this post was submitted on 01 Aug 2024

663 points (98.5% liked)

linuxmemes

21440 readers

809 users here now

Hint: :q!

Sister communities:

Community rules (click to expand)

1. Follow the site-wide rules

Instance-wide TOS: https://legal.lemmy.world/tos/
Lemmy code of conduct: https://join-lemmy.org/docs/code_of_conduct.html

2. Be civil

Understand the difference between a joke and an insult.

Do not harrass or attack members of the community for any reason.

Leave remarks of "peasantry" to the PCMR community. If you dislike an OS/service/application, attack the thing you dislike, not the individuals who use it. Some people may not have a choice.

Bigotry will not be tolerated.

These rules are somewhat loosened when the subject is a public figure. Still, do not attack their person or incite harrassment.

3. Post Linux-related content

Including Unix and BSD.

Non-Linux content is acceptable as long as it makes a reference to Linux. For example, the poorly made mockery of sudo in Windows.

No porn. Even if you watch it on a Linux machine.

4. No recent reposts

Everybody uses Arch btw, can't quit Vim, and wants to interject for a moment. You can stop now.

Please report posts and comments that break these rules!

Important: never execute code or follow advice that you don't understand or can't verify, especially here. The word of the day is credibility. This is a meme community -- even the most helpful comments might just be shitposts that can damage your system. Be aware, be smart, don't fork-bomb your computer.

founded 1 year ago

MODERATORS

[email protected]

663

Remember to not to forget clearing your journal (lemmy.world)

submitted 3 months ago by [email protected] to c/[email protected]

62 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 152 points 3 months ago (10 children)

Cleanup

Check current disk usage:

sudo journalctl --disk-usage

Use rotate function:

sudo journalctl --rotate

Remove all logs and keep the last 2 days:

sudo journalctl --vacuum-time=2days

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

[–] [email protected] 38 points 3 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.

[–] [email protected] 4 points 3 months ago

😂😂

[–] [email protected] 24 points 3 months ago (1 children)

--vacuum-time=2days

this implies i keep an operating system installed for that long

[–] [email protected] 9 points 3 months ago

something something nix?

[–] [email protected] 19 points 3 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........

[–] [email protected] 12 points 3 months ago* (last edited 3 months ago) (1 children)

user@u9310x-Slack:~$ sudo journalctl --disk-usage  
Password:  
sudo: journalctl: command not found

[–] [email protected] 20 points 3 months ago* (last edited 3 months ago) (1 children)

seems like someone doesn't like systemd :)

[–] [email protected] 5 points 3 months ago (1 children)

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

[–] [email protected] 4 points 3 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 ;) ) )

[–] [email protected] 5 points 3 months ago

Slackware

[–] [email protected] 9 points 3 months ago

Badass! Thanks!

[–] [email protected] 8 points 3 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.

[–] [email protected] 5 points 3 months ago

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

[–] VirtualOdour 2 points 3 months ago

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

[–] [email protected] 6 points 3 months ago (1 children)

@[email protected] 6 months

[–] [email protected] 2 points 3 months ago (1 children)

@[email protected] is the remindme bot offline?

[–] [email protected] 3 points 3 months ago* (last edited 3 months ago) (1 children)

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

[–] [email protected] 1 points 3 months ago

Ok, thanks!

[–] rambling_lunatic 3 points 3 months ago

If you use OpenRC you can just delete a couple files

[–] [email protected] 3 points 3 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

[–] [email protected] 2 points 3 months ago* (last edited 3 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

[–] [email protected] 5 points 3 months ago (1 children)

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

[–] [email protected] 3 points 3 months ago (1 children)

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

[–] [email protected] 5 points 3 months ago* (last edited 3 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

[–] [email protected] 3 points 3 months ago

Thanks for this addition ☺️

[–] [email protected] 2 points 3 months ago (2 children)

Why isn't it configured like that by default?

[–] faerbit 5 points 3 months ago

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

[–] [email protected] 2 points 3 months ago

Good question, it may depend on the distro afaik