tmpfs

tmpfs is a common name for a temporary file storage facility on many Unix-like operating systems. It is intended to appear as a mounted file system, but stored in volatile memory instead of a persistent storage device. A similar construction is a RAM disk, which appears as a virtual disk drive and hosts a disk file system.

• tmpfs [EN] @ Wikipedia
• tmpfs [DE] @ Wikipedia

Examples

Define /tmp, /var/tmp and /dev/shm as tmpfs in /etc/fstab

tmpfs  /tmp      tmpfs  noatime,nodiratime,nodev,nosuid,noexec,size=1G  0  0
tmpfs  /var/tmp  tmpfs  noatime,nodiratime,nodev,nosuid,size=2G         0  0
shm    /dev/shm  tmpfs  noatime,nodiratime,nodev,nosuid,noexec,size=1G  0  0