用命令直接设置远程主机的公钥

今天在研究rsync同步的时候 发现 部署公钥不一定要到远程主机输入 可以通过命令直接复制

生成公钥

$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
38:3c:57:d5:fa:9f:77:06:2d:1a:2f:d5:b7:55:ac:fd root@iZ28cqmea34Z
The key's randomart image is:
+--[ RSA 2048]----+
|            ..   |
|           .  .  |
|          .  . . |
|     . . .  .   o|
|      = S    . =.|
|       +    . * *|
|             = +*|
|            o .oE|
|             . .o|
+-----------------+

复制公钥到目标主机

$ ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.2.200
root@192.168.2.200's password: //输入密码
Now try logging into the machine, with "ssh '用户名@远程主机'", and check in:

  .ssh/authorized_keys

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