- stop logging until reboot
service rsyslog stop

 - prevent logging from start
systemctl disable rsyslog

 - enable logging again (next boot)
systemctl enable rsyslog


renew logs:
rm -vf /var/log/app*
echo new LOG from "$(date)" > /var/log/apport.log
rm -vf /var/log/altern*
echo new LOG from "$(date)" > /var/log/alternatives.log
rm -vf /var/log/auth*
echo new LOG from "$(date)" > /var/log/auth.log
rm -vf /var/log/boot*
echo new LOG from "$(date)" > /var/log/boot.log
rm -vf /var/log/dpkg*
echo new LOG from "$(date)" > /var/log/dpkg.log
rm -vf /var/log/kern*
echo new LOG from "$(date)" > /var/log/kern.log
rm -vf /var/log/mail*
echo new LOG from "$(date)" > /var/log/mail.log
echo new LOG from "$(date)" > /var/log/mail.err
rm -vf /var/log/php7*
echo new LOG from "$(date)" > /var/log/php7.4-fpm.log
rm -vf /var/log/openv*
echo new LOG from "$(date)" > /var/log/openvpnas.log
rm -vf /var/log/ufw*
echo new LOG from "$(date)" > /var/log/ufw.log
rm -vf /var/log/ubuntu-advantage-timer*
echo new LOG from "$(date)" > /var/log/ubuntu-advantage-timer.log
rm -vf /var/log/ubuntu-advantage.*
echo new LOG from "$(date)" > /var/log/ubuntu-advantage.log
rm -vf /var/log/vbox-setup*
echo new LOG from "$(date)" > /var/log/vbox-setup.log


rm -vf /var/log/btm*
echo new LOG from "$(date)" > /var/log/btmp
rm -vf /var/log/wtm*
echo new LOG from "$(date)" > /var/log/wtmp
rm -vf /var/log/faill*
echo new LOG from "$(date)" > /var/log/faillog
rm -vf /var/log/sysl*
echo new LOG from "$(date)" > /var/log/syslog
rm -vf /var/log/lastl*
echo new LOG from "$(date)" > /var/log/lastlog

rm -vf /var/log/apt/hist*
echo new LOG from "$(date)" > /var/log/apt/history.log
rm -vf /var/log/apt/term*
echo new LOG from "$(date)" > /var/log/apt/term.log
rm -vf /var/log/nginx/acce*
echo new LOG from "$(date)" > /var/log/nginx/access.log
rm -vf /var/log/nginx/error*
echo new LOG from "$(date)" > /var/log/nginx/error.log
rm -vf /var/log/mysql/contr*
echo new LOG from "$(date)" > /var/log/mysql/error.log
rm -vf /var/log/proftpd/contr*
echo new LOG from "$(date)" > /var/log/proftpd/controls.log
rm -vf /var/log/proftpd/prof*
echo new LOG from "$(date)" > /var/log/proftpd/proftpd.log
rm -vf /var/log/proftpd/xfer*
echo new LOG from "$(date)" > /var/log/proftpd/xferlog
rm -vf /var/log/dbconfig-common/dbc*
echo new LOG from "$(date)" > /var/log/dbconfig-common/dbc.log