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In a password protected area you can install for instance or to allow someone access to the database without giving them SSH access, but that won't allow them to upgrade the OS for you. Almost regardless of how much you trust the developer, make a good backup beforehand of your system, settings and data....


Google Authenticator is time-dependent. Make sure your date/time settings, from the server and the phone, (also including their timezones) are correct.


No, you're allowing someone you don't trust to have root access to your servers. which means they can install a rat in the system or mess with it. you can log files accessed and permissions by creating an account and pass for the person but since he will need root access he can log in and then start deleting your monitoring system. which leaves you to ...

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