journal ログをすべて削除する方法

• 概要
• 環境
• 全削除
• そもそも保存させる容量を調整する
• 最後に
• 参考サイト

概要

忘れるのでメモ

環境

• Ubuntu 22.04

全削除

前

sudo du -sh /var/log/
3.3G    /var/log/

• sudo journalctl --vacuum-time=1s

削除ログ

Vacuuming done, freed 0B of archived journals from /run/log/journal.
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/user-1002@cb5cf46ac4024d6ab8ac0f7039ee62f0-000000000279f7c3-00063ffa5ec9cd0c.journal (8.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000027b400b-00064004588b93b5.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000027d6843-000640152308d284.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000027f9176-00064025f94a8e93.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-000000000281b863-00064036e00660b8.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-000000000283e0cf-00064047f2873c97.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000028609f5-00064058f8e381d0.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000028834bc-0006406a1746446c.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000028a5e91-0006407b42809cd3.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000028c873b-0006408c87b6d808.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/user-1002@cb5cf46ac4024d6ab8ac0f7039ee62f0-00000000028e2463-0006409965aaafa8.journal (8.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000028eb3bd-0006409dca5e037c.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-000000000290dc16-000640ae8e9c7381.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/user-1002@cb5cf46ac4024d6ab8ac0f7039ee62f0-0000000002912098-000640b0a2d36d3b.journal (8.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-0000000002930478-000640bf5eb5c522.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/user-1002@cb5cf46ac4024d6ab8ac0f7039ee62f0-0000000002936af1-000640c27aa7db32.journal (8.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-0000000002952cde-000640d027fee751.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-000000000297559b-000640e0f3a72cf5.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-0000000002997e37-000640f1d327fe5d.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000029ba58e-00064102c1378bd0.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000029dce0e-00064113bde6de0a.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-00000000029ff7c5-00064124cc9e6f43.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-0000000002a2215b-00064135ea1f4111.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-0000000002a44b4b-000641471cc25b72.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-0000000002a6736b-00064158657fee95.journal (128.0M).
Deleted archived journal /var/log/journal/95b2c59cdf7701096ea7d3386e92e124/system@6e6c307cc5634e74888ce601b9437fcf-0000000002a89d70-00064169c011da77.journal (128.0M).
Vacuuming done, freed 2.7G of archived journals from /var/log/journal/95b2c59cdf7701096ea7d3386e92e124.
Vacuuming done, freed 0B of archived journals from /var/log/journal.

後

sudo du -sh /var/log/
443M    /var/log/

微妙に残ります
インスタンス自体を再起動すると更に減ります

du 以外にも journalctl 専用のコマンドでログの使用量を確認することもできます

• sudo journalctl --disk-usage

Archived and active journals take up 136.0M in the file system.

そもそも保存させる容量を調整する

• sudo vim /etc/systemd/journald.conf

[Journal]
SystemMaxUse=100M

• sudo systemctl restart systemd-journald

ちなみに SystemMaxUse のデフォルトはディスクサイズの10%なので30GBのディスクであれば3.0GBほど保存します

最後に

だいたい dockerd のログでうまります

参考サイト

• https://linux.just4fun.biz/?Linux環境設定/ジャーナルファイルを削除したい場合・journalctl