On Ubuntu 15.04 the ufw action was not working.
- With empty <application>, receiving errors:
2015-04-24 16:28:35,204 fail2ban.filter [8527]: INFO [sshd] Found 43.255.190.157
2015-04-24 16:28:35,695 fail2ban.actions [8527]: NOTICE [sshd] Ban 43.255.190.157
2015-04-24 16:28:35,802 fail2ban.action [8527]: ERROR [ -n "" ] && app="app " -- stdout: b''
2015-04-24 16:28:35,803 fail2ban.action [8527]: ERROR [ -n "" ] && app="app " -- stderr: b''
2015-04-24 16:28:35,803 fail2ban.action [8527]: ERROR [ -n "" ] && app="app " -- returned 1
- With action = ufw[application=OpenSSH], it was silently not doing
anything (no errors after "Ban x.x.x.x", but no IP addresses in ufw
status).
Re-arranged the bash commands on two lines, and it works with or without
<application>.