主机间无需密码基于ssh通信

node1:172.16.58.1

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node2:172.16.58.3

node1--> node2

首先在node1生成秘钥

执行命令ssh-keygen -P ''

询问保存路径直接回车默认即可，

后面提示私钥保存为/root/.ssh/id_rsa

公钥保存为/root/.ssh/id_rsa.pub

[root@node1 ~]# ssh-keygen -P ''

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

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:

dc:62:ba:81:ac:dd:d9:93:fa:b4:9b:21:8d:e7:98:8c root@node1.magedu.com

The key's randomart p_w_picpath is:

+--[ RSA 2048]----+

| |

| . . |

| S . |

| . . = . |

| o = =. |

| o + %o+ |

| . E OoBo |

+-----------------+

把秘钥传给node2主机

ssh-copy-id -i .ssh/id_rsa.pub root@172.16.58.3

[root@node1 ~]# ssh-copy-id -i .ssh/id_rsa.pubroot@172.16.58.3

The authenticity of host '172.16.58.3 (172.16.58.3)' can'tbe established.

RSA key fingerprint isdb:f8:11:fa:7d:30:95:44:1b:eb:ea:89:ee:fa:a1:27.

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

Warning: Permanently added '172.16.58.3' (RSA) to the listof known hosts.

root@172.16.58.3's password:

Now try logging into the machine, with "ssh'root@172.16.58.3'", and check in:

.ssh/authorized_keys

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

测试是否成功免密码登陆,没有提示输入密码

ssh 172.16.58.3 'date';date

[root@node1 ~]# ssh 172.16.58.3 'date';date

Wed Dec 31 16:51:41 CST 2014

Wed Dec 31 16:52:42 CST 2014

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