生成秘钥

~]# ssh-keygen -t rsa -P ''
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:HOkv0BllhGOd66BHk4Q4xxg2m/pzMQ9lQ8qCoc2dUAE root@k8s-master-160.kvm.io
The key's randomart image is:
+---[RSA 2048]----+
|  Eo** ..++.     |
| + *+*+o=+o      |
|. + *oooBo .     |
|   . . *==.      |
|  .   =oS+       |
|   .  .*...      |
|    o ..o .      |
|     o   .       |
|                 |
+----[SHA256]-----+

分发秘钥,别忘了给本机发一个

#分配给本机一个秘钥
 ~]# ssh-copy-id -i .ssh/id_rsa.pub root@IP

#拷贝到其他节点上 ，如果提示未找到.ssh目录,到/root下创建
 ~]# scp -p .ssh/authorized_keys .ssh/id_rsa{,.pub} root@IP:/root/.ssh/

 ~]# scp -p .ssh/authorized_keys .ssh/id_rsa{,.pub} root@IP:/root/.ssh/

 ~]# scp -p .ssh/authorized_keys .ssh/id_rsa{,.pub} root@IP:/root/.ssh/