Permissions 0644 for '/home/admin/.ssh/id_rsa' are too open.

拷贝本机的id_rsa文件到服务器执行 git clone命令的时候出现以下的异常

Permissions 0644 for '/home/admin/.ssh/id_rsa' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.
bad permissions: ignore key: /home/admin/.ssh/id_rsa
Enter passphrase for key '/home/admin/.ssh/id_rsa':
Permission denied (publickey).
fatal: Could not read from remote repository.

出现以上的错误，需要将私钥的权限降级到0600，执行以下命令即可。

chmod 0600 id_rsa

参考资料：ssh-keygen 密钥