linux 禁用密码登陆 启用ssh key登陆 配置

1.在服务器上执行

#ssh-keygen -t rsa -C 793413226@qq.com

输入文件名（如xxxx）和私钥密码，并二次确认

会生成2个文件：xxxx,xxxx.pub

将公钥写入/root/.ssh/authorized_keys文件，将私钥xxxx下载到本地留作登陆使用

#cat xxxx.pub >> /root/.ssh/authorized_keys

修改配置 其实centos7.4及之后的版本只要关闭密码登录就好了，因为秘钥文件登录是默认打开的

#vim /etc/ssh/sshd_config

#禁用密码验证
PasswordAuthentication no
#启用密钥验证
RSAAuthentication yes #centos 7.4及之后的版本不用加这个
PubkeyAuthentication yes #centos 7.4及之后是默认开启的

 保存并重启sshd

#service sshd restart #centos系统

/**************************************************

ssh-keygen -t rsa -C 793413226@qq.com

[root@wzj home]# ssh-keygen -t rsa -C 793413226@qq.com
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): wzjroot
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in wzjroot.
Your public key has been saved in wzjroot.pub.
The key fingerprint is:
SHA256:P0PVjNZ5yw523CXeD+0nFwstCXeuLyr+d2f8rNknLrw 793413226@qq.com
The key's randomart image is:
+---[RSA 2048]----+
| |
| = . |
| .+.*.o|
| oo.B=+|
| S . *oO+|
| o . Bo+|
| +. ..+=|
| . ooooB*|
| ..ooE+*=B|
+----[SHA256]-----+

**************************************************/