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Turn on debug logging in Fail2ban

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Turn on debug logging in Fail2ban
- Log File

To turn on debug mode in Fail2ban, please set its log level to debug in config file /etc/fail2ban/fail2ban.local, then restart fail2ban service. If file /etc/fail2ban/fail2ban.local doesn't exist, use /etc/fail2ban/fail2ban.conf instead.

loglevel = DEBUG

Log File

Fail2ban may log to different log files on different Linux/BSD distributions:

/var/log/fail2ban.log
/var/log/fail2ban/fail2ban.log
/var/log/messages
/var/log/syslog