Linux SSH免密码登陆

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最新推荐文章于 2025-03-26 01:30:53 发布

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分类专栏： Linux ssh 免密码登陆 centos7

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本文详细介绍了如何在 CentOS 7 上配置 SSH 免密码登录，包括生成密钥、导入密钥、添加主机名和 IP 到 hosts 文件、分发密钥到其他主机等步骤。

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centos7配置ssh免密码登陆

1.生成密钥，执行命令sh-keygen -t rsa，默认回车

[root@master ~]# ssh-keygen -t rsa
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:
SHA256:mD7BQPCmXfPwkK1OnT9HVFHFYHFNEwia1nSb6UFR1RE root@master
The key's randomart image is:
+---[RSA 2048]----+
|  ...      o.+XE#|
|   o   o  = o++.=|
|    + * .+ ..=   |
|   + + @.. .. .  |
|  . . B S   ..   |
|     + . . .     |
|      +   o .    |
|       .   o     |
|                 |
+----[SHA256]-----+
[root@master ~]#

2.将密钥导入到认证文件中

[root@master ~]# cd .ssh/
[root@master .ssh]# cat id_rsa.pub>>authorized_keys
[root@master .ssh]# ll
总用量 12
-rw-r--r--. 1 root root  393 7月  15 15:11 authorized_keys
-rw-------. 1 root root 1675 7月  15 15:08 id_rsa
-rw-r--r--. 1 root root  393 7月  15 15:08 id_rsa.pub
[root@master .ssh]#

3.将集群中所有主机ip地址和对应的主机名添加到hosts文件中

[root@master .ssh]# vi /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.1.101 master
192.168.1.102 slave1
192.168.1.103 slave2
192.168.1.104 slave3

4.然后将master的authorized_keys传到slave1上的.ssh目录下

[root@master .ssh]# scp -r authorized_keys root@slave1:~/.ssh
The authenticity of host 'slave1 (192.168.1.102)' can't be established.
ECDSA key fingerprint is SHA256:NmkN2Uza23ugzRxBDc/xnUDJ/YRUMNBE3DleGPhyFUo.
ECDSA key fingerprint is MD5:65:22:2c:ed:83:9c:9c:18:f9:9f:d5:d6:ab:4a:88:d7.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'slave1,192.168.1.102' (ECDSA) to the list of known hosts.
root@slave1's password:
authorized_keys                               100%  393   161.7KB/s   00:00    
[root@master .ssh]#