[systemd-devel] --Reboot-- lines in journal

[Lennart Poettering]

On Do, 14.05.20 16:11, Dave Howorth (systemd at howorth.org.uk) wrote:

>
> I've never even heard of a _BOOT_ID before, so it seems I'll need to do
> some reading to answer my original questions. Where's a good place to
> start?

The _BOOT_ID is simply random ID associated with every boot by the
kernel. i.e. the stuff exposed by the kernel in
/proc/sys/kernel/random/boot_id.

The journal implicitly attaches the data from that file to each log
line in the _BOOT_ID field. See systemd.journal-fields(7).


Lennart

--
Lennart Poettering, Berlin