[systemd-devel] Q: "systemd-journald: ... /system.journal: Journal file uses a different sequence number ID, rotating."

[Windl, Ulrich]

Hi!

When upgrading SLES 15 from SP5 to SP6 also involved updating systemd (from 249 to 254):
On first boot I noticed the message "systemd-journald[673]: /var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system.journal: Journal file uses a different sequence number ID, rotating."
That was kind of expected as the journal offers new features.
However I see the same message on every boot since then.
I suspect that journald sees some old journal log, so it wants to rotate; however shouldn't it see the newer journal log also?

For example I see (long lines!):
# ll /var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/
total 262704
-rw-r-----  1 root systemd-journal  8388608 Feb  7 06:52 system.journal
-rw-r-----  1 root systemd-journal 16777216 Jan 13 10:38 system at 00062b93337b03e5-baeac75ab8ece274.journal~
-rw-r-----  1 root systemd-journal  4942048 Jan 31 13:49 system at 04b261267cd54c5cb6dfecc7cffb066f-000000000001686a-00062cffc7cf6f2c.journal
-rw-r-----  1 root root            16777216 May 23  2024 system at 801d8a4e11874bf4a840568e7b18e203-0000000000000001-000616af9b034887.journal
-rw-r-----  1 root root            16777216 Jun 22  2024 system at 801d8a4e11874bf4a840568e7b18e203-0000000000002305-000619149353abe6.journal
-rw-r-----  1 root systemd-journal 16777216 Jul 23  2024 system at 801d8a4e11874bf4a840568e7b18e203-0000000000003e97-00061b794ae8fbda.journal
-rw-r-----  1 root systemd-journal 16777216 Aug 22 12:00 system at 801d8a4e11874bf4a840568e7b18e203-00000000000068b4-00061dde013b657e.journal
-rw-r-----  1 root systemd-journal 16777216 Sep 21 23:00 system at 801d8a4e11874bf4a840568e7b18e203-0000000000008496-00062042b8d0b3ca.journal
-rw-r-----  1 root systemd-journal 16777216 Oct 22 10:00 system at 801d8a4e11874bf4a840568e7b18e203-000000000000a053-000622a77065fd9c.journal
-rw-r-----  1 root systemd-journal 16777216 Nov 21 20:00 system at 801d8a4e11874bf4a840568e7b18e203-000000000000d01f-0006250c28fc0eba.journal
-rw-r-----  1 root systemd-journal 16777216 Dec 22 07:00 system at 801d8a4e11874bf4a840568e7b18e203-000000000000ebd3-00062770e09159a9.journal
-rw-r-----  1 root systemd-journal  7322384 Jan 13 13:46 system at 801d8a4e11874bf4a840568e7b18e203-000000000001379c-00062b93337b34a1.journal
-rw-r-----  1 root systemd-journal  6144336 Feb  5 13:29 system at acfa2ef9daee47b08a5ae900ed28c6af-00000000000170b3-00062cfff78de40a.journal
-rw-r-----  1 root systemd-journal  8227976 Jan 31 13:35 system at c21d310247504551b0158fa32695cc01-0000000000014c44-00062b95d4283379.journal
-rw-r-----+ 1 root systemd-journal  8388608 Dec 22 07:05 user-10000.journal
-rw-r-----+ 1 root root             8388608 May 23  2024 user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000000850-000616c3cf9786df.journal
-rw-r-----+ 1 root root             8388608 Jun 22  2024 user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000002387-0006191fba20c991.journal
-rw-r-----+ 1 root root             8388608 Jul 23  2024 user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000003ebe-00061b7ba4acd4f4.journal
-rw-r-----+ 1 root systemd-journal  8388608 Aug 22 12:00 user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000006918-00061de62e381e7c.journal
-rw-r-----+ 1 root systemd-journal  8388608 Sep 21 23:00 user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000008572-000620563a301574.journal
-rw-r-----+ 1 root systemd-journal  8388608 Oct 22 10:00 user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-000000000000a0dc-000622b224b97898.journal
-rw-r-----+ 1 root systemd-journal  8388608 Nov 21 20:00 user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-000000000000d102-0006251f8cdc0017.journal
-rw-r-----+ 1 root systemd-journal  8388608 Dec 22 07:00 user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-000000000000ec61-0006277b77631030.journal
-rw-r-----+ 1 root systemd-journal  8388608 Oct 22 10:00 user-54321 at 3a755daa8dd2477ea12103431b20e3b0-000000000000ae9e-000623dd86431883.journal<mailto:user-54321 at 3a755daa8dd2477ea12103431b20e3b0-000000000000ae9e-000623dd86431883.journal>


Maybe I just don't understand what "rotating" really means.
# file /var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/*
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system.journal:                                                                        Journal file, online
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 00062b93337b03e5-baeac75ab8ece274.journal~:                                     Journal file, offline
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 04b261267cd54c5cb6dfecc7cffb066f-000000000001686a-00062cffc7cf6f2c.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 801d8a4e11874bf4a840568e7b18e203-0000000000000001-000616af9b034887.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 801d8a4e11874bf4a840568e7b18e203-0000000000002305-000619149353abe6.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 801d8a4e11874bf4a840568e7b18e203-0000000000003e97-00061b794ae8fbda.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 801d8a4e11874bf4a840568e7b18e203-00000000000068b4-00061dde013b657e.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 801d8a4e11874bf4a840568e7b18e203-0000000000008496-00062042b8d0b3ca.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 801d8a4e11874bf4a840568e7b18e203-000000000000a053-000622a77065fd9c.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 801d8a4e11874bf4a840568e7b18e203-000000000000d01f-0006250c28fc0eba.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 801d8a4e11874bf4a840568e7b18e203-000000000000ebd3-00062770e09159a9.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at 801d8a4e11874bf4a840568e7b18e203-000000000001379c-00062b93337b34a1.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at acfa2ef9daee47b08a5ae900ed28c6af-00000000000170b3-00062cfff78de40a.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/system at c21d310247504551b0158fa32695cc01-0000000000014c44-00062b95d4283379.journal:     Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-10000.journal:                                                                    Journal file empty, offline
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000000850-000616c3cf9786df.journal: Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000002387-0006191fba20c991.journal: Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000003ebe-00061b7ba4acd4f4.journal: Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000006918-00061de62e381e7c.journal: Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-0000000000008572-000620563a301574.journal: Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-000000000000a0dc-000622b224b97898.journal: Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-000000000000d102-0006251f8cdc0017.journal: Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-10000 at 9e6078f3ed8f422ea3b0579a74f591c7-000000000000ec61-0006277b77631030.journal: Journal file, archived
/var/log/journal/aefe6ef1acb28655ef1a2fa8610cef2b/user-54321 at 3a755daa8dd2477ea12103431b20e3b0-000000000000ae9e-000623dd86431883.journal: Journal file, archived

Kind regards,
Ulrich Windl

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