inspired from http://forums.debian.net/viewtopic.php?t=16450

/etc/default/tmpfs

# Where to mount the DIRS
# if empty, defaults to /dev/shm
MNT_TMPFS="/dev/shm"
 
# Set directories to be mounted in tmpfs
# /var/log is not recommended!
# /etc/default/rcS for /var/run and /var/lock
DIRS="/tmp /var/log /var/run /var/lock"
 
# Mount options for tmpfs
# if empty, defaults to rw,nodev,nosuid
# if you want to set the size= option, you need to do it in
#/etc/default/tmpfs
OPTS_TMPFS="nodev,noexec"
 
# SHM_SIZE sets the maximum size (in bytes) that the /dev/shm tmpfs can use.
# If this is not set then the size defaults to the value of TMPFS_SIZE
# if that is set; otherwise to the kernel's default.
#
# The size will be rounded down to a multiple of the page size, 4096 bytes.
SHM_SIZE=
 
# "quiet mount" will pass the -n option to the mount command
# mount(8) for more information
# Leave empty to unset
#QUIET=""