| Summary: | journalctl --directory doesn't follow rotated files properly | ||
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| Product: | systemd | Reporter: | Sebastian Schindler <sebastian.schindler+bugzilla> |
| Component: | general | Assignee: | systemd-bugs |
| Status: | NEW --- | QA Contact: | systemd-bugs |
| Severity: | normal | ||
| Priority: | medium | ||
| Version: | unspecified | ||
| Hardware: | Other | ||
| OS: | All | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: |
short example to reproduce the error
file with switched entries better example to reproduce the error better example to reproduce the error condensed version of the reproducer |
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Description
Sebastian Schindler
2015-04-27 12:48:18 UTC
Created attachment 115372 [details]
file with switched entries
Comment on attachment 115371 [details]
short example to reproduce the error
To create an example that triggers the rotation which leads to the bug I did the following steps:
-log something:
$logger a
$logger b
-save the coresponding journalentries:
$journalctl -n2 -o export >> entries.txt
-switch the timestamps and cursors of the entries (result named switched_entries.txt, see attachment)
-this will cause the journalfile to be rotated after the first entry "a" is written
-now follow a directory with journalctl
$journalctl --directory logtest/ -f
-create a new logfile with this entries:
$cat switched_entries.txt | systemd-journal-remote -o ~/logtest/a.journal -
-OUTPUT of journalctl:
No journal files were found.
Apr 27 10:07:40 virtual-fedora-sbs tpiadmin[9617]: a
-some new logging into the file:
$logger c
$journalctl -o export -n 1 | systemd-journal-remote -o ~/logtest/a.journal -
-leads to no new output, however:
-some logging into a new file in the same directory
$logger a2
$journalctl -o export -n 1 | systemd-journal-remote -o ~/logtest/b.journal -
-OUTPUT:
No journal files were found.
Apr 27 10:07:40 virtual-fedora-sbs tpiadmin[9617]: a
Apr 27 14:39:57 virtual-fedora-sbs tpiadmin[11424]: a2
//only the last line is actually new
-this new file will be followed until it gets rotated
-this problem also occurs, if the file gets rotated for other reasons than this "errors", for example if simply a rotation due to size happens
-some weird interaction I noticed: If the logs are put into the journal file two times:
$ journalctl -o export -n 1 | systemd-journal-remote -o ~/logtest/b.journal -
$ journalctl -o export -n 1 | systemd-journal-remote -o ~/logtest/b.journal -
-then the output of this doubled input is shown once, however the file isn't properly followed after that (new entries won't show up)
Created attachment 115373 [details]
better example to reproduce the error
Created attachment 115374 [details]
better example to reproduce the error
What backing file system is this? Everything described was tested on ext4. Created attachment 116042 [details]
condensed version of the reproducer
I rewrote the reproducer for clarity, now it should be easier to see the bug "in action".
I should add that I used the (back then latest) systemd version 219.
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