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建立公钥私钥

，分别创建两个用户zhw与zhw2.

1.将zhw中生成的公钥（id_ras.pub）拷贝到zhw2中

[zhw@localhost ~]$ ssh-copy-id -i .ssh/id_rsa.pub zhw2@192.168.163.122 -p 4                                                               4444

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

[sudo] password for zhw:
/bin/ssh-copy-id: INFO: Source of key(s) to be installed: ".ssh/id_rsa.pub"
/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out                                                                any that are already installed
/bin/ssh-copy-id: INFO: 2 key(s) remain to be installed -- if you are prompted n                                                               ow it is to install the new keys
zhw2@192.168.163.122's password:

Number of key(s) added: 2

Now try logging into the machine, with:   "ssh -p '44444' 'zhw2@192.168.163.122'                                                               "
and check to make sure that only the key(s) you wanted were added.

2.将zhw2中生成的公钥（id_ras.pub）按步骤1拷贝到zhw1中

遇到问题

提示

/usr/bin/ssh-copy-id: ERROR: failed to open ID file ‘.ssh/id_rsa.pub’:

Permission denied

没权限，加sudo

[zhw@localhost ~]$ sudo ssh-copy-id -i .ssh/id_rsa zhw2@192.168.163.122 -p 44444

如果还需要输入密码，检查本用户下.ssh下文件的所属，可能被root了。

$ sudo chown user /home/user/.ssh/id_rsa

$ sudo chgrp user /home/user/.ssh/id_rsa