通过ssh登录centos7

1.执行指令

ssh-keygen -t rsa

==使用rsa协议生成公匙和私匙==
2.三次确认，使用默认存放位置，密码为空，确认密码为空

[root@iZbp1gg50ddqbgxf1jpqwwZ ~]# ssh-keygen -t rsa
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:
SHA256:291afX8QKD/Ys+Ji/tbtKyC/lZXfSNoqmV6IVlFiy/U root@iZbp1gg50ddqbgxf1jpqwwZ
The key's randomart image is:
+---[RSA 2048]----+
|          o o    |
|         o = .   |
|          +  .E  |
|          ... .. |
|        S .=  +. |
|        .=oo=B.+.|
|        +oo=*==.=|
|       .o Bo++. +|
|       o.*=+ooo.o|
+----[SHA256]-----+

3./root/.ssh 公匙和私匙存放位置

[root@iZbp1gg50ddqbgxf1jpqwwZ .ssh]# ll
total 8
-rw------- 1 root root    0 Jan 16 21:37 authorized_keys
-rw------- 1 root root 1679 Jan 20 15:40 id_rsa
-rw-r--r-- 1 root root  410 Jan 20 15:40 id_rsa.pub

4.开放公匙登录服务器

cat id_rsa.pub >> authorized_keys

来源：https://www.cnblogs.com/jenkins/p/12228559.html