Dockerfile

FROM centos:8
MAINTAINER Iuliana Cosmina "iuliana@cloudsoft.io"

# CONTAINER_SERVICE_VERSION_BELOW
LABEL version="2.0.0-SNAPSHOT"

# setup root account with temporary password (optionally overridden in docker-entrypoint.sh)
RUN echo 'root:p4ssw0rd' | chpasswd

# install sshd and other frequently used packages
RUN yum -y install openssh-server which sudo; \
    mkdir /var/run/sshd ; \
    chmod 600 /var/run/sshd

# create host keys if absent
RUN if [ -f "/etc/ssh/ssh_host_dsa_key" -a -f "/etc/ssh/ssh_host_rsa_key" ] ; then \
        echo "SSH host private keys already exists" ; \
    else \
        ssh-keygen -f /etc/ssh/ssh_host_rsa_key -N '' -t rsa ; \
        ssh-keygen -f /etc/ssh/ssh_host_dsa_key -N '' -t dsa ; \
    fi

# configure sshd to allow login
RUN sed -i.bk 's/PermitRootLogin.*$/PermitRootLogin yes/g' /etc/ssh/sshd_config ; \
    echo 'PasswordAuthentication yes' >> /etc/ssh/sshd_config; \
    echo 'RSAAuthentication yes' >> /etc/ssh/sshd_config


# SSH login fix. Otherwise user is kicked off after login
RUN sed 's@session\s*required\s*pam_loginuid.so@session optional pam_loginuid.so@g' -i /etc/pam.d/sshd || true

COPY docker-entrypoint.sh /
RUN chmod 700 /docker-entrypoint.sh

EXPOSE 22

ENTRYPOINT ["/docker-entrypoint.sh"]