Dockerfile

FROM centos:7

RUN useradd dev
RUN echo 'dev:mypass' | chpasswd
RUN yum install -y openssh-server rsync
RUN ssh-keygen -N '' -t rsa -f /etc/ssh/ssh_host_rsa_key && \
    ssh-keygen -N '' -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key && \
    ssh-keygen -N '' -t ed25519 -f /etc/ssh/ssh_host_ed25519_key
RUN echo /usr/sbin/sshd >> /root/.bashrc && source /root/.bashrc
RUN sed -i 's/GSSAPIAuthentication yes/GSSAPIAuthentication no/' /etc/ssh/sshd_config

RUN yum install -y epel-release
RUN yum install -y cmake3

EXPOSE 22
CMD ["/bin/bash"]

# 22 for ssh server. 7777 for gdb server.
EXPOSE 22 7777

RUN useradd -ms /bin/bash debugger
RUN echo 'debugger:pwd' | chpasswd

########################################################
# Add custom packages and development environment here
########################################################

RUN yum update -y && \
    yum install -y gcc && \
    yum install -y gcc gcc-c++ && \
    yum install -y gcc make && \
    yum install -y gcc autoconf && \
    yum install -y gcc automake && \
    yum install -y gcc libtool && \
    yum install -y gcc pkgconfig && \
    yum install -y gcc cppunit-devel && \
    yum install -y gcc python-setuptools && \
    yum install -y gcc python-devel && \
    yum install -y gcc git && \
    yum install -y gcc net-tools && \
    yum install -y gcc telnet
########################################################

CMD ["/usr/sbin/sshd", "-D"]