一、环境
centos7.x 三台
node1、node2、node3
二、实现免密登陆
2.1、node1上，生成公钥与私钥
[root@node1 ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
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:
SHA256:8tK4pGADFikGA7kOL55prlOJD7qxNJsVIrS3WngQYXk root@node1
The key's randomart image is:
+---[RSA 2048]----+
|=+. |
|+ooE |
|.B. |
|* + |
|=B + . S |
|*oO o = |
|+O*= + o |
|+OXo o o |
|BB . . |
+----[SHA256]-----+
2.2、node上，自己连接自己
[root@node1 .ssh]# ssh-copy-id 192.168.1.129
2.3、node1上，scp密钥到node2、node3
[root@node1 ~]# scp -pr .ssh/ 192.168.1.130:/root/
[root@node1 ~]# scp -pr .ssh/ 192.168.1.131:/root/
2.3、检验是否成功
[root@node1 ~]# ssh 192.168.1.130
Last failed login: Wed Sep 16 18:30:37 CST 2020 from 192.168.1.129 on ssh:notty
There were 2 failed login attempts since the last successful login.
Last login: Wed Sep 16 17:48:42 2020 from 192.168.1.1
[root@node2 ~]#
