Ubuntu Desktop 20.04の/tmpの削除の設定を確認します。
記事の目次
systemdへの登録有無を確認する！
systemdに/tmp削除のサービスが登録されていることを確認します。
# systemctl list-unit-files | grep systemd-tmpfiles | sort systemd-tmpfiles-clean.service static enabled systemd-tmpfiles-clean.timer static enabled systemd-tmpfiles-setup-dev.service static enabled systemd-tmpfiles-setup.service static enabled
サービスの起動状態を確認する！
/tmpの削除に関しては、「systemd-tmpfiles-clean.service」と「systemd-tmpfiles-clean.timer」が担っています。
# systemctl status systemd-tmpfiles-clean.service
● systemd-tmpfiles-clean.service - Cleanup of Temporary Directories
Loaded: loaded (/lib/systemd/system/systemd-tmpfiles-clean.service; static; vendor preset: enabled)
Active: inactive (dead) since Fri 2022-12-09 20:27:23 JST; 10h ago
TriggeredBy: ● systemd-tmpfiles-clean.timer
Docs: man:tmpfiles.d(5)
man:systemd-tmpfiles(8)
Process: 17408 ExecStart=/usr/bin/systemd-tmpfiles --clean (code=exited, status=0/SUCCESS)
Main PID: 17408 (code=exited, status=0/SUCCESS)
Warning: journal has been rotated since unit was started, output may be incomplete.
# systemctl status systemd-tmpfiles-clean.timer
● systemd-tmpfiles-clean.timer - Daily Cleanup of Temporary Directories
Loaded: loaded (/lib/systemd/system/systemd-tmpfiles-clean.timer; static; vendor preset: enabled)
Active: active (waiting) since Fri 2022-12-09 20:12:20 JST; 11h ago
Trigger: Sat 2022-12-10 20:27:23 JST; 13h left
Triggers: ● systemd-tmpfiles-clean.service
Docs: man:tmpfiles.d(5)
man:systemd-tmpfiles(8)
Warning: journal has been rotated since unit was started, output may be incomplete.
# systemctl status systemd-tmpfiles-setup-dev.service
● systemd-tmpfiles-setup-dev.service - Create Static Device Nodes in /dev
Loaded: loaded (/lib/systemd/system/systemd-tmpfiles-setup-dev.service; static; vendor preset: enabled)
Active: active (exited) since Fri 2022-12-09 20:12:18 JST; 11h ago
Docs: man:tmpfiles.d(5)
man:systemd-tmpfiles(8)
Process: 450 ExecStart=/usr/bin/systemd-tmpfiles --prefix=/dev --create --boot (code=exited, status=0/SUCCESS)
Main PID: 450 (code=exited, status=0/SUCCESS)
Warning: journal has been rotated since unit was started, output may be incomplete.
# systemctl status systemd-tmpfiles-setup.service
● systemd-tmpfiles-setup.service - Create Volatile Files and Directories
Loaded: loaded (/lib/systemd/system/systemd-tmpfiles-setup.service; static; vendor preset: enabled)
Active: active (exited) since Fri 2022-12-09 20:12:20 JST; 11h ago
Docs: man:tmpfiles.d(5)
man:systemd-tmpfiles(8)
Process: 994 ExecStart=/usr/bin/systemd-tmpfiles --create --remove --boot --exclude-prefix=/dev (code=exited, statu>
Main PID: 994 (code=exited, status=0/SUCCESS)
Warning: journal has been rotated since unit was started, output may be incomplete.
serviceへの登録内容を確認する！
「systemd-tmpfiles --clean」を実行していることが分かります。
# cat /usr/lib/systemd/system/systemd-tmpfiles-clean.service # SPDX-License-Identifier: LGPL-2.1+ # # This file is part of systemd. # # systemd is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by # the Free Software Foundation; either version 2.1 of the License, or # (at your option) any later version. [Unit] Description=Cleanup of Temporary Directories Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8) DefaultDependencies=no Conflicts=shutdown.target After=local-fs.target time-set.target Before=shutdown.target [Service] Type=oneshot ExecStart=systemd-tmpfiles --clean SuccessExitStatus=DATAERR IOSchedulingClass=idle
起動タイミングを確認する！
起動タイミングは、ブート後15分とその後1日おきになります。
# cat /usr/lib/systemd/system/systemd-tmpfiles-clean.timer # SPDX-License-Identifier: LGPL-2.1+ # # This file is part of systemd. # # systemd is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by # the Free Software Foundation; either version 2.1 of the License, or # (at your option) any later version. [Unit] Description=Daily Cleanup of Temporary Directories Documentation=man:tmpfiles.d(5) man:systemd-tmpfiles(8) [Timer] OnBootSec=15min OnUnitActiveSec=1d
削除の設定を確認する！
# cat /usr/lib/tmpfiles.d/tmp.conf # This file is part of systemd. # # systemd is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by # the Free Software Foundation; either version 2.1 of the License, or # (at your option) any later version. # See tmpfiles.d(5) for details # Clear tmp directories separately, to make them easier to override D /tmp 1777 root root - #q /var/tmp 1777 root root 30d
/tmpの状態を確認する！
/tmpを確認すると、1日以内に作成されたファイルしか存在していないことが分かります。
# date 2022年 12月 10日 土曜日 08:02:39 JST # ls -l /tmp total 52 -rw------- 1 usradmin usradmin 0 12月 9 20:12 config-err-6SJBjM drwx------ 5 root root 4096 12月 9 20:12 snap-private-tmp drwx------ 2 usradmin usradmin 4096 12月 9 20:12 ssh-tH6hDX60WvzF drwx------ 3 root root 4096 12月 9 20:12 systemd-private-d88328f367714c3f88b004ea22daa7ba-colord.service-FwatIg drwx------ 3 root root 4096 12月 10 07:49 systemd-private-d88328f367714c3f88b004ea22daa7ba-fwupd.service-b8RuNf drwx------ 3 root root 4096 12月 9 20:12 systemd-private-d88328f367714c3f88b004ea22daa7ba-ModemManager.service-tbWGSf drwx------ 3 root root 4096 12月 9 20:12 systemd-private-d88328f367714c3f88b004ea22daa7ba-openvpn-client@client.service-aqCqUg drwx------ 3 root root 4096 12月 9 20:12 systemd-private-d88328f367714c3f88b004ea22daa7ba-switcheroo-control.service-YE97Fi drwx------ 3 root root 4096 12月 9 20:12 systemd-private-d88328f367714c3f88b004ea22daa7ba-systemd-logind.service-t2vVAi drwx------ 3 root root 4096 12月 9 20:12 systemd-private-d88328f367714c3f88b004ea22daa7ba-systemd-resolved.service-09SGKf drwx------ 3 root root 4096 12月 9 20:12 systemd-private-d88328f367714c3f88b004ea22daa7ba-systemd-timesyncd.service-avTj0e drwx------ 3 root root 4096 12月 9 20:12 systemd-private-d88328f367714c3f88b004ea22daa7ba-upower.service-KX3pzi drwx------ 2 usradmin usradmin 4096 12月 9 20:35 tracker-extract-files.1000 drwx------ 2 root root 4096 12月 9 20:12 vmware-root
tmp.confの設定方法を確認する！
manコマンドで、「tmp.conf」の設定方法を確認できます。様々なタイプの一時ファイルの作成と削除を、「tmp.conf」の設定で行うことができます。
# man tmpfiles.d
おわりに
/tmpの配下のファイルは、systemdで管理されたサービスにより自動で削除されていきます。
参考情報
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