When does /tmp get cleared?

That depends on your distribution. On some system, it’s deleted only when booted, others have cronjobs running deleting items older than n hours.

  • On Ubuntu 14: using tmpreaper which gets called by /etc/cron.daily, configured via /etc/default/rcS and /etc/tmpreaper.conf. (Credits to this answer).
  • On Ubuntu 16: using tmpfiles.d. (Credits to this answer).
  • On other Debian-like systems: on boot (the rules are defined in /etc/default/rcS).
  • On RedHat-like systems: by age (RHEL6 it was /etc/cron.daily/tmpwatch ; RHEL7/RHEL8 and RedHat-like with systemd it’s configured in /usr/lib/tmpfiles.d/tmp.conf, called by systemd-tmpfiles-clean.service).
  • On Gentoo /etc/conf.d/bootmisc.

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