Public bug reported:
Using
Ubuntu 16.04.4 LTS
and
Package: systemd
Architecture: amd64
Version: 229-4ubuntu21.10
Multi-Arch: foreign
Priority: required
Section: admin
Origin: Ubuntu
The journalctl(1) command cannot be used in a systemd OnFailure service
to get error logs. To replicate the issue
1) Create a service unit
[Unit]
Description=%n
[Service]
#ExecStart=/bin/sh -xv -c 'systemctl --user status <your unit> -o cat -n 20 |
mail -s "Unit failed" <your email address>'
ExecStart=/bin/sh -c 'journalctl --user-unit=<your unit> -o verbose -q -n 20 |
mail -s "Unit failed" <your email address>'
2) enable the unit
3) start the unit
You will get a failure message from journalctl and mail of
sh[28225]: No journal files were opened due to insufficient permissions.
sh[28225]: mail: Null message body; hope that's ok
4) switch the comment # to the journalctl ExecStart and uncomment the
systemctl ExecStart line
>From systemctl you will get journal output in the email.
The man page for systemctl states "In addition, journalctl --unit=NAME
or journalctl --user-unit=NAME use a similar filter for messages and
might be more convenient." and indeed it would if it worked properly.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1810351
Title:
journalctl fails to work inside systemd service
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