[yocto] journald logs "lost" between firmware updates

[Jeremy Overesch]

In my embedded system, I've created persistent storage on a separate filesystem for log files in /var/log.  This works well, until I do a firmware update.  When the firmware is updated, the entire root filesystem is rewritten.  This means that the /etc/machine-id is also rewritten to a new, random number.  As journald stores everything in /var/log/journal/<machine-id>, I get old logs that are no longer accessible and not purged, taking up disk space.  Is there any way to make the machine-id persistent across firmware updates?

My initial thought would be to make /etc/machine-id into a symlink pointing to /var/log/machine-id.  However, that results in a new problem.  On first boot, the file wouldn't exist, making an invalid symlink.

What is the proper way to go about keeping the machine-id consistent across firmware updates?

Thanks,
Jeremy


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