使用ssh-keygen和ssh-copy-id三步实现SSH无密码登录

ssh-keygen  产生公钥与私钥对.

ssh-copy-id 将本机的公钥复制到远程机器的authorized_keys文件中，ssh-copy-id也能让你有到远程机器的home, ~./ssh , 和 ~/.ssh/authorized_keys的权利

第一步:在本地机器上使用ssh-keygen产生公钥私钥对

jsmith@local-host$ [Note: You are on local-host here]

jsmith@local-host$ ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key]

Enter passphrase (empty for no passphrase): [Press enter key]

Enter same passphrase again: [Pess enter key]

Your identification has been saved in /home/jsmith/.ssh/id_rsa.

Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub.

The key fingerprint is:

33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 jsmith@local-host

第二步:用ssh-copy-id将公钥复制到远程机器中

jsmith@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host

jsmith@remote-host's password:

Now try logging into the machine, with "ssh 'remote-host'", and check in:

.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

注意: ssh-copy-id 将key写到远程机器的 ~/ .ssh/authorized_key.文件中
第三步: 登录到远程机器不用输入密码

jsmith@local-host$ ssh remote-host

Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2

[Note: SSH did not ask for password.]

jsmith@remote-host$ [Note: You are on remote-host here]

 

另外：

ssh-copy-id -u wyz -i ~/.ssh/id_rsa.pub wyz@remote_host

上述是给wyz用户赋予无密码登陆的权利