1.生成ssh秘钥文件
1、[root@localhost ~]# ssh-keygen
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:
87:83:55:c7:db:0a:df:93:7d:c5:c5:2d:06:59:25:b6 root@localhost.localdomain
The key's randomart image is:
+--[ RSA 2048]----+
| ..o++oo|
| . .o.oo+|
| . +Eo.|
| o .. . . o|
| . S .o o o.|
| o o + o|
| ..|
| |
| |
+-----------------+
2、[root@localhost .ssh]# ls
id_rsa id_rsa.pub
2. 安装登录用户的公钥
[root@localhost .ssh]# touch authorized_keys
[root@localhost .ssh]# cat /root/qqc_id_rsa.pub >> authorized_keys
3.设置文件执行权限
[root@host .ssh]$ chmod 600 authorized_keys
[root@host .ssh]$ chmod 700 ~/.ssh
4.重启ssh服务
[root@localhost .ssh]# service sshd restart
Redirecting to /bin/systemctl restart sshd.service
5.ssh配置文件
[root@localhost .ssh]# vim /etc/ssh/sshd_config
允许root用户登录：
PermitRootLogin yes
注：禁用密码登录 PasswordAuthentication no
