this post was submitted on 01 Aug 2024
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    Remember to not to forget clearing your journal (lemmy.world)
    submitted 4 months ago by bali10050@lemmy.world to c/linuxmemes@lemmy.world
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    [–] morethanevil@lemmy.fedifriends.social 152 points 4 months ago (10 children)

    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

    [–] DmMacniel@feddit.org 38 points 4 months ago (1 children)

    I mean yeah -fu stands for "follow unit" but its also a nice coincidence when it comes to debugging that particular service.

    [–] lseif@sopuli.xyz 24 points 4 months ago (1 children)

    --vacuum-time=2days

    this implies i keep an operating system installed for that long

    [–] jbk@discuss.tchncs.de 9 points 4 months ago

    something something nix?

    [–] slazer2au@lemmy.world 19 points 4 months ago

    sudo journalctl --disk-usage

    panda@Panda:~$ sudo journalctl --disk-usage  
No journal files were found.  
Archived and active journals take up 0B in the file system.

    hmmmmmm........

    [–] superkret@feddit.org 12 points 4 months ago* (last edited 4 months ago) (1 children) 
    user@u9310x-Slack:~$ sudo journalctl --disk-usage  
Password:  
sudo: journalctl: command not found
    [–] DmMacniel@feddit.org 20 points 4 months ago* (last edited 4 months ago) (1 children)

    seems like someone doesn't like systemd :)

    [–] superkret@feddit.org 5 points 4 months ago (1 children)

    I don't have any feelings towards particular init systems.

    [–] Scipitie@lemmy.dbzer0.com 4 points 4 months ago (1 children)

    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 ;) ) )

    [–] superkret@feddit.org 5 points 4 months ago

    Slackware

    [–] kralk@lemm.ee 9 points 4 months ago

    Badass! Thanks!

    [–] Tekkip20@lemmy.world 8 points 4 months ago (2 children)

    Thank you for this, wise sage.

    Your wisdom will be passed down the family line for generations about managing machine logs.

    [–] morethanevil@lemmy.fedifriends.social 5 points 4 months ago

    Glad to help your family, share this wisdom with friends too ☝🏻😃

    [–] VirtualOdour@sh.itjust.works 2 points 4 months ago

    Yeah, if I had dependents they'd gather round the campfire chanting these mystical runes in the husk of our fallen society

    [–] elxeno@lemm.ee 6 points 4 months ago (1 children)

    @RemindMe@programming.dev 6 months

    [–] elxeno@lemm.ee 2 points 4 months ago (1 children)

    @ategon@programming.dev is the remindme bot offline?

    [–] Ategon@programming.dev 3 points 4 months ago* (last edited 4 months ago) (1 children)

    Its semi broken currently and also functions on a whitelist with this community not being on the whitelist

    [–] elxeno@lemm.ee 1 points 4 months ago

    Ok, thanks!

    [–] Pacmanlives@lemmy.world 3 points 4 months ago (1 children)

    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

    [–] morethanevil@lemmy.fedifriends.social 2 points 4 months ago* (last edited 4 months ago) (1 children)

    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

    [–] fallingcats@discuss.tchncs.de 5 points 4 months ago (1 children)

    If we're using systemd already, why not a timer?

    [–] morethanevil@lemmy.fedifriends.social 3 points 4 months ago (1 children)

    Cron is better known than a systemd timer, but you can provide an example for the timer 😃

    [–] fallingcats@discuss.tchncs.de 5 points 4 months ago* (last edited 4 months ago) (1 children)

    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:

    [Journal]
SystemMaxUse=50M

    Or something like this using a timer: systemd-run --timer-property=OnCalender=daily $COMMAND

    [–] morethanevil@lemmy.fedifriends.social 3 points 4 months ago

    Thanks for this addition ☺️

    [–] rambling_lunatic@sh.itjust.works 3 points 4 months ago

    If you use OpenRC you can just delete a couple files

    [–] MonkderVierte@lemmy.ml 2 points 4 months ago (2 children)

    Why isn't it configured like that by default?

    [–] faerbit@sh.itjust.works 5 points 4 months ago

    It is. The defaults are a little bit more lenient, but it shouldn't gobble up 80 GB of storage.

    [–] morethanevil@lemmy.fedifriends.social 2 points 4 months ago

    Good question, it may depend on the distro afaik