1

This is how I create RAM disk manually on Linux Debian Jessie:

mount -o size=1G -t tmpfs none /mnt/tmpfs

My question is, how do I make this automatic at each computer startup?

2

You don't need a script for that: there's a system facility to mount a filesystem at boot time. Add it to the file /etc/fstab. Open this file in your favorite text editor and add a line like this:

none /mnt/tmpfs tmpfs size=1G

Make sure not to accidentally modify other lines.

Note that there's already a tmpfs filesystem¹ mounted at /run. Debian doesn't make /tmp tmpfs by default, but you can make it so by editing /etc/default/tmpfs and changing the RAMTMP line to

RAMTMP=yes

¹ This isn't a RAM disk: it doesn't reserve memory, only the space used for files takes up memory, and its pages can be swapped out just like application data.

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