配置Linux免密码登陆

[配置Linux 免密码登陆](#配置Linux 免密码登陆)[1 生成秘钥对，一路回车就好](#<strong>1 生成秘钥对，一路回车就好</strong>)
[２ 修改公钥名称为authorized_keys](#<strong>２ 修改公钥名称为authorized_keys</strong>)
[3 修改权限为600](#<strong>3 修改权限为600</strong>)
[4 修改sshd配置文件](#<strong>4 修改sshd配置文件</strong>)
[5 重启sshd服务](#<strong>5 重启sshd服务</strong>)

配置Linux 免密码登陆
友情提示：如果需要实现xshell 等终端工具实现免密码登陆的，在生成密钥对的时候，务必先把id_rsa就拷贝出来，不然到时候你配置好了的时候，通过xftp等工具拷贝文件出来，发现本地没有密钥文件，到时候就是死循环了。切记切记！！

1 生成秘钥对，一路回车就好
[root@localhost ~]# ssh-keygen

Generating public/private rsa key pair.

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

Created directory '/root/.ssh'.

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:

92:98:a4:6d:a3:bf:04:67:f5:5f:d9:e2:9f:e1:b8:c1 root@localhost.localdomain

The key's randomart image is:

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

| |

| |

| . . |

| + + o o |

| o O o S + . |

| * . . . + . |

| . . . E . |

| o = o |

| o. o.+ |

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

[root@localhost ~]#

２ 修改公钥名称为authorized_keys
[root@localhost .ssh]# cd /root/.ssh/

[root@localhost .ssh]# cat id_rsa.pub >authorized_keys

3 修改权限为600
[root@localhost .ssh]# chmod 600 authorized_keys

4 修改sshd配置文件
[root@localhost .ssh]# vi /etc/ssh/sshd_config

RSAAuthentication yes

PubkeyAuthentication yes

AuthorizedKeysFile .ssh/authorized_keys

PasswordAuthentication no

5 重启sshd服务
[root@localhost .ssh]# service sshd restart

Stopping sshd: [ OK ]

Starting sshd: [ OK ]

[root@localhost .ssh]#

最后拷贝is_rsa 到任意地方保存即可实行无密码登陆