Esteemed Colleagues:

I created a file in /tmp and was surprised to find it gone after I rebooted, as I see nothing in /usr/lib/tmpfiles.d or in /usr/lib/systemd/system or in /etc/init or in /etc/rc?.d that removes files from /tmp. The /tmp directory is part of the root filesystem and is not memory-based. I want files in /tmp to survive a reboot and therefore want to suppress their removal; where are they being removed? The relevant line from /etc/os-release is VERSION="19.1 (Tessa)". Thank you in advance for any and all replies. jay at m5 dot chicago dot il dot us

See here: https://refspecs.linuxfoundation.org...s/ch03s18.html

In short, don't put stuff you want to keep in there.

With that said, you're looking for this:
https://www.freedesktop.org/software...ean.timer.html

1 members found this post helpful.

Yes, but as I wrote in my original posting:

"I see nothing in /usr/lib/tmpfiles.d ...
that removes files from /tmp"

The relevant line from /usr/lib/tmpfiles.d/tmp.conf is:

D /tmp 1777 root root -

The hyphen at the end of the line means that no
automatic deletion is done. I do not recall editing
this file (and I would not, I would copy it into
/etc/tmpfiles.d and edit the copy), so therefore
that is what you will find in every LinuxMint 19.1
system. My original question stands: What is causing
the files in /tmp to not survive a reboot on a
LinuxMint 19.1 system? Thank you in advance for
any and all replies.

/tmp is (usually) a part of RAM mounted into the filesystem. It's volatile. It goes "poof" when you switch the machine off.
You could change that, but if you need to ask, better don't, and simply put your stuff elsewhere.
How about creating a directory "~/tmp" (in your $HOME) that conatins the sort of stuff you want to put in it?

Are you 100% sure of this?

Please post the output of df

yeah check your fstab and see if it is your /tmp is put to RAM.

tmpfs /tmp

btw /tmp is short for temporary. get the hint?

You might find this discussion interesting; https://serverfault.com/questions/37...cleared/377349
It is a bit old, but answers your question for most distros on how /tmp is cleared. You may find the last post is the way to go.

/tmp is not usually in /etc/fstab.

the output of should shed some light.

If /etc/fstab is not showing much, and mount is showing too much then try;
df -h

On systems with SSDs I explicitly mount /tmp to ramfs - it doesn't just get done "automatically". I'm running Debian

I recall reading /tmp (normally) gets wiped between reboots - /var/tmp is remains until a process or user deletes it.

Gentlemen:

As I mentioned in the original posting (and as noted by
rkelsen): "The /tmp directory is part of the root
filesystem and is not memory-based". Thus:

$ df /tmp
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/landru-mint 15481840 13016744 1678664 89% /
$

On LinuxMint 19.1, /tmp is not a separate mountpoint.

(Incidentally, /etc/init is almost completely gone in
LinuxMint 19.1; on my system it contains only
anacron.conf and lightdm.conf. This is to be expected,
as LinuxMint 19.1 runs systemd, not upstart:

$ ls -l /sbin/init
lrwxrwxrwx 1 root root 20 Jun 26 19:39 /sbin/init -> /lib/systemd/systemd
$
)

Files that I create in /tmp on a LinuxMint 19.1 system
do not survive a reboot. Where is this done?

Thank you in advance for any and all replies.

jay at m5 dot chicago dot il dot us

The /tmp files are cleared differently by different distros, take a look at this link for the various ways: https://serverfault.com/questions/37...cleared/377349

Agree, I've installed a few distros and seen in there fstab where they have actually added /tmp to tmpfs

(no i am not going to go back and install every distro I've ever tried to find it, )

The article points out distros handle it differently, but many of the responses are dated 2012,15,17... ie) debian uses systemd , -

/etc/default/rcS

this is from an init system.

I've added this myself on a specific system. Does an installation actually just arbitrarily consume RAM for /temp storage? Did it give you any options or choices? or do you just loose the RAM no matter what? ...regardless how little/much you have or drive partitioning schemes.