47
votes
journalctl: how to display colors in its output?
If the original daemon output is already colorized, but the colors are being lost when using journalctl, the --output cat option will restore them. See the manual for more details.
- 583
32
votes
Accepted
Is there a way to make journalctl show logs from "the last time foo.service ran"?
Since systemd version 232, we have the concept of invocation ID. Each time a unit is ran, it has a unique 128 bit invocation ID. Unlike MainPID which can be recycled, or ActiveEnterTimestamp which can ...
- 526
30
votes
Accepted
How to allow a user to use journalctl to see user-specific systemd service logs?
On older systemd versions, you'll have to use journalctl --user --user-unit=SERVICENAME (on newer versions journalctl --user -u SERVICENAME will work fine).
However, this only works if the Storage ...
- 416
29
votes
How do view older journalctl logs (after a rotation maybe?)
It could be because you are trying to review the journal since the last boot, which seems likely to be the case inside a docker image.
On Ubuntu 16.04, the journal storage defaults to being in-...
- 3,999
26
votes
Accepted
How do view older journalctl logs (after a rotation maybe?)
The reason this happens is because of defaults on the size of journald files stored. There is more detail about this in the docs. It's worth reading the whole section I have linked to, but the ...
- 951
17
votes
journalctl: how to display colors in its output?
Install ccze, then use it like this:
journalctl -b -k -f | ccze [-A] [-o nolookups]
explanation:
-A, --raw-ansi
If one wants to enable raw ANSI color sequences instead of using curses, ...
- 171
14
votes
Is there a way to make journalctl show logs from "the last time foo.service ran"?
I'm not sure which timestamp makes the most sense but this works for me. Hopefully there is a better way of working with the timestamps from systemctl show than awk - could not figure out how to ...
- 141
14
votes
systemd's journalctl: how to filter by message?
Since systemctl --version version 237 there might be grep pattern support with -g/--grep switch, but it has to be compiled with PRCE2 support (it doesn't appear to be included in Debian Buster, >=...
- 2,213
13
votes
Accepted
How to filter journalctl output by process name?
Just figured this out. You can use any systemd journal field as filter by specifying <FIELD_NAME>=<VALUE>.
The following fields are useful for this question:
_COMM=, _EXE=, _CMDLINE=
...
11
votes
Accepted
journalctl: how to display colors in its output?
The color support of journalctl is documented in man journalctl:
When outputting to a tty, lines are colored according to priority: lines of level ERROR and higher are colored red; lines of level ...
- 3,999
11
votes
Can Journalctl and syslog be used in paralled?
The link(s) between journald and rsyslog is controlled on the rsyslog side through the use of its input and output modules; there is an imjournal and omjournal for reading from and writing to the ...
- 4,771
10
votes
Accepted
systemd's journalctl: how to filter by message?
Currently, journalctl does not support patterns or wildcards in field matches. grep is your best option.
I had the same problem, and I think that journalctl only searches for an exact match for VALUE ...
10
votes
reliable export of journalctl logs
You can install a syslog daemon such as rsyslog (the default on Red Hat derived systems). This will log all journal entries in a more backward compatible manner, and of course you can specify a custom ...
- 248k
7
votes
Accepted
How to display syslog priority level in systemd's journalctl
The following output options display priority (and facility), but in a different format:
journalctl -o verbose
journalctl -o json (and json-pretty)
journalctl -o export
- 581
7
votes
Accepted
journalctl access for non-root users
The solution is to change group ownership and add a sticky bit to the parent folder before the .journal files are created.
chown :systemd-journal /var/log/journal/f9afeb75a5a382dce8269887a67fbf58
...
- 241
7
votes
Accepted
systemd-journald Doesn't start at all
After renaming the hostname, deleting & recreating /etc/machine-id by running systemd-machine-id-setup and rebooting to apply these, systemd-journald came back to life!
- 241
7
votes
journalctl: how to display colors in its output?
I use ccze for all the logs.
Example for jornalctl with color.
journalctl -b -k -f | ccze
journalctl -b -k -f | ccze -A
Other examples.
tail -f /etc/nginx/logs/access.log | ccze
tail -f /etc/...
- 81
7
votes
journalctl: how to display colors in its output?
Seeking long for the answer, I actually figured out what works for me (with Rails logs and journalctl) – just add --all option.
journalctl -u puma --all
From manpage:
-a, --all
Show all ...
- 171
6
votes
Accepted
Truncated/missing logs with systemd on Ubuntu 16.04
This is happening probably because of rate limiting in journalctl conf. Check RateLimitInterval and RateLimitBurst in /etc/systemd/journald.conf file.
5
votes
Is there a way to make journalctl show logs from "the last time foo.service ran"?
You can use field filters with Journalctl. E.g.
journalctl _PID=1234
Get a list of all the available fields using:
journalctl --fields --unit kubelet
One available field is _PID.
You can get the ...
- 151
5
votes
Is there a way to make journalctl show logs from "the last time foo.service ran"?
These might help you:
journalctl -u foo.service | tail -n 2
or replace 2 with expected number of lines
journalctl -u foo.service --since='2016-04-11 13:00:00'
You can as well combine them to get ...
- 116
5
votes
Is there a way to make journalctl show logs from "the last time foo.service ran"?
You can use the boot flag to fetch only the logs from that boot. for instance
journalctl _SYSTEMD_UNIT=avahi-daemon.service -b 5
- 2,032
5
votes
journalctl access for non-root users
Well, I am not running Centos 7, but found this issue. I did these steps, but did not help, at least on Ubuntu 18.04 I got a message that
Hint: You are currently not seeing messages from other users ...
- 161
5
votes
Why there is no journalctl in my centos 6.6 box and how to install/enable it?
There is no journalctl in CentOS 6 because it's too old.
CentOS 6 was released in 2010, and systemd was first released in 2011.
You can find system logs in various files in the /var/log directory. ...
- 248k
4
votes
How can I output logs to a file from the content of a service with systemd
I encountered a similar issue. As explained here, it turns out that you can't redirect output directly within ExecStartPre, ExecStart, or ExecStopPost commands - systemd will interpret the > or >...
- 153
4
votes
journald: extract part of a system journal into the journald format (i.e. for use with journalctl)
You can use systemd-journal-remote to convert like this
journalctl -S @1500253701 -U @1500256701 -o export > foo.export
systemd-journal-remote --output=foo.journald foo.export
journalctl --file=...
- 41
4
votes
Volume of Logs created by journalctl/systemd per day?
My question to journalctl in human language: "Dear journalctl, how many bytes of logs did you create during the last 24 hours?"
Typically the manual is much better at providing answers in human ...
- 80.3k
4
votes
Accepted
View auditd logs in journalctl
I did not find any matches there either. Then I did this journalctl _TRANSPORT=syslog and found that I did have matches. This led me to some investigation and I found that if I filtered for ...
3
votes
Accepted
No error message in journactl of custom service
Introduction
Your original question pertains to how you can get more output from systemd.
Have a look at How to debug systemd unit ExecStart
But let's see if we can not get your service working ...
- 382
3
votes
View unbuffered log output from journalctl
Maybe it is a pipe between your daemon and systemd used for logging which is buffered? Possibly this is a duplicate of Output of a python script running as unit is out of order while shells seems ...
- 277
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