Linux之sshkey密钥认证实战

　　在实际的生产环境中，经常会用到sshkey密钥认证实行数据分发数据等操作，还可以批量操作内网服务器，实行免密认证进行推送分发数据。

1、环境查看

分发服务器

节点服务器

2、服务器添加系统账号

3、生成密钥对

[root@localhost1 ~]# su - fenfa

[fenfa@localhost1 ~]$ whoami

fenfa

[fenfa@localhost1 ~]$ ssh-keygen -t dsa

　Generating public/private dsa key pair.
Enter file in which to save the key (/home/fenfa/.ssh/id_dsa):
Created directory '/home/fenfa/.ssh'.　　#创建目录
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/fenfa/.ssh/id_dsa.
Your public key has been saved in /home/fenfa/.ssh/id_dsa.pub.
The key fingerprint is:
2c:33:62:96:d5:5a:56:a8:19:63:29:de:63:35:83:f1 fenfa@localhost1
The key's randomart image is:
+--[ DSA 1024]----+
| .+ .. |
| . *o=. |
| . +.*Eo |
| .o*= |
| =.=.S |
| o . + |
| |
| |
| |
+-----------------+
[fenfa@localhost1 ~]$ cd /home/fenfa/.ssh/
[fenfa@localhost1 .ssh]$ ls -ld .ssh
ls: cannot access .ssh: No such file or directory
[fenfa@localhost1 .ssh]$ ls -ld /home/fenfa/.ssh/
drwx------ 2 fenfa fenfa 4096 Feb 21 00:25 /home/fenfa/.ssh/
[fenfa@localhost1 .ssh]$ ll
total 8
-rw------- 1 fenfa fenfa 668 Feb 21 00:25 id_dsa
-rw-r--r-- 1 fenfa fenfa 606 Feb 21 00:25 id_dsa.pub

[fenfa@localhost1 .ssh]$ cat /home/fenfa/.ssh/id_dsa

-----BEGIN DSA PRIVATE KEY-----

MIIBuwIBAAKBgQDLu2NAZzbTkIb5qAXlFEEud/Ka3dS37dSzIgpkWeX5M65niDgJ

NoXybn5t14YC5Ur7ef1MXQWsTJlzz1Y6+2MXNUnqnttIsbFGqPFCxfITDCryE9xZ

L16LF7LLFcYyAiXDNJApQXRfnt8p4+5NYEx7WUtRnFhcAyolGCKGV9FlpQIVAPd4

UIqd7o3o3z+R8JbB0kB7uQmzAoGAb7DhH9aXMrDCERjr3u3kb6/P5yKl1h4Bx/Il

k6Ye/hmly5jPk2ylwifPb0iVHVfKvREVGEQ84SUkYzGhAkws1hcrEp9auunzYDNP

Sw8rTRwnGHe+jeSJpMFyE/XiAdLm9dlvNubgcprAhrY7j2dgM6lMzI4Wzx64yPm5

qqEF3AwCgYAswJiFXDeTFDumtSeAYwukCbuYFmuOZFep17Vo+5GO/EYmhv0WLkry

mfkWIgzeq9RfiDj2jVGxMPwRdfIqqeThzrs8nJKNgIwhI8yN/EcjwdHA9iwkMWng

+eXweI3JLGwAwOi8K0E5daJe6QyXZO67nlZt6RPsnnOZzsgdqIrtkwIVAK4QeeT/

lrNTWfo0hWEh7DPEGHsx

-----END DSA PRIVATE KEY-----

4、分发密钥

分发的命令格式
ssh-copy-id -i 密钥名称用户@远端主机 IP 地址--------------用于 ssh 是默认端口
ssh-copy-id -i 密钥名称 “-p port 用户@远端主机 IP 地址”--用于 ssh 非默认端口

[fenfa@localhost1 .ssh]$ ssh-copy-id -i id_dsa.pub fenfa@192.168.181.129　　#分发的命令

The authenticity of host '192.168.181.129 (192.168.181.129)' can't be established.

RSA key fingerprint is 9e::e9:::a0:::2b:d0:4e:ae:d4::6f:0d.

Are you sure you want to continue connecting (yes/no)? y

Please type 'yes' or 'no': yes

Warning: Permanently added '192.168.181.129' (RSA) to the list of known hosts.

fenfa@192.168.181.129's password:

Permission denied, please try again.

fenfa@192.168.181.129's password:

Permission denied, please try again.

fenfa@192.168.181.129's password:

Now try logging into the machine, with "ssh 'fenfa@192.168.181.129'", and check in:

  .ssh/authorized_keys

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

[fenfa@localhost1 .ssh]$ ssh-copy-id -i id_dsa.pub fenfa@192.168.181.129

Now try logging into the machine, with "ssh 'fenfa@192.168.181.129'", and check in:

  .ssh/authorized_keys

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

查看是否分发成功

[fenfa@localhost2 ~]$ tree /home/fenfa/.ssh/

/home/fenfa/.ssh/

└── authorized_keys　　分发成功

 directories,  file

5、分发数据

不需要输入密码

当每天都需要分发数据时，可以把命令写入脚本中，再加入定时任务，就可以自动分发数据。