一，建立信任关系的2台主机都执行生成密钥
输入ssh-keygen -t rsa之后全部默认回车，这样就会在/root/.ssh下生成密钥文件
复制代码 代码示例:
[root@jbxue .ssh]# 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:
63:9f:6e:8b:98:49:e3:a2:bc:49:8a:a1:d5:1b:03:3a root@jbxue.internal.lietou.com
The key's randomart image is:
+--[ RSA 2048]----+
| |
| |
| |
| |
| . S |
| . o . o . |
|E o + o o |
|oB ..* = o. |
|+ =o..= ..o. |
+-----------------+
二，查看~/.ssh生成密钥的文件
复制代码 代码示例:
[root@jbxue .ssh]# ll
总用量 12
-rw-------. 1 root root 1675 9月 14 10:46 id_rsa
-rw-r--r--. 1 root root 419 9月 14 10:46 id_rsa.pub
-rw-r--r--. 1 root root 2360 9月 10 15:53 known_hosts
三，建立信任关系
1 A对B建立信任关系
复制代码 代码示例:
[root@jbxue .ssh]# scp -r id_rsa.pub 10.10.10.17:/root/.ssh/authorized_keys
root@10.10.10.17's password:
id_rsa.pub 100% 419 0.4KB/s 00:00
[root@jbxue .ssh]#
即：把A的公钥（id_rsa.pub)拷贝到B，并修改id_rsa.pub 为 authorized_keys
此时需要输入密码（之前未建立信任关系），建立了客户端到服务端的信任关系后，客户端就可以不用再输入密码，就可以从服务端拷贝数据。
四，在B机器上执行同样的操作
复制代码 代码示例:
[root@localhost .ssh]# ssh-keygen --help
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): ^C
[root@localhost .ssh]# 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:
b3:b4:62:1b:5a:fb:8c:70:50:6c:22:aa:11:2e:01:23 root@localhost.localdomain
The key's randomart image is:
+--[ RSA 2048]----+
|E |
|o. . |
|o . . + |
|.+ . + |
|+. . S |
|o. . . + |
|. . * o |
| * B |
| . +.o |
+-----------------+
[root@localhost .ssh]# ll
总用量 16
-rw-r--r--. 1 root root 419 9月 14 10:52 authorized_keys
-rw-------. 1 root root 1671 9月 14 10:54 id_rsa
-rw-r--r--. 1 root root 408 9月 14 10:54 id_rsa.pub
-rw-r--r--. 1 root root 2357 9月 12 14:35 known_hosts
[root@localhost .ssh]# scp -r id_rsa.pub 10.10.10.20:/root/.ssh/authorized_keys
root@10.10.10.20's password:
id_rsa.pub
五，测试
复制代码 代码示例:
[root@localhost ~]# scp -r a 10.10.10.20:/root/
a 100% 0 0.0KB/s 00:00
[root@localhost ~]# ls
双机之间拷贝文件，不再需要输入密码了，双机信任关系成功创建。
