Dockerfile

FROM centos

MAINTAINER Gamma Gao 

# install tools
RUN yum -y update ;\
    yum -y install epel-release python-pip git openssh-server openssh-clients make wget sudo vim java-1.8.0-openjdk; \
    yum clean all  

# create user jenkinsbuild
RUN set -eux &&\ 
    useradd --create-home --no-log-init --shell /bin/bash jenkinsbuild \
    && echo 'jenkinsbuild:jenkinsbuild' | chpasswd \
    && groupadd docker \
    && usermod -aG docker jenkinsbuild \
    && usermod -aG root jenkinsbuild \
    && ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key \
    && ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key  \
    && sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config \
    && sed -i 's/PasswordAuthentication no/PasswordAuthentication yes/g' /etc/ssh/sshd_config \
    && echo 'AllowUsers jenkinsbuild' >> /etc/ssh/sshd_config \
    && mkdir /var/run/sshd \
    && sed -i 's/root	ALL=(ALL) 	ALL/root	ALL=(ALL) 	ALL\njenkinsbuild	ALL=(ALL) 	NOPASSWD: ALL/g' /etc/sudoers \
    && echo 'source /etc/profile' >> /home/jenkinsbuild/.bashrc 

# install docker client
ARG DOCKERURL=https://download.docker.com/linux/static/stable/x86_64/docker-18.03.0-ce.tgz
ARG DOCKERSHA256=e5dff6245172081dbf14285dafe4dede761f8bc1750310156b89928dbf56a9ee
RUN set -eux &&\
    curl -fSL "$DOCKERURL" -o docker.tgz \
    && echo "$DOCKERSHA256 *docker.tgz" | sha256sum -c - \
    && tar -xzvf docker.tgz \
    && mv docker/* /usr/local/bin/ \
    && rmdir docker \
    && rm docker.tgz \
    && chmod +x /usr/local/bin/docker 
   
WORKDIR /home/jenkinsbuild/ci-jenkins

# install entrypoint
COPY entrypoint.sh /usr/local/bin/ 
RUN set -eux &&\
    chown -R jenkinsbuild:jenkinsbuild /home/jenkinsbuild/ci-jenkins \
    && chmod +x /usr/local/bin/entrypoint.sh

EXPOSE 22 
   
ENTRYPOINT ["entrypoint.sh"]
CMD ["/usr/sbin/sshd", "-D"]