If you update your gokrazy installations daily, as we recommend you do, logs will be cleared daily as a side effect of rebooting the device. You can use Remote Syslog to persist logs elsewhere for later analysis.
To enable remote syslog, you need to configure a target by creating the file
remote_syslog/target on the permanent data partition.
# The following assumes you already created a file system
# on the permanent data partition. Otherwise, please use:
# sudo mkfs.ext4 /dev/disk/by-partuuid/2e18c40c-04
sudo mount /dev/disk/by-partuuid/2e18c40c-04 /mnt
echo 10.0.0.76:514 | sudo tee /mnt/remote_syslog/target
sudo umount /mnt
I recommend using a (static) IP address for increased reliability, so that remote syslog works even when DNS does not.
To run a syslog server on gokrazy, check out https://github.com/gokrazy/syslogd.
If you want to run your syslog server on a regular Linux distribution, this is
how I instructed syslog-ng via its
/etc/syslog-ng/syslog-ng.conf to write syslog messages it received from
e.g. host gokrazy to /var/log/remote/gokrazy-log:
source net { network(ip(10.0.0.76) transport("udp")); };
destination remote { file("/var/log/remote/${FULLHOST}-log"); };
log { source(net); destination(remote); };