linux 实现互访无需认证

由于工作关系，经常需要在非常不同的Linux服务器上转上转去，每次登陆，系统都会提示输入密码，是一件很烦的事情。后来，用SSH证书认证来取代普通的密码认证，就不用每次都输入密码了。OpenSSH允许远程执行命令，如果再加上证书使用，可以运行一些远程控制的脚本去控制许多许多机器，这个对工作非常有用

服务器端  [email protected]

客户端    [email protected]

在做实验前，先确定2台Linux服务器的连通性和ssh连通性

# 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:

42:98:08:15:0c:56:4b:0e:05:0e:5b:ed:1b:db:40:9f [email protected]

cd /root/.ssh/

ls

id_rsa  id_rsa.pub  known_hosts  通过此命令会生成一对共钥、私钥

ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]  复制服务器密钥到客户端

21

[email protected]'s password:

Now try logging into the machine, with "ssh '[email protected]'", and check in:

.ssh/authorized_keys

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

看到这几行配置证明，秘钥已经复制到了客户端，到客户端看看密码

ifconfig eth0

eth0      Link encap:Ethernet  HWaddr 00:0C:29:1D:30:A3  

         inet addr:192.168.0.105  Bcast:192.168.0.255  Mask:255.255.255.0

此提示为客户端的ip配置

cd /root/.ssh/

ls

authorized_keys      看到次提示，证明服务器端的ssh的秘钥，已经复制到了客户端

ssh [email protected]

Last login: Fri Aug  2 11:04:59 2013 from 192.168.0.102

ifconfig eth0

eth0      Link encap:Ethernet  HWaddr 00:0C:29:1D:30:A3  

         inet addr:192.168.0.105  Bcast:192.168.0.255  Mask:255.255.255.0

验证成功，这样就可以实现无须输入密码，就可以ssh到服务器了

本文转自 mailfile 51CTO博客，原文链接：http://blog.51cto.com/mailfile/1263197，如需转载请自行联系原作者