准备工作

docker pull centos 下拉镜像
docker run centos:latest /bin/bash 启动容器

容器内部安装以下依赖

$ sudo yum -y install openssh-server
$ sudo yum -y install openssh-clients
$ /usr/sbin/sshd 启动
$ /usr/sbin/sshd restart 重启
passwd
  新密码
  确认新密码

ps:只有重置密码才能使用（如提示没有passwd这个命令行使用yum install passwd安装）和 ps -aux | grep sshd 查看sshd状态或者netstat -ant |grep 22也可以,ssh默认是端口号是22

完成后重启容器

$ docker run -it -p 5000:22 contos:latest /bin/bash

ssh连接docker容器

$ ssh -p 5000 root@127.0.0.1

配置:

修改SSH配置文件以下选项，去掉#注释，将四个选项启用：

$ vi /etc/ssh/sshd_config

• RSAAuthentication yes #启用 RSA 认证
• PubkeyAuthentication yes #启用公钥私钥配对认证方式
• AuthorizedKeysFile .ssh/authorized_keys #公钥文件路径（和上面生成的文件同）
• PermitRootLogin yes #root能使用ssh登录

实录中常见错误处理:

//容器内启动sshd服务时
$ service sshd restart或者systemctl start sshd

Q报错:Failed to get D-Bus connection: Operation not permitted原因是centos7的版本问题
A解决方案:docker run 的时候运行/usr/sbin/init 。比如
docker run -tid –name hadoopbase centos/hadoopbase:v001 /usr/sbin/init
- https://github.com/docker/docker/issues/7459
- https://github.com/docker/docker/issues/2296

//容器内启动sshd服务
$ /usr/sbin/sshd 启动sshd服务

报错: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
sshd: no hostkeys available – exiting.
原因:没有host key
解决方案: 依次使用ssh-keygen生产上述不存在的文件

//本地ssh连接docker容器时报错
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
SHA256:1c8m4zKkJ/hwMyEJQ+MFRnBQYssRYhKVhmzrgsSZPd0.
Please contact your system administrator.
Add correct host key in /Users/gaosiqiang/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/gaosiqiang/.ssh/known_hosts:43
RSA host key for [127.0.0.1]:5000 has changed and you have requested strict checking.
Host key verification failed.

解决方案:
vim ~/.ssh/known_hosts
删除与连接ip相关的数据即可

拓展

ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
//rsa和dsa是两种不同的加密方式