5mo ago

Remember to not to forget clearing your journal

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62 comments

Cleanup
Check current disk usage:
sudo journalctl --disk-usage
Use rotate function:
sudo journalctl --rotate
Or
Remove all logs and keep the last 2 days:
sudo journalctl --vacuum-time=2days
Or
Remove all logs and only keep the last 100MB:
sudo journalctl --vacuum-size=100M
How to read logs:
Follow specific log for a service:
sudo journalctl -fu SERVICE
Show extended log info and print the last lines of a service:
sudo journalctl -xeu SERVICE
- I mean yeah -fu stands for "follow unit" but its also a nice coincidence when it comes to debugging that particular service.
  
  😂😂
- --vacuum-time=2days
  this implies i keep an operating system installed for that long
  
  something something nix?
- sudo journalctl --disk-usage
  undefined
  
  panda@Panda:~$ sudo journalctl --disk-usage No journal files were found. Archived and active journals take up 0B in the file system.
  hmmmmmm........
- undefined
  
  user@u9310x-Slack:~$ sudo journalctl --disk-usage Password: sudo: journalctl: command not found
  
  seems like someone doesn't like systemd :)
  
  I don't have any feelings towards particular init systems.
  
  Just curious, what distro do you use that systemd is not the default? (I at least you didn't change it after the fact if you don't have any feelings (towards unit systems ;) ) )
  
  Slackware
- Badass! Thanks!
- Thank you for this, wise sage.
  Your wisdom will be passed down the family line for generations about managing machine logs.
  
  Glad to help your family, share this wisdom with friends too ☝🏻😃
  
  Yeah, if I had dependents they'd gather round the campfire chanting these mystical runes in the husk of our fallen society
- @RemindMe@programming.dev 6 months
  
  @ategon@programming.dev is the remindme bot offline?
  
  Its semi broken currently and also functions on a whitelist with this community not being on the whitelist
  
  Ok, thanks!
- If you use OpenRC you can just delete a couple files
- Actually something I never dug into. But does logrotate no longer work? I have a bunch of disk space these days so I would not notice large log files
  
  If logrotate doesn't work, than use this as a cronjob via sudo crontab -e Put this line at the end of the file:
  0 0 * * * journalctl --vacuum-size=1G >/dev/null 2>&1
  Everyday the logs will be trimmed to 1GB. Usually the logs are trimmed automatically at 4GB, but sometimes this does not work
  
  If we're using systemd already, why not a timer?
  
  Cron is better known than a systemd timer, but you can provide an example for the timer 😃
  
  Really, the correct way would be to set the limit you want for journald. Put this into /etc/systemd/journald.conf.d/00-journal-size.conf:
  undefined
  
  [Journal] SystemMaxUse=50M
  Or something like this using a timer: systemd-run --timer-property=OnCalender=daily $COMMAND
  
  Thanks for this addition ☺️
- Why isn't it configured like that by default?
  
  It is. The defaults are a little bit more lenient, but it shouldn't gobble up 80 GB of storage.
  
  Good question, it may depend on the distro afaik

62 comments

Cleanup

How to read logs: