两台CentOS7：
youxi1 192.168.2.103
youxi2 192.168.2.104
[root@localhost ~]# 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:s3UfKpok75/reD0KNwOi/M2nonkALSVbXr1foBG7rB0 root@localhost.localdomain
The key's randomart image is:
+---[RSA 2048]----+
| ... |
| . o . o.. |
| B . .+ . |
| + o .o. . |
| o . E.... . |
| ... + *.. o . |
| o.o = =.. . |
| oo* *o=o |
| oo.oX**o . |
+----[SHA256]-----+
[root@localhost ~]# ls /root/.ssh/
id_rsa id_rsa.pub
接着使用命令ssh-copy-id命令将公钥发到192.168.2.104服务器上
[root@localhost ~]# ssh-copy-id -i .ssh/id_rsa.pub root@192.168.2.104
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: ".ssh/id_rsa.pub"
/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@192.168.2.104's password: Number of key(s) added: 1
Now try logging into the machine, with: "ssh 'root@192.168.2.104'"
and check to make sure that only the key(s) you wanted were added. [root@localhost ~]# ssh root@192.168.2.104
Last login: Mon Oct 4 01:20:33 2021 from 192.168.2.103
[root@localhost ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:55:b1:20 brd ff:ff:ff:ff:ff:ff
inet 192.168.2.104/24 brd 192.168.2.255 scope global noprefixroute dynamic ens33
valid_lft 6313sec preferred_lft 6313sec
inet6 fe80::b92a:baa7:4873:a720/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft forever
inet6 fe80::90dc:b1a9:5062:45c1/64 scope link tentative noprefixroute dadfailed valid_lft forever preferred_lft forever
inet6 fe80::e3cb:dc5:77b8:7e6a/64 scope link noprefixroute valid_lft forever preferred_lft forever
[root@localhost ~]# exit
登出
Connection to 192.168.2.104 closed.
[root@localhost ~]#
