I know it is my fault to authorize him as a superuser, and I don't have enough knowledge about CentOS 7.
As I wrote in the title, our VPS which runs CentOS 7 lost
/usr/bin by mistake. And the server doesn't respond to
ping even using its IPv4 address. Unable to access the server in the ways I know, SSH, FTP, HTTPS, SMTP, IMAP.
Are there any ways to fix this problem?
I can create a new instance, but I don't want to lose the data, especially mailboxes, MySQL stored data, web content.