Linux下SSH远程不用密码登陆

SSH登录命令
ssh root@10.168.10.1
这时候会让你输入密码

命令格式为:ssh 用户@主机IP

不用密码登陆的过程如下：

原理是在远程主机上添加本地生成公钥，这样会自动验证，就不需要输入密码了

1 本地SSH-keygen

[root@localhost ~]# ssh-keygen -t rsa
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:
90:b0:f3:63:1b:9e:95:42:7f:15:95:7b:19:2a:29:a0 root@localhost.localdomain

然后我们到该路径下可以看到生成的文件

[root@localhost ~]# cd ~/.ssh/
[root@localhost .ssh]# ls
id_rsa  id_rsa.pub

2 拷贝到远程的主机~/.ssh/下

这里可以用命令scp直接拷贝

[root@localhost ~]# scp ~/.ssh/id_rsa.pub root@10.168.10.1:~/.ssh/id_rsa.pub

3 登录远程主机

[root@localhost ~]# cd ~/.ssh
[root@localhost ~]# cat id_rsa.pub >> authorized_keys

4 降低权限

[root@localhost ~]# cd ..
[root@localhost ~]# chmod -R 0600 ~/.ssh

这样，再用ssh登陆就不用输入密码了