配置ssh免密登陆：客户端主机通过redhat用户基于秘钥验证方式进行远程连接服务器的root用户

服务器root用户：

[root@localhost ~]# ifconfig
ens160: flags=4163  mtu 1500
        inet 192.168.146.128  netmask 255.255.255.0  broadcast 192.168.146.255
        inet6 fe80::20c:29ff:fe2c:de8  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:2c:0d:e8  txqueuelen 1000  (Ethernet)
        RX packets 309  bytes 30419 (29.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 247  bytes 24604 (24.0 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
 
lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 17  bytes 2039 (1.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 17  bytes 2039 (1.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

客户端：

创密钥：

[redhat@localhost root]$ ssh-keygen

密钥：

[redhat@localhost root]$ ll /home/redhat/.ssh
总用量 8
-rw-------. 1 redhat redhat 2622  3月 14 20:55 id_rsa
-rw-r--r--. 1 redhat redhat  582  3月 14 20:55 id_rsa.pub

传密钥给服务器root用户：

[redhat@localhost root]$ ssh-copy-id root@192.168.146.128

远程连接服务器root用户：

[redhat@localhost root]$ ssh 'root@192.168.130.128'
Activate the web console with: systemctl enable --now cockpit.socket
 
Register this system with Red Hat Insights: insights-client --register
Create an account or view all your systems at https://red.ht/insights-dashboard
Last failed login: Tue Mar 14 20:59:14 CST 2023 from 192.168.130.129 on ssh:notty
There was 1 failed login attempt since the last successful login.
Last login: Tue Mar 14 20:51:16 2023 from 192.168.146.1
[root@localhost ~]#