1 生成公私密钥对
[atguigu@hadoop102 .ssh]$ ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/home/atguigu/.ssh/id_dsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/atguigu/.ssh/id_dsa.
Your public key has been saved in /home/atguigu/.ssh/id_dsa.pub.
The key fingerprint is:
25:0a:23:7f:a7:f0:d1:78:f6:59:57:e3:cc:78:49:d0 atguigu@hadoop102
The key's randomart image is:
+--[ DSA 1024]----+
| .. |
| .E |
| . o . . o.|
| o o + o *.o|
| o = S ...* |
| + * . o .. |
| o o |
| |
| |
+-----------------+
[atguigu@hadoop102 .ssh]$ ssh-copy-id hadoop103
/usr/bin/ssh-copy-id: ERROR: No identities found再生成密钥对后，将其复制给另一台机器hadoop103时报错如下：
/usr/bin/ssh-copy-id: ERROR: No identities found网上有提及到是因为没有生成密钥对的原因。
显然我不是该原因，后面提及如下：
接着发现缺少公钥路径，通过 -i 加上即可：
$ ssh-copy-id -i ~/.ssh/id_dsa.pub user@remote_ip
我尝试之后，解决了
[atguigu@hadoop102 .ssh]$ ssh-copy-id -i ~/.ssh/id_dsa.pub atguigu@hadoop103
atguigu@hadoop103's password:
Now try logging into the machine, with "ssh 'atguigu@hadoop103'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
[atguigu@hadoop102 .ssh]$ ssh-copy-id -i ~/.ssh/id_dsa.pub atguigu@hadoop104
atguigu@hadoop104's password:
Now try logging into the machine, with "ssh 'atguigu@hadoop104'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
[atguigu@hadoop102 .ssh]$ ssh hadoop104
Last login: Fri Dec 28 03:39:18 2018 from 192.168.31.1
[atguigu@hadoop104 ~]$ exit
logout
Connection to hadoop104 closed.
[atguigu@hadoop102 .ssh]$ ssh hadoop103
Last login: Fri Dec 28 03:39:18 2018 from 192.168.31.1
[atguigu@hadoop103 ~]$ exit
logout
Connection to hadoop103 closed.