Questions about journalctl - the tool used to manage, query and view logs on systemd setups.
Questions tagged [journalctl]
145 questions
111
votes
5 answers
How to see the latest x lines from systemctl service log
I'm looking for a way, to simply print the last X lines from a systemctl service in Debian. I would like to install this code into a script, which uses the printed and latest log entries. I've found this post but I wasn't able to modify it for my…
user3191334
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85
votes
5 answers
Combining tail && journalctl
I'm tailing logs of my own app and postgres.
tail -f /tmp/myapp.log /var/log/postgresql/postgresql.main.log
I need to include pgpool's logs. It used to be syslog but now it is in journalctl.
Is there a way to tie tail -f && journalctl -f together?
bikey
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31
votes
1 answer
What is the difference between dmesg and journalctl
I am completely new to Linux.
I know that dmesg and journalctl record commands invoked by my operating-system, but why do 2 recorders exist, what types of messages should I expect to see within each of them, and what are the differences in their…
Rimski
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29
votes
2 answers
How do you go to the end of the file in journalctl?
If I type sudo journalctl I get the system journal in some kind of a reader. Pressing j and k works like in Vi but G does not go to the end of the file. In fact, if press G, the stream freezes and I have forcibly terminate it.
No mention of using…
Tyler Durden
- 5,411
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27
votes
2 answers
How to watch output from systemd service?
I want to watch output from a systemd service on CentOS as if I have started this service from console. Yes, I can see output with journalctl, but it doesn't scroll to the bottom automatically. So how can I watch live output from service?
stiv
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19
votes
1 answer
Why does journalctl say "-- no entries --"?
For example:
┌─[10:50:38/hypership/root/~]
└─╼ journalctl -b
No journal files were found.
-- No entries --
┌─[10:50:46/hypership/root/~]
└─╼ journalctl --verify
No journal files were found.
/var/log is full of files though, and this was working…
trusktr
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13
votes
2 answers
Remove single line from journalctl file
I have an Ubuntu 18.04 server that is running a service I'm developing. The output is being sent to the system journal for logging.
I accidentally failed to sanitize some logging and a plaintext password (for my own user) was accidentally leaked in…
Ashoat
- 231
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11
votes
2 answers
Where to find the log file of specific service
Using sudo journalctl -u {service} I can see the log of specific service.
How to find the associated log file?
What is the best way to monitor a log file programmatically? (I mean a program the react based on something appears in the log file)
pouya
- 213
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10
votes
2 answers
Arch linux randomly freezes after updating to kernel 5.10
last three days I am experiencing random freezes. If i am looking on youtube when this happens Audio keeps playing but screen is froze and keyboard or cursor do not do anything.
I trying to look in sudo journalctl and this is what I found:
led 04…
Jan Černý
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10
votes
2 answers
How to configure journald to discard entries older than a certain time span
From the documentation I know that I can configure
the time after which journal files are deleted via MaxRetentionSec.
the time after which journal files are rotated via MaxFileSec.
However my goal is to configure journald in a way such that all…
Richard Neumann
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9
votes
1 answer
Getting systemd service logs faster from my service
I'm having a systemd service defined as follows, that works fine:
[Unit]
Description=my…
adamczi
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9
votes
2 answers
Print only timestamp and message in journalctl
I'm trying to get the last few lines from journalctl so I can feed them into my conky. However journalctl by default provides too much crap that wastes space: With journalctl -u PROCESS -n 5 --no-pager -l I get entries like:
DATE TIME HOSTNAME…
Bagalaw
- 835
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8
votes
2 answers
Show journal logs from the time a service was restarted
Is there a canonical way to get all the logs from journalctl since a service was last restarted? What I want to do is restart a service and immediately see all the logs since I initiated the restart.
I came up with:
$ unit=prometheus
$ sudo…
sdht0
- 183
- 4
8
votes
1 answer
gnome-shell error log
Where can I find gnome-shell error (or debug) log?
I'm interested in mutter error/warning messages since I have a GLX problem I need to debug and I believe the key could be in gnome-shell's messages.
Dean
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8
votes
1 answer
How does journalctl sign the logs if the "The verification key should be stored externally."?
$ man journalctl
...
--setup-keys
Instead of showing journal contents, generate a new key pair for Forward Secure Sealing (FSS). This will generate a
sealing key and a verification key. The sealing key is stored in the journal data directory and…
Marina Ala
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