SSH免密登录

1.环境准备

实验目标：ServerA远程免密登录到ServerB

SSH免密登录

ServerA

[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:
SHA256:DcXtto44LEYfU4M+fxW41AOGm+3LZl1v6Vx0H5csR9A root@localhost.localdomain
The key's randomart image is:
+---[RSA 3072]----+
|         ..o ..  |
|         .o + .E |
|        .. * + . |
|        .o= * * .|
|       .S..= + B+|
|      . =   + +.*|
|     . o * + + .=|
|      o = o B o.+|
|     . . . +  .+ |
+----[SHA256]-----+
[root@localhost ~]# ll .ssh/
总用量 8
-rw-------. 1 root root 2610 4月  17 21:37 id_rsa
-rw-r--r--. 1 root root  580 4月  17 21:37 id_rsa.pub

发送密钥

[root@localhost ~]# ssh-copy-id -i .ssh/id_rsa.pub root@192.168.10.202
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: ".ssh/id_rsa.pub"
The authenticity of host '192.168.10.202 (192.168.10.202)' can't be established.
ECDSA key fingerprint is SHA256:GOHvQgwN0iTiEFdJb6zEc6J3o2dNunfaOZWMpF20JXw.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@192.168.10.202's password: 

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@192.168.10.202'"
and check to make sure that only the key(s) you wanted were added.

远程登录

[root@localhost ~]# ssh root@192.168.10.202
Activate the web console with: systemctl enable --now cockpit.socket

This system is not registered to Red Hat Insights. See https://cloud.redhat.com/
To register this system, run: insights-client --register

Last login: Tue Apr 16 21:47:38 2024
[root@localhost ~]# 注销
Connection to 192.168.10.202 closed.

ServerB

[root@localhost ~]# ll .ssh/
总用量 4
-rw-------. 1 root root 580 4月  17 21:38 authorized_keys
[root@localhost ~]#