SSH免密登录

本地生成ssh密钥

ssh-keygen

成功之后会在.ssh文件夹下生成公钥id_rsa.pub和私钥id_rsa。

让远程服务器记住我们的公钥(本地执行)

ssh-copy-id user@remote -p port

到这一步已经可以免密登录了

设置别名(本地)

# .ssh/config
Host lab
 HostName remote
 User user
 Port port

现在就可以使用ssh lab命令直接登录远程服务器了

可能遇到的问题

[user@hostname ~]$ ssh root@pong
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    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
6e:45:f9:a8:af:38:3d:a1:a5:c7:76:1d:02:f8:77:00.
Please contact your system administrator.
Add correct host key in /home/hostname /.ssh/known_hosts to get rid of this message.
Offending RSA key in /var/lib/sss/pubconf/known_hosts:4
RSA host key for pong has changed and you have requested strict checking.
Host key verification failed.

解决办法:

ssh-keygen -R <host>