查看日志占用
$ journalctl --disk-usage
Archived and active journals take up 4.0G in the file system.按日期删除日志
$ sudo journalctl --vacuum-time=1w
Deleted archived journal /var/log/journal/86896ab5743643b28117425f336eead2/system@00000000000000000000000000000000-000000000000051c-00060df2925bca63.journal (72.0M).
...
Vacuuming done, freed 0B of archived journals from /run/log/journal.
Vacuuming done, freed 0B of archived journals from /var/log/journal.