Restart fail2ban after ferm restart

[timdiels]

After a ferm restart, the fail2ban iptables rules are not restored. There is already some code to reload fail2ban after a ferm restart but that doesn't seem to work. fail2ban-client reload/restart and systemctl reload fail2ban do not restore its iptables rules after a ferm restart; but systemctl restart fail2ban does.

$ sudo systemctl restart ferm
$ sudo iptables-save | grep fail2ban
$ sudo fail2ban-client reload
2023-12-28 18:46:07,716 fail2ban.configreader   [16590]: WARNING 'allowipv6' not defined in 'Definition'. Using default one: 'auto'
OK
$ sudo iptables-save | grep fail2ban
$ sudo fail2ban-client restart
Shutdown successful
2023-12-28 18:46:20,581 fail2ban.configreader   [16597]: WARNING 'allowipv6' not defined in 'Definition'. Using default one: 'auto'
Server ready
$ sudo iptables-save | grep fail2ban
$ sudo systemctl reload fail2ban
$ sudo iptables-save | grep fail2ban
$ sudo systemctl restart fail2ban
$ sudo iptables-save | grep fail2ban
-A INPUT -m recent --update --seconds 7200 --name fail2ban-sshd --mask 255.255.255.255 --rsource -j REJECT --reject-with icmp-admin-prohibited

I am assuming the host is using systemd, however. Not sure if that's a problem, but this fixes it for me.