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add short note about persistent logs

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Daniel Barlow 2024-12-18 23:08:28 +00:00
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doc/admin.rst
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@ -131,6 +131,26 @@ human-readable format, use :command:`s6-tai64nlocal`.
1970-01-02 21:51:48.832588765 wan.link.pppoe sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x667a9594> <pcomp> <accom 1970-01-02 21:51:48.832588765 wan.link.pppoe sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x667a9594> <pcomp> <accom
p>] p>]
Log persistence
---------------
Logs written to :file:`/run/log/` will not survive a reboot or crash,
as it is an ephemeral filesystem.
On supported hardware you can enable logging to `pstore
<https://www.kernel.org/doc/Documentation/ABI/testing/pstore>` which
means the most recent log messages will be preserved on reboot.
Set the config option ``logging.persistent.enable = true``, log messages will be written to :file:/dev/pmsg0. After rebooting,
.. code-block:: console
# mount -t pstore pstore /sys/fs/pstore/
# ls -l /sys/fs/pstore/
-r--r--r-- 1 43071 pmsg-ramoops-0
# cat /sys/fs/pstore/pmsg-ramoops-0
@40000000000000282c997d29 mydevice klogd <6>[ 30.793756] int: port 2(wlan0) entered blocking state
[log messages from before the reboot follow]
Updating an installed system (JFFS2) Updating an installed system (JFFS2)