ssh链接：

  ssh [email protected]

  ssh -p 22222 [email protected]

输入密码登陆

ssh不用收入密码建立密钥

1、生成秘钥

[root@localhost logs]# 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:
6b:45:21:25:cf:b2:0d:ac:cd:28:d6:1a:a2:32:82:41 [email protected]
The key's randomart image is:
+--[ RSA 2048]----+
|        o.o      |
|       . = .     |
| E      + +      |
|.    . = *       |
|. . + + S o      |
|.o o +   o       |
|*   .   o        |
|o.     .         |
|                 |
+-----------------+
2、22号端口把秘钥发过去

[root@localhost logs]# ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected] 

[email protected]'s password:

3、非22号端口把秘钥发过去

[root@localhost logs]# ssh-copy-id -i ~/.ssh/id_rsa.pub '-p 22 [email protected]'
[email protected]'s password:

4.ubuntu服务器

#ssh-copy-id [email protected] -p 22

下次链接不用收入密码了！

有两个节点node1 node2，也可以是ip地址

1.在node1上生成公钥/私钥对

[hjf@node1 ~]$ ssh-keygen -t rsa12

敲3次回车在/home/hjf 目录下生成.ssh目录，里面有id_rsa，id_rsa.pub

2.把node1下的id_rsa.pub复制到node2下的.ssh/authorized_keys

[hjf@node1 ~]$ scp .ssh/id_rsa.pub hjf@node4:/home/hjf/id_rsa.pub          
hjf@node2's password:
id_rsa.pub                          100%  391     0.4KB/s   00:00                                                                                                                                                 
1234

第一次连接会输入一个密码，这里用scp复制

3.将node2中的id_rsa.pub追加到.ssh/authorized_keys里，并改变authorized_keys的权限600

[hjf@node2 ~]$ cat id_rsa.pub >>.ssh/authorized_keys
[hjf@node2 ~]$ chmod 600 .ssh/authorized_keys123

4.node1 登陆node2

ssh hjf@node2