/var/log/

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• /var/log/kern.log
• /var/log/auth.log
• /var/log/dmesg Not in Ubuntu
• /var/log/syslog
• /var/log/mysql/error.log (MariaDB)

/var/log/postgresql

See also

• FHS, /proc/, /proc/net/, /boot/, /run/, /dev/, /usr/, /var/run/, /etc/, /var/, /var/lib/ /var/log/, /var/www/, /opt/, /lib/, /sys/, /proc/kcore, /proc/sys/, /proc/sys/vm/, /snap/, /mnt/, /mnt/data, /var/opt/, /usr/bin/, /lib/, /proc/$PID/, /proc/self/
• Linux Logging: logger systemd-cat journalctl, syslog, rsyslogd logrotate, sshd logs, Logwatch, logcheck, Container logging, Journalctl logs, journald.conf, Docker logs, ts