制作centos sshd 镜像

[root@b5926410fe60 /]# yum install passwd openssl openssh-server -y

启动sshd:
# /usr/sbin/sshd -D
这时报以下错误：
[root@ b5926410fe60 /]# /usr/sbin/sshd
Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_ecdsa_key
Could not load host key: /etc/ssh/ssh_host_ed25519_key

执行以下命令解决：
[root@b5926410fe60 /]# ssh-keygen -q -t rsa -b  -f /etc/ssh/ssh_host_rsa_key -N ''
[root@b5926410fe60 /]# ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''
[root@b5926410fe60 /]# ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key -N '' 

然后，修改 /etc/ssh/sshd_config 配置信息：
UsePAM yes 改为 UsePAM no
UsePrivilegeSeparation sandbox 改为 UsePrivilegeSeparation no

[root@b5926410fe60 /]# sed -i "s/#UsePrivilegeSeparation.*/UsePrivilegeSeparation no/g" /etc/ssh/sshd_config
[root@b5926410fe60 /]# sed -i "s/UsePAM.*/UsePAM no/g" /etc/ssh/sshd_config

修改完后，重新启动sshd
[root@b5926410fe60 /]# /usr/sbin/sshd -D

制作：

yum install -y passwd openssl openssh-server ssh-keygen -q -t rsa -b  -f /etc/ssh/ssh_host_rsa_key -N ''
ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N ''
ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key -N '' 

然后，修改 /etc/ssh/sshd_config 配置信息：
UsePAM yes 改为 UsePAM no
UsePrivilegeSeparation sandbox 改为 UsePrivilegeSeparation no

sed -i "s/#UsePrivilegeSeparation.*/UsePrivilegeSeparation no/g" /etc/ssh/sshd_config
sed -i "s/UsePAM.*/UsePAM no/g" /etc/ssh/sshd_config

更改root密码
passwd root
/usr/sbin/sshd -D

Dockerfile:

FROM centos:7.2.
LABEL maintainer "zhangpengzhong@datagrand.com"

RUN yum install passwd openssl openssh-server -y \
    && ssh-keygen -q -t rsa -b  -f /etc/ssh/ssh_host_rsa_key -N '' \
    && ssh-keygen -q -t ecdsa -f /etc/ssh/ssh_host_ecdsa_key -N '' \
    && ssh-keygen -t dsa -f /etc/ssh/ssh_host_ed25519_key -N '' 

RUN sed -i "s/#UsePrivilegeSeparation.*/UsePrivilegeSeparation no/g" /etc/ssh/sshd_config \
    && sed -i "s/UsePAM.*/UsePAM no/g" /etc/ssh/sshd_config

CMD /usr/sbin/sshd -D

RUN echo "root:xxxxx" |chpasswd