Docker生成带有SSH功能的镜像

cat Dockerfile
FROM centos:7.5.1804
MAINTAINER ljx
#安装ssh
RUN yum install -y openssh-server
RUN sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config
RUN yum install -y openssh-clients

#配置root名
RUN echo "root:Lahmy1c!" | chpasswd
RUN echo "root ALL=(ALL) ALL" >> /etc/sudoers
#生成ssh key
RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
RUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key

#配置sshd服务
RUN mkdir /var/run/sshd
EXPOSE 22
ENTRYPOINT ["/usr/sbin/sshd", "-D"]