[root@aniu-saas-1 ~]# ssh-keygen -t rsa -P ‘‘
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory ‘/root/.ssh‘.
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:
c5:76:18:5a:c0:33:b7:8f:03:b9:a2:fe:df:16:50:1a root@aniu-saas-1
The key‘s randomart image is:
+--[ RSA 2048]----+
| ...o |
| E+oo |
| .O=.. |
| =o.. |
| S+ o |
| . . + . |
| . . o |
| . .. |
| ........ |
+-----------------+
[root@aniu-saas-1 ~]# touch ~/.ssh/authorized_keys
[root@aniu-saas-1 ~]# cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
[root@aniu-saas-1 ~]# chmod 600 ~/.ssh/authorized_keys
[root@aniu-saas-1 ~]# vim /etc/ssh/sshd_config
RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys
[root@aniu-saas-1 ~]# systemctl restart sshd
[root@aniu-saas-1 ~]# ssh root@10.26.100.30 ‘cat >> ~/.ssh/authorized_keys‘ < ~/.ssh/id_rsa.pub
‘cat >> ~/.ssh/authorized_keys‘ < ~/.ssh/id_rsa.pub的作用是，将本地的公钥文件~/.ssh/id_rsa.pub，重定向追加到远程文件authorized_keys。
[root@aniu-saas-1 ~]# ssh root@10.26.100.20 ‘ps ax | grep mysql‘
3680 ? Ss 0:00 bash -c ps ax | grep mysql
3696 ? S 0:00 grep mysql
原文地址：http://crist.blog.51cto.com/8175849/1982093
