Added xrootd service to the transfer node docker container.

# Check for updates and install them

RUN yum -y update

# Install epel repo

RUN yum -y install epel-release

# Install xrootd-server package

RUN yum -y install xrootd-server

# Copy authentication directives config file and set the right permissions

COPY auth_file /etc/xrootd/

RUN chown xrootd:xrootd /etc/xrootd/auth_file && \

    chmod 0644 /etc/xrootd/auth_file

# Create a new user called centos, create the home directory and set the default shell

RUN useradd -m -s /bin/bash centos

# Set the HOME as working directory

WORKDIR $HOME

# Execute a bash shell

CMD /bin/bash

# Copy xrootd main config file into the current work dir

COPY xrootd.cfg .

# Create a dir to store and expose data

RUN mkdir data

# Execute xrootd service to expose data

CMD /bin/xrootd -c xrootd.cfg ${HOME}/data

# All users have can do anything to 'data'

u * /home/centos/data/ a 

# Host role

all.role server

# Default is /tmp

all.export /home/centos/data

# Default xrd port

xrd.port 1094

# Enable access control

ofs.authorize

# Authentication directives config file

acc.authdb /etc/xrootd/auth_file