FROM centos:centos7

# installing openssh-server
RUN yum -y update; yum clean all
RUN yum install -y openssh-server sudo
RUN sed -i 's/#PermitRootLogin yes/PermitRootLogin without-password/' /etc/ssh/sshd_config

# creating necessary folder for ssh service
RUN mkdir /var/run/sshd

# creating key
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''

# setting entrypoint for image
ENTRYPOINT ["/usr/sbin/sshd", "-D"]