Linux———ssh密钥管理

1.生成公钥

[root@localhost ~]# ssh-keygen -t rsa
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:
6c:cc:03:bb:0f:98:1a:ae:0d:6b:7a:38:09:9c:3a:1c root@localhost
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|                 |
|      .          |
|       *         |
|. .   . S        |
|.E   o o .       |
|=oo o o          |
|*B.o   o         |
|*=+     .        |
+-----------------+

2.将公钥传给客户端

[root@localhost ~]# ls /root/.ssh/
authorized_keys  id_rsa  id_rsa.pub  known_hosts
[root@localhost ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub dss@172.25.254.79
/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: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
dss@172.25.254.79's password: 
Permission denied, please try again.
dss@172.25.254.79's password: 

或者用其余共享方式传送密钥文件

[root@localhost ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub dss@172.25.254.79
/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: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
dss@172.25.254.79's password: 

再重启sshd服务后生效

在客户端:

[root@foundation79 .ssh]# mv id_rsa.pub authorized_keys 
[root@foundation79 .ssh]# ssh root@172.25.254.141
Connection closed by 172.25.254.141