6bc1ca1
Step 6/8 : RUN ssh-keygen -A
 ---> Using cache
 ---> d2285793a0a0
Step 7/8 : RUN yum -y install mysql
 ---> Using cache
 ---> 5e32bcb6c255
Step 8/8 : CMD /usr/sbin/sshd -D
 ---> Using cache
 ---> 96a4c1781a8f
Successfully built 96a4c1781a8f
Successfully tagged remote-host:latest
Building web
Sending build context to Docker daemon  8.192kB
Error response from daemon: dockerfile parse error line 6: unknown instruction: YUM
ERROR: Service 'web' failed to build : Build failed

You have syntax errors in your Dockerfile. You can't put commands across multiple lines in a Dockerfile without escaping the end-of-line. That is, you can't write this:

RUN
  yum -y install nginx-1.12.2 openssl --enablerepo=nginx &&
  yum -y install https://centos7.iuscommunity.org/ius-release.rpm

But you can write this:

RUN yum -y install nginx-1.12.2 openssl --enablerepo=nginx &&  yum -y install https://centos7.iuscommunity.org/ius-release.rpm

Or you can write this:

RUN \
  yum -y install nginx-1.12.2 openssl --enablerepo=nginx && \
  yum -y install https://centos7.iuscommunity.org/ius-release.rpm

Here, we use the \ character to escape the end-of-line, allowing us to spread a command across multiple physical lines in our Dockerfile.

So your first RUN command should probably look like:

RUN \
  yum -y install nginx-1.12.2 openssl --enablerepo=nginx && \
  yum -y install https://centos7.iuscommunity.org/ius-release.rpm && \
  yum -y install https://dl.iuscommunity.org/pub/ius/stable/CentOS/7/x86_64/ius-release -1.0-14.ius.centos7.noarch.rpm && \
  yum -y install \
   php71u-fpm \
   php71u-cli \
   php71u-mysqlnd \
   php71u-soap \
   php71u-xml \
   php71u-zip \
   php71u-json \
   php71u-mcrypt \
   php71u-mbstring \
   php71u-zip \
   php71u-gd \
    --enablerepo=ius && yum clean all