sudo fail2ban-client get dbfile
Current database file is: `- /var/lib/fail2ban/fail2ban.sqlite3
2. stop the fail2ban service:
sudo service fail2ban stop
3. delete the fail2ban database file:
sudo rm /var/lib/fail2ban/fail2ban.sqlite3
4. start the fail2ban service:
sudo service fail2ban start
5. check the list of all packet filter rules in the Linux kernel:
sudo iptables -L
