实现两台(多台)服务器之间的无密码访问

1 登录到任意一台服务器

ssh 192.168.21.90

2 执行命令

ssh-keygen -t rsa

[root@fedora14ip90 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): twoServer
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in twoServer.
Your public key has been saved in twoServer.pub.
The key fingerprint is:
6e:0c:30:81:93:81:d3:53:0b:77:88:8d:53:5a:5a:6d root@fedora14ip90
The key's randomart image is:
+--[ RSA 2048]----+
| ooXBo.          |
|o XBo+E          |
| .o++.           |
|     o           |
|      . S        |
|       +         |
|        +        |
|       .         |
|                 |
+-----------------+
[root@fedora14ip90 ~]# 

在这个过程中输入文件名[随意即可],还有密码[随意即可]

3 到密钥文件夹下面去

引用

[root@fedora14ip90 .ssh]# cd /root/.ssh/

4 复制密钥到需要无密码访问的电脑上,有scp命令即可

scp id_rsa.pub root@192.168.21.91:/root/

scp [文件] [无密码访问的电脑的用户名(我这儿是root)]@[无密码访问的电脑的ip,不用多说]:[无密码访问的电脑的目标文件夹]
这个过程会提示输入密码,输入即可

5 登录到需要无密码访问的电脑上执行命令
cat /root/id_rsa.pub >> ~/.ssh/authorized_keys

6 成功


附:
如果需要快速的实现上面的步骤,实现A机器ssh登录B机器时候不需要密码
1 在A机器上输入命令
ssh-keygen -t rsa -P '' ~/.ssh/id_rsa
2 把生成的文件~/.ssh/id_rsa.pub拷贝到B机器上,然后做相应的操作把~/.ssh/id_rsa.pub文件内容追加到~/.ssh/authorized_keys后面