change "/tmp" deletion from the time of boot to the time of shutting down to prevent data loss
ralf.mardorf at alice-dsl.net
Mon Jul 26 21:33:57 UTC 2021
On Mon, 26 Jul 2021 23:19:09 +0300, Nicholas Guriev wrote:
>However in general, /tmp is not intended to have important data which
>is worth regretting.
Let alone that tmp could be mounted as tmpfs, see
https://en.wikipedia.org/wiki/Tmpfs . However, even if it's not a
tmpfs, a systemd unit might clean /tmp, for Ubuntu see
Disabling or masking related systemd units should work.
An example from my Arch Linux install. It's not mounted by fstab, but
by a systemd unit.
[rocketmouse at archlinux ~]$ df -h | grep tmpfs
tmpfs 3.9G 31M 3.9G 1% /dev/shm
tmpfs 3.9G 1.9M 3.9G 1% /tmp
tmpfs 786M 104K 785M 1% /run/user/1000
[rocketmouse at archlinux ~]$ cat /etc/fstab | grep tmp
#tmpfs /tmp tmpfs nodev,nosuid,size=3G 0 0
[rocketmouse at archlinux ~]$ systemctl status tmp.mount
● tmp.mount - Temporary Directory /tmp
Loaded: loaded (/proc/self/mountinfo; static)
Active: active (mounted) since Sat 2021-07-03 21:09:58 CEST; 3 weeks 2 days ago
Tasks: 0 (limit: 9398)
Jul 03 21:09:58 archlinux systemd: Mounting Temporary Directory (/tmp)...
Jul 03 21:09:58 archlinux systemd: Mounted Temporary Directory (/tmp).
[rocketmouse at archlinux ~]$ systemctl status systemd-tmpfiles-clean
○ systemd-tmpfiles-clean.service - Cleanup of Temporary Directories
Loaded: loaded (/usr/lib/systemd/system/systemd-tmpfiles-clean.service; static)
Active: inactive (dead) since Mon 2021-07-26 21:35:55 CEST; 1h 47min ago
TriggeredBy: ● systemd-tmpfiles-clean.timer
Process: 1018193 ExecStart=systemd-tmpfiles --clean (code=exited, status=0/SUCCESS)
Main PID: 1018193 (code=exited, status=0/SUCCESS)
Jul 26 21:35:55 archlinux systemd: Starting Cleanup of Temporary Directories...
Jul 26 21:35:55 archlinux systemd: systemd-tmpfiles-clean.service: Deactivated successfully.
Jul 26 21:35:55 archlinux systemd: Finished Cleanup of Temporary Directories.
[rocketmouse at archlinux ~]$ systemctl status systemd-tmpfiles-clean.timer
● systemd-tmpfiles-clean.timer - Daily Cleanup of Temporary Directories
Loaded: loaded (/usr/lib/systemd/system/systemd-tmpfiles-clean.timer; static)
Active: active (waiting) since Sat 2021-07-03 21:09:58 CEST; 3 weeks 2 days ago
Trigger: Tue 2021-07-27 21:35:55 CEST; 22h left
Triggers: ● systemd-tmpfiles-clean.service
Jul 03 21:09:58 archlinux systemd: Started Daily Cleanup of Temporary Directories.
[rocketmouse at archlinux ~]$ man systemctl | grep " mask UNIT" -A4
Mask one or more units, as specified on the command line. This will link these unit files to /dev/null, making it impossible to start them. This is a stronger version of
disable, since it prohibits all kinds of activation of the unit, including enablement and manual activation. Use this option with care. This honors the --runtime option to
only mask temporarily until the next reboot of the system. The --now option may be used to ensure that the units are also stopped. This command expects valid unit names only,
it does not accept unit file paths
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