ssh免密码登录

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示例：两台linux主机，主机A要免密码登录到主机B

1、准备工作

  • 两台linux主机A、B(也可以是虚拟机)

2、密钥文件生成

生成A，B两机器的各自密钥文件，生成方法如下：

[root@hangzhi ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): #按回车键跳过
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): #按回车键跳过
Enter same passphrase again: #按回车键跳过
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:AAH7q02rnbC3EFBrwhoBQuPzQ1NPRM9fnw3aQAnl/PU root@hangzhi
The key's randomart image is:
+---[RSA 2048]----+
|*oo.ooo+  .oo.   |
|+o.o..o o  +.    |
|+++o  .. o  +.. .|
|.=+..  .  . .=.o+|
|. .o.   S  .. ooE|
|   ...           |
|  o o            |
|   O.o           |
|  +o*.           |
+----[SHA256]-----+

3、配置密钥文件

示例是主机A要免密码登录到主机B，所以要在主机B的认证文件中配置主机A的密钥

在主机B上编辑/root/.ssh/authorized_keys文件， 将主机A的/root/.ssh/id_rsa.pub的密钥粘贴进去即可