====== syslog ======
//**/var/log/syslog**//

====== rsyslog ======
//**rsyslog**//


cat /etc/rsyslog.conf 

ls /etc/rsyslog.d/
  20-ufw.conf  21-cloudinit.conf  50-default.conf



//**logger**//

ls /etc/logrotate.d/
  alternatives  apport  apt  dpkg  lxd  rsyslog  ufw  unattended-upgrades
cat /etc/logrotate.conf

cat /etc/cron.daily/logrotate 


aureport

====== systemd-journald ======
//**journalctl**//

journalctl --dmesg

journalctl -u unit

journalctl -u crond --since yesterday --until 9:00 -p info 


cat /etc/systemd/journald.conf 

systemctl start systemd-journald