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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 147 points 4 months ago

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 37 points 4 months ago

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

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

πŸ˜‚πŸ˜‚

[-] lseif@sopuli.xyz 23 points 4 months ago

--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 11 points 4 months ago* (last edited 4 months ago) 
user@u9310x-Slack:~$ sudo journalctl --disk-usage  
Password:  
sudo: journalctl: command not found
[-] DmMacniel@feddit.org 19 points 4 months ago* (last edited 4 months ago)

seems like someone doesn't like systemd :)

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

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

[-] Scipitie@lemmy.dbzer0.com 4 points 4 months ago

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 8 points 4 months ago

Badass! Thanks!

[-] Tekkip20@lemmy.world 7 points 4 months ago

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 4 points 4 months ago

Glad to help your family, share this wisdom with friends too β˜πŸ»πŸ˜ƒ

[-] 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 5 points 4 months ago

@RemindMe@programming.dev 6 months

[-] elxeno@lemm.ee 2 points 4 months ago

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

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

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

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)

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

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

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

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

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

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 2 points 4 months ago

If you use OpenRC you can just delete a couple files

[-] MonkderVierte@lemmy.ml 2 points 4 months ago

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

this post was submitted on 01 Aug 2024
661 points (100.0% liked)

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