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
journalctl
Easy way to limit file size (stdout) on a shell script level?
You can use head for this: command | head -c 1G > /var/tmp/output.log It accepts K, M, G and the like as suffixes (bytes are the default). Append ‘B’ to use the base 10 versions.
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 when NAME=VALUE is passed as arguments. My investigations: man page From journalctl(1) The pattern is not mentioned in the description of … Read more
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 chmod g+s /var/log/journal/f9afeb75a5a382dce8269887a67fbf58
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 NOTICE and higher are highlighted; other lines are displayed normally. That’s from systemd 229. As seen in the man page, There are … Read more
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 have resolution troubles, it is a failsafe way to get all the log of a particular systemd unit invocation. To … Read more
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 directive of the [Journal] section of /etc/systemd/journald.conf is set to persistent (instead of auto or volatile). Reboot after editing the configuration file and the user will be … Read more
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-memory. You can change the default to be persistent by opening /etc/systemd/journald.conf and changing the Storage= line from auto to … Read more