前些阵子对照 word 文档进行了阿里云部署的学习，结果以失败而告终。今天按照慕课网上 nodejs 线上产品部署和发布的教程来到了阿里云部署的环节。老师要求 Ubuntu 所安装的版本是 14.04, 而我之前安装的版本是 16.04，所以应该重装系统盘。步骤是来到实例列表，在操作栏的下方点击更多，先在实例状态里面选择停止，再到磁盘和镜像里面选择重装系统盘。
aliyun.gif
重装之后返回 cmd 重新输入
ssh root@'ip地址'进行远程连接，这时碰到了一个问题：
liuyuelin@liuyuelindeMacBook-Pro ⮀ ~ ⮀ ssh root@47.92.157.160
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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 ECDSA key sent by the remote host is
SHA256:v9etjDGuFPjX8KTB7/tHI00wuOY2DPifS6579rttD0c.
Please contact your system administrator.
Add correct host key in /Users/liuyuelin/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/liuyuelin/.ssh/known_hosts:4
ECDSA host key for 47.92.157.160 has changed and you have requested strict checking.
Host key verification failed.
查阅资料后，发现原因：远程的系统改变了，那么加密的密钥也改变了，所以本地已经保存的密钥就失效了，需要重新保存密钥，密钥保存的位置在/$HOME/.ssh/known_hosts
解决方法：打开 know_hosts 文件，删除系统提示错误的这一行(此处是第四行)。或者是在命令行中输入ssh-keygen -R "你的远程服务器ip地址".然后重新输入ssh root@'ip地址',输入密码即刻完成登录：
liuyuelin@liuyuelindeMacBook-Pro ⮀ ~ ⮀ ssh root@47.92.157.160
The authenticity of host '47.92.157.160 (47.92.157.160)' can't be established.
ECDSA key fingerprint is SHA256:v9etjDGuFPjX8KTB7/tHI00wuOY2DPifS6579rttD0c.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '47.92.157.160' (ECDSA) to the list of known hosts.
root@47.92.157.160's password:
Permission denied, please try again.
root@47.92.157.160's password:
Welcome to Ubuntu 14.04.5 LTS (GNU/Linux 4.4.0-93-generic x86_64)
* Documentation: https://help.ubuntu.com/
Welcome to Alibaba Cloud Elastic Compute Service !
root@iZ8vb998xn4i8tljwbdsokZ:~#
刘月林
写于湖北沙洋
2018/07/25
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