Linux ssh 免密码登陆

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ssh-keygen创建公钥和密钥。
ssh-copy-id 把本地主机的公钥复制到远程主机的authorized_keys文件上。
ssh-copy-id 也会给远程主机的用户主目录（home）和~/.ssh,和~/.ssh/authorized_keys设置合适的权限。

步骤1:用 ssh-keygen在本地主机上创建公钥和密钥
ligh@local-host$ ssh-keygen rsa
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
ligh@local-host

步骤2:用 ssh-copy-id把公钥复制到远程主机上
ligh@local-host$ ssh-copy-id -i~/.ssh/id_rsa.pub root@192.168.0.3
ligh@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 youweren‘t expecting.
[注: ssh-copy-id把密钥追加到远程主机的 .ssh/authorized_key上.]

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