Linux下git检测密钥ssh-T报Permission denied解决办法

lh@lh-virtual-machine:~$ sudo ssh -T [email protected]
The authenticity of host 'github.com (52.74.223.119)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'github.com,52.74.223.119' (RSA) to the list of known hosts.
Permission denied (publickey)

• 如图，当使用ssh -T命令查询密钥是否可用时报错。

• 解决办法：
                   

1. 原因分析：本人在使用git链接仓库时，重复创建了密钥key，即~/.ssh/id_rsa.pub已存在，此时继续使用命令： “ssh-keygen -t rsa -C "git的邮箱" ” 创建密钥时会提示是否覆盖

   lh@lh-virtual-machine:~$ ssh-keygen -t rsa -C "[email protected]"
   Generating public/private rsa key pair.
   Enter file in which to save the key (/home/lh/.ssh/id_rsa): 
   /home/lh/.ssh/id_rsa already exists.
   Overwrite (y/n)? y
   Enter passphrase (empty for no passphrase): 
   Enter same passphrase again: 
   Saving key "/home/lh/.ssh/id_rsa" failed: Permission denied

   确认覆盖提示没有权限，于是自己使用了sudo ssh-keygen -t rsa -C "[email protected]"
   但是保存key的默认路径却变成了如下：

   Enter file in which to save the key (/root/.ssh/id_rsa):

   继续回车，于是创建的key被保存到了/root/.ssh/id_rsa，而在查看key的时候复制了 /home/lh/.ssh/id_rsa下的key到github的仓库。

2. 探索发现：

     在执行ssh -T命令时加sudo，系统执行的是/root/.ssh/id_rsa下的key去匹配；

     不加sudo，系统执行的是/home/lh/.ssh/id_rsa下的key；

3. lh@lh-virtual-machine:~$ cat .ssh/id_rsa.pub 
   ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCd1dmFkr8fXsVha+5ZprIJ/ox11Ghx3TtjI4h8TpG7wePIWjHSJ/v6jm6u5GA4/CwiBNVd7eQyNvjkwfxWLWnoXkEPYV/9Q3bEFauOtiHfbZn9osn2hBp2xKjX6cR3mok0xsBfgj14hbFoEXRwskKzyYlwWgP6ignPvkWVYX+hR2Z8DSnMJfn6xKbQOTR9WirNMOeXT+PDvyuLnfHY0E11yN+E1tZYs+FW/RhHXYT1PDXHL7mMjZ/WFOn9PxzO7TFYR2b2KQQgaETx1931cKInM0KDJLdKG5B1tSv/q5/d8jTyzPsCRQzyG7CEKOPtsBFQxLDraOThv0qOVu9kpGCX [email protected]
   lh@lh-virtual-machine:~$ ssh -T [email protected]
   The authenticity of host 'github.com (52.74.223.119)' can't be established.
   RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
   Are you sure you want to continue connecting (yes/no)? yes
   Warning: Permanently added 'github.com,52.74.223.119' (RSA) to the list of known hosts.
   Hi lihengsss! You've successfully authenticated, but GitHub does not provide shell access.

   使用~/下的key，添加到github上，不加sudo执行ssh -T，检查密钥为可用。