Jan
19
Changing The /tmp Cleanup Frequency
Filed Under Ubuntu
While the /tmp folder is not a place to store files long-term, occasionally you want to keep things a little longer than the next time you reboot, which is the default on Ubuntu systems. I know a time or two I’ve downloaded something to /tmp during testing, rebooted after making changes and then lost the original data again. This can be changed if you’d like to keep your /tmp files a little bit longer. The default on Redhat systems, for example, is to keep files roughly ten-days.
Changing the /tmp Cleanup Frequency
The default setting that tells your system to clear /tmp at reboot is held in the /etc/default/rcS file. The value we’ll look at is TMPTIME.
The current value of TMPTIME=0 says delete files at reboot despite the age of the file. Changing this value to a different (positive) number will change the number of days a file can survive in /tmp.
TMPTIME=7
This setting would allow files to stay in /tmp until they are a week old, and then delete them on the next reboot. A negative number (TMPTIME=-1) tells the system to never delete anything in /tmp. This is probably not something you want, but is available.
I have been wondering how to do this on Ubuntu and finally found it today. Enjoy.
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That’s great Christer, very handy to know!
Interesting, but I think it’s the wrong approach. Technically, you’re not guaranteed that anything in /tmp will be there even 5 minutes from now, reboot or not. It just so happens that most linux distros only clean up /tmp on reboot, but other unices aren’t so predictable. /tmp is just a bad place to put things that you don’t want to lose yet, just like the trash is a bad place to put leftovers you may or may not want to eat tomorrow. I make a ~/tmp for that purpose. I should probably find another name for it, but I haven’t had any bursts of creativity on the subject yet.
only every reboot?
Isn’t there a cron of some sort which cleans the /tmp dir too?
I’ve got my pc turned 24/7 or in suspend does that mean my tmp dir doesn’t get cleaned?
Some people have /tmp on a tmpfs, which is in RAM and thus reset at reboot…
I don’t reboot my laptop often, but when I do, /tmp might have become quite big. Not cleaning out /tmp on boot every time might actually improve boot-up times. I’ll see how it goes
@Tormod: you are right, and in fact Ubuntu’s default configuration is to put /tmp in a RAM based file system (tmpfs). So *anything* you put in /tmp will be automatically lost on reboot.
To check this on your system, just type ‘mount’ or ‘df -hT’ (h for human units, T for show types).