Linux+

The best solution for a systems administrator to access the graphical user environment of a Linux machine remotely is VNC (Virtual Network Computing). VNC is a graphical desktop-sharing system that uses the Remote Frame Buffer protocol to remotely control another computer. It is specifically designed for accessing graphical interfaces over networks and is widely used for its ease of setup and use. KDE is a desktop environment and not a remote access solution. X11 is a protocol for windowing systems but is not as straightforward for remote graphical access as VNC. RPC (Remote Procedure Call) is meant for executing code on a different computer and does not handle graphical interfaces.

The error 'No space left on device' despite having 20GB of free space is typically indicative of an issue with inodes rather than actual storage space. Each file on a filesystem requires an inode to store metadata about the file. If a filesystem runs out of inodes, it cannot create new files regardless of available storage space. This situation aligns very well with the symptoms described in the question.

The best reason for not storing database files in the /var directory is that if log files fill up /var, it might corrupt the database. The /var directory is commonly used for storing variable data like logs, mail spools, and temporary files that can grow in size dynamically and unexpectedly. If this directory fills up due to extensive logging or other variable data, it can lead to insufficient space for the database files, risking corruption or failure of database operations. Ensuring dedicated storage for databases helps prevent such scenarios and maintains stability and integrity of the database.