ssh、scp常见问题

1. UNPROTECTED PRIVATE KEY FILE

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@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @
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Permissions 0644 for '.ssh/id_rsa' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.

这个问题弄了好久，发现时权限问题。我们需要把id_rsa文件，known_hosts文件和.ssh文件夹的权限更改。

sudo chmod 600 ~/.ssh/id_rsa

sudo chmod 644 ~/.ssh/known_hosts

sudo chmod 755 ~/.ssh/

2.  REMOTE HOST IDENTIFICATION HAS CHANDED

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@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
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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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
e0:05:f2:6f:8d:18:00:ac:50:64:c6:d1:97:2d:c3:20.
Please contact your system administrator.
Add correct host key in /home/xxx/.ssh/known_hosts to get rid of this message.
Offending key in /home/xxx/.ssh/known_hosts:8
RSA host key for 10.18.28.61 has changed and you have requested strict checking.
Host key verification failed.
lost connection

只需要在.ssh/known_hosts文件中将即将登陆的远程主机的信息删除即可

如登陆 ssh bob@192.168.0.100

将本机.ssh/known_host中有192.168.0.100的信息删除即可。